{"id":1797,"date":"2014-09-25T14:41:50","date_gmt":"2014-09-25T07:41:50","guid":{"rendered":"http:\/\/www.saigonstereo.com\/home\/?p=1797"},"modified":"2019-07-15T15:55:19","modified_gmt":"2019-07-15T08:55:19","slug":"phong-van-charles-hansen-chu-tich-hang-ayre-acoustics","status":"publish","type":"post","link":"https:\/\/www.saigonstereo.com\/home\/phong-van-charles-hansen-chu-tich-hang-ayre-acoustics\/","title":{"rendered":"Ph\u1ecfng v\u1ea5n Charles Hansen – Ch\u1ee7 t\u1ecbch h\u00e3ng Ayre Acoustics"},"content":{"rendered":"

HFVN – M\u1ed9t trong nh\u1eefng l\u1ee3i \u00edch l\u1edbn nh\u1ea5t khi l\u00e0m vi\u1ec7c trong ng\u00e0nh hi-fi \u0111\u00f3 ch\u00ednh l\u00e0 c\u00f3 c\u01a1 h\u1ed9i \u0111\u01b0\u1ee3c g\u1eb7p nh\u1eefng con ng\u01b0\u1eddi t\u00e0i n\u0103ng v\u00e0 th\u00fa v\u1ecb – nh\u1eefng nh\u00e0 thi\u1ebft k\u1ebf thi\u1ebft k\u1ebf ra c\u00e1c s\u1ea3n ph\u1ea9m mang \u0111\u1ebfn \u201cs\u1ef1 th\u1ecfa m\u00e3n \u00e2m nh\u1ea1c\u2019 cho c\u00f4ng ch\u00fang y\u00eau nh\u1ea1c. Th\u00f4ng th\u01b0\u1eddng, c\u00e1c th\u01b0\u01a1ng hi\u1ec7u audio l\u1edbn trong th\u01b0\u1eddng mang \u0111\u1eadm d\u1ea5u \u1ea5n, t\u1ea7m nh\u00ecn v\u00e0 t\u00ednh c\u00e1ch c\u1ee7a m\u1ed9t c\u00e1 nh\u00e2n n\u00e0o \u0111\u00f3. M\u1ed9t v\u00ed d\u1ee5 c\u1ee5 th\u1ec3, h\u00e3y nh\u00ecn v\u00e0o m\u1ecdi linh ki\u1ec7n, s\u1ea3n ph\u1ea9m c\u1ee7a Ayre Acoustics, b\u1ea1n s\u1ebd nh\u1eadn ra ngay \u0111\u00e2y l\u00e0 s\u1ea3n ph\u1ea9m c\u1ee7a Charles Hansen – ng\u01b0\u1eddi s\u00e1ng l\u1eadp ra Avalon, v\u00e0 hi\u1ec7n th\u1eddi l\u00e0 ch\u1ee7 t\u1ecbch Ayre Acoustics.<\/p>\n

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M\u1ed9t trong nh\u1eefng s\u1ea3n ph\u1ea9m m\u1edbi nh\u1ea5t c\u1ee7a Ayre Acoustic: Thi\u1ebft b\u1ecb gi\u1ea3i m\u00e3 ng\u01b0\u1ee3c Analog – Digital QA-9<\/p><\/div>\n

Kh\u00f4ng gi\u1ed1ng nh\u01b0 nhi\u1ec1u nh\u00e0 thi\u1ebft k\u1ebf thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed c\u1ee7a c\u00e1c h\u00e3ng kh\u00e1c c\u00f3 n\u1ec1n t\u1ea3ng l\u00e0 k\u1ef9 thu\u1eadt \u0111i\u1ec7n t\u1eed; \u00f4ng Charlie (t\u00ean th\u00e2n m\u1eadt c\u1ee7a Charles Hansen) ch\u1ec9 h\u1ecdc chuy\u00ean ng\u00e0nh V\u1eadt l\u00fd. T\u1eeb cu\u1ed9c tr\u00f2 chuy\u1ec7n \u0111\u1ea7u ti\u00ean, t\u00f4i \u0111\u00e3 h\u1ebft s\u1ee9c kinh ng\u1ea1c b\u1edfi s\u1ef1 chia s\u1ebb th\u1eb3ng th\u1eafn c\u0169ng nh\u01b0 c\u00e1ch ti\u1ebfp c\u1eadn v\u00e0 c\u00e1c tri\u1ebft l\u00fd li\u00ean quan \u0111\u1ebfn \u00e2m thanh c\u1ee7a \u00f4ng. N\u1ebfu \u00f4ng nghe c\u00e1i n\u00e0o \u0111\u00f3 th\u1ea5y hay, \u00f4ng s\u1ebd ch\u1ecdn n\u00f3 b\u1ea5t ch\u1ea5p l\u1ed1i suy x\u00e9t, \u0111o l\u01b0\u1eddng t\u00ednh to\u00e1n th\u00f4ng th\u01b0\u1eddng cho k\u1ebft qu\u1ea3 nh\u01b0 th\u1ebf n\u00e0o. Nh\u1eefng thi\u1ebft k\u1ebf c\u1ee7a \u00f4ng th\u01b0\u1eddng c\u00f3 b\u1ed9 ngu\u1ed3n \u0111\u1ed9c nh\u1ea5t v\u00f4 nh\u1ecb, m\u1ea1ch c\u00e2n b\u1eb1ng to\u00e0n ph\u1ea7n v\u1edbi thi\u1ebft k\u1ebf d\u1ea1ng r\u1eddi d\u1ec5 s\u1eed d\u1ee5ng, v\u00e0 kh\u00f4ng h\u1ed3i ti\u1ebfp \u00e2m (zero feedback). L\u1ea7n \u0111\u1ea7u t\u00f4i bi\u1ebft \u00f4ng Charlie l\u00e0 sau khi \u201cd\u00ednh\u201d v\u00e0o \u00e2mli c\u00f4ng su\u1ea5t Dreadnaught c\u1ee7a Theta, ch\u00ednh \u00f4ng Charlie \u0111\u00e3 ho\u00e0n th\u00e0nh c\u00f4ng vi\u1ec7c thi\u1ebft k\u1ebf c\u01a1 b\u1ea3n v\u00e0 t\u00f4i \u0111\u00e3 s\u1eed d\u1ee5ng \u0111\u1ec3 tham kh\u1ea3o trong hai n\u0103m r\u00f2ng. B\u00ean c\u1ea1nh nh\u1eefng pre \u00e2mli v\u00e0 \u00e2mli \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 cao c\u1ee7a Ayre Acoustics, \u0111\u1ea7u ph\u00e1t Ayre D-1x l\u00e0 m\u1ed9t trong nh\u1eefng \u0111\u1ea7u ph\u00e1t CD \/ DVD player t\u1ed1t nh\u1ea5t t\u00f4i \u0111\u00e3 t\u1eebng nghe.<\/p>\n

Ch\u00fang t\u00f4i b\u1eaft \u0111\u1ea7u cu\u1ed9c ph\u1ecfng v\u1ea5n v\u1edbi Charles Hansen n\u00e0y b\u1eb1ng c\u00e2u h\u1ecfi: Charlie, l\u00e0m th\u1ebf n\u00e0o \u00f4ng l\u1ea1i y\u00eau th\u00edch ni\u1ec1m \u0111am m\u00ea chung m\u00e0 ch\u00fang ta g\u1ecdi l\u00e0 \u201chi-fi\u201d …<\/strong><\/em><\/span><\/p>\n

Charlie:<\/strong>\u00a0T\u00f4i b\u1eaft \u0111\u1ea7u bi\u1ebft \u0111\u1ebfn v\u00e0 quanh qu\u1ea9n c\u00e1c b\u1ed9 d\u00e0n hi-fi c\u0169ng l\u00e0 khi t\u00f4i b\u1eaft \u0111\u1ea7u h\u00ecnh th\u00e0nh nh\u1eadn th\u1ee9c. Cha t\u00f4i l\u00e0 m\u1ed9t ng\u01b0\u1eddi y\u00eau \u00e2m nh\u1ea1c th\u1ef1c th\u1ee5, \u00f4ng s\u1edf h\u1eefu nh\u1eefng thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed c\u1ee7a Dyna electronics t\u1eeb nh\u1eefng n\u0103m 60. T\u1eeb nh\u1ecf, t\u00f4i \u0111\u00e3 ho\u00e0n to\u00e0n say m\u00ea b\u1edfi nh\u1eefng h\u1ec7 th\u1ed1ng n\u00e0y, nh\u01b0ng l\u00fac \u0111\u00f3 \u00f4ng kh\u00f4ng cho t\u00f4i ch\u1ea1m v\u00e0o b\u1edfi t\u00f4i ch\u1ec9 m\u1edbi 6 tu\u1ed5i! Tuy nhi\u00ean, \u00f4ng \u0111\u00e3 d\u00e0nh cho b\u1ecdn tr\u1ebb m\u1ed9t h\u1ec7 th\u1ed1ng c\u0169 kh\u00e1c c\u1ee7a \u00f4ng; n\u00f3 bao g\u1ed3m m\u1ed9t \u00e2m li t\u00edch h\u1ee3p c\u1ee7a Eico v\u00e0 ch\u1ec9 c\u00f3 th\u1ec3 ph\u00e1t mono m\u00e0 th\u00f4i.<\/p>\n

L\u00fac l\u00ean c\u1ea5p 2, t\u00f4i \u0111\u00e3 gi\u00e0nh l\u1ea5y con Eico v\u00e0 h\u00e0ng ng\u00e0y m\u00e0y m\u00f2 n\u00f3. Th\u1eadm ch\u00ed t\u00f4i c\u00f2n kh\u00f4ng \u0111\u1ebfn l\u1edbp m\u00e0 \u0111i l\u00f2ng v\u00f2ng trong th\u01b0 vi\u1ec7n tr\u01b0\u1eddng, \u0111\u1ecdc nh\u1eefng cu\u1ed1n s\u00e1ch nh\u01b0 \u201cC\u00e1c y\u1ebfu t\u1ed1 v\u00f4 tuy\u1ebfn\u201d c\u1ee7a Abraham Marcus v\u00e0 William Marcus. N\u1ebfu b\u1ea1n v\u1eabn c\u00f3 th\u1ec3 t\u00ecm th\u1ea5y th\u00ec \u0111\u00e2y qu\u1ea3 l\u00e0 1 cu\u1ed1n s\u00e1ch nh\u1eadp m\u00f4n tuy\u1ec7t v\u1eddi. \u0110\u00f3 l\u00e0 l\u00fd do khi t\u00f4i b\u1eaft \u0111\u1ea7u h\u1ecdc c\u1ea5p 3, t\u00f4i \u0111\u00e3 \u0111\u1ebfn l\u00e0m vi\u1ec7c \u1edf b\u1ed9 ph\u1eadn s\u1eeda ch\u1eefa 1 c\u1eeda h\u00e0ng thi\u1ebft b\u1ecb \u00e2m thanh trong v\u00f9ng.T\u00f4i c\u00f2n qu\u00e1 nh\u1ecf \u0111\u1ec3 l\u00e1i xe n\u00ean ph\u1ea3i \u0111i nh\u1edd xe \u0111\u1ebfn \u0111\u00f3. H\u1ed3i \u0111\u1ea7u, c\u1eeda h\u00e0ng c\u00f3 McIntosh v\u00e0 JBL, v\u00e0 khi hi-end ra \u0111\u1eddi ch\u00fang t\u00f4i c\u00f3 Magneplanar, Linn v\u00e0 Levinson. Nh\u00f3m ch\u00fang t\u00f4i th\u1ef1c s\u1ef1 \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111\u01b0a \u0111\u1ebfn ch\u00e2n tr\u1eddi m\u1edbi khi ch\u1ee9ng ki\u1ebfn nh\u1eefng d\u00f2ng thi\u1ebft b\u1ecb hi-end bi\u1ec3u di\u1ec5n. Ch\u00fang t\u00f4i \u0111\u00e3 d\u00e0nh r\u1ea5t nhi\u1ec1u th\u1eddi gian nghe nh\u1ea1c v\u00e0 t\u1ef1 l\u00ean c\u00e1c l\u00ean c\u00e1c k\u1ebf h\u1ecdach cho t\u01b0\u01a1ng lai. (Tommy Thompson v\u00e0 Charles Roe, n\u1ebfu 2 anh b\u1ea1n \u1edf \u0111\u00e2u \u0111\u00f3 c\u00f3 nghe th\u1ea5y th\u00ec h\u00fa 1 ti\u1ebfng nh\u00e9!)<\/p>\n

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DX-5 – \u0110\u1ea7u ph\u00e1t \u0111a \u0111\u1ecbnh d\u1ea1ng \u0111\u1ea7u b\u1ea3ng hi\u1ec7n nay c\u1ee7a Ayre Acoustics<\/p><\/div>\n

Ph\u00f3ng vi\u00ean: Sau \u0111\u00f3, \u00f4ng \u0111\u00e3 h\u1ecdc chuy\u00ean ng\u00e0nh v\u1eadt l\u00fd \u1edf tr\u01b0\u1eddng \u0111\u1ea1i h\u1ecdc \u01b0?<\/strong><\/em><\/span><\/p>\n

Charlie:<\/strong>\u00a0H\u1ecdc v\u1eadt l\u00fd l\u00e0 1 chuy\u1ec7n t\u1ed1t v\u00e0 c\u0169ng l\u00e0 1 chuy\u1ec7n x\u1ea5u. M\u1ed9t m\u1eb7t, t\u00f4i h\u1ecdc \u0111\u01b0\u1ee3c nh\u1eefng nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n v\u1ec1 s\u1ef1 v\u1eadt v\u00e0 l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 ph\u00e2n t\u00edch ch\u00fang ch\u00ednh x\u00e1c. M\u1eb7t kh\u00e1c, ch\u00fang t\u00f4i kh\u00f4ng th\u1ef1c s\u1ef1 bi\u1ebft nhi\u1ec1u v\u1ec1 c\u00e1ch v\u0169 tr\u1ee5 h\u1ecdat \u0111\u1ed9ng. Ch\u00fang t\u00f4i c\u00f3 ph\u01b0\u01a1ng tr\u00ecnh m\u00f4 t\u1ea3 l\u1ef1c h\u1ea5p d\u1eabn, v\u00e0 c\u00f3 th\u1ec3 d\u1ef1 \u0111o\u00e1n \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a c\u00e1c v\u1eadt th\u1ec3 v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c, x\u00e1c su\u1ea5t \u0111\u00e1ng kinh ng\u1ea1c, nh\u01b0ng kh\u00f4ng ai bi\u1ebft l\u1ef1c h\u1ea5p d\u1eabn th\u1ef1c s\u1ef1 l\u00e0 g\u00ec ho\u1eb7c th\u1ef1c s\u1ef1 t\u00e1c \u0111\u1ed9ng ra l\u00e0m sao. \u1ede khoa V\u1eadt l\u00ed, r\u1ea5t d\u1ec5 d\u00e0ng b\u1ecb nhi\u1ec5m th\u00f3i ki\u00eau ng\u1ea1o ki\u1ec3u th\u00f4ng th\u00e1i v\u00e0 \u0111\u00f3 c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t tr\u1edf ng\u1ea1i th\u1ef1c s\u1ef1 khi n\u00f3i v\u1ec1 s\u1ef1 am hi\u1ec3u c\u00e1c thi\u1ebft b\u1ecb hi-fi. V\u00ed d\u1ee5, t\u00f4i t\u1ef1 h\u1ecfi kh\u00f4ng bi\u1ebft nhi\u1ec1u gi\u00e1o s\u01b0 V\u1eadt l\u00fd c\u00f3 ch\u1ea5p nh\u1eadn s\u1ef1 th\u1eadt r\u1eb1ng c\u00e1p t\u00edn hi\u1ec7u c\u00f3 t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn ch\u1ea5t l\u01b0\u1ee3ng \u00e2m thanh hay kh\u00f4ng!
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\nPh\u00f3ng vi\u00ean: L\u00e0m th\u1ebf n\u00e0o t\u1eeb v\u1eadt l\u00fd \u00f4ng \u0111\u00e3 tr\u1edf v\u1ec1 v\u1edbi th\u1ebf gi\u1edbi audio?<\/span><\/strong><\/em><\/p>\n

Charlie:<\/strong>\u00a0Sau khi t\u1ed1t nghi\u1ec7p, t\u00f4i \u0111\u00e3 ph\u00e1t tri\u1ec3n m\u1ed9t s\u1ed1 l\u00fd thuy\u1ebft c\u00f3 v\u1ebb \u0111\u01a1n gi\u1ea3n v\u1ec1 c\u00e1ch x\u1eed l\u00fd c\u1ee7 loa, sau \u0111\u00f3 \u0111\u00e3 t\u1ea1o ra m\u1ed9t b\u01b0\u1edbc \u0111\u1ed9t ph\u00e1 trong kh\u1ea3 n\u0103ng \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 trong su\u1ed1t v\u00e0 kh\u00f4ng b\u1ecb m\u00e9o \u00e2m t\u1eeb d\u1ea3i cao \u0111\u1ebfn d\u1ea3i th\u1ea5p. T\u00f4i th\u00e0nh l\u1eadp th\u01b0\u01a1ng hi\u1ec7u Avalon Acoustics c\u00f9ng v\u1edbi m\u1ed9t ng\u01b0\u1eddi b\u1ea1n th\u1ee3 m\u1ed9c – Bob Grupp. Ch\u00fang t\u00f4i kh\u00f4ng bi\u1ebft nhi\u1ec1u v\u1ec1 \u0111i\u1ec1u h\u00e0nh kinh doanh nh\u01b0ng may m\u1eafn khi c\u00f2n c\u00f3 m\u1ed9t s\u1ed1 nh\u00e2n s\u1ef1 ch\u1ee7 ch\u1ed1t kh\u00e1c gi\u00fap c\u00f4ng ty t\u1ed3n t\u1ea1i, trong \u0111\u00f3 c\u00f3 Richard Broida, Jeff Rowland, v\u00e0 cu\u1ed1i c\u00f9ng l\u00e0 Neil Patel. T\u00f4i \u0111\u00e3 h\u1ecdc \u0111\u01b0\u1ee3c r\u1ea5t nhi\u1ec1u v\u1ec1 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p, c\u00e1ch th\u1ee9c th\u1ea9m \u00e2m v\u00e0 th\u1eadm ch\u00ed l\u00e0 c\u1ea3 thi\u1ebft k\u1ebf t\u1eeb Neil, nh\u1eefng ki\u1ebfn th\u1ee9c n\u00e0y v\u00f4 c\u00f9ng h\u1eefu \u00edch \u0111\u1ed1i v\u1edbi t\u00f4i khi b\u1eaft \u0111\u1ea7u vai tr\u00f2 m\u1edbi: thi\u1ebft k\u1ebf \u0111i\u1ec7n t\u1eed t\u1ea1i Ayre.<\/p>\n

Ph\u00f3ng vi\u00ean: L\u00e0m th\u1ebf n\u00e0o m\u00e0 Ayre Acoustics ra \u0111\u1eddi?<\/strong><\/em><\/span><\/p>\n

Charlie:<\/strong>\u00a0T\u00f4i b\u1eaft \u0111\u1ea7u c\u00f4ng vi\u1ec7c t\u1ea1o n\u00ean Ayre Acoustics c\u00f9ng v\u1edbi m\u1ed9t v\u00e0i ng\u01b0\u1eddi b\u1ea1n: Peter Bohacek v\u00e0 Katie Lehr v\u00e0o n\u0103m 1993. M\u1ee5c ti\u00eau c\u1ee7a c\u1ee7a ch\u00fang t\u00f4i khi \u1ea5y l\u00e0 t\u00e1i hi\u1ec7n \u0111i\u1ec1u k\u1ef3 di\u1ec7u m\u00e0 ch\u00fang t\u00f4i \u0111\u00e3 th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c \u1edf Avalon nh\u01b0ng v\u1edbi 1 m\u1ee9c gi\u00e1 h\u1ee3p l\u00fd h\u01a1n. S\u1ebd th\u1eadt tuy\u1ec7t v\u1eddi khi d\u00e0n m\u00e1y c\u1ee7a b\u1ea1n tr\u00ecnh di\u1ec5n nh\u01b0 \u201cbi\u1ebft h\u00e1t\u201d th\u1ef1c s\u1ef1 v\u00e0 b\u1ea1n ch\u01a1i n\u00f3 cho nh\u1eefng ng\u01b0\u1eddi kh\u00e1c c\u00f9ng nghe. L\u00fac n\u00e0y, cho d\u00f9 l\u00e0 \u0111\u00f3 nh\u1eefng tay \u0111am m\u00ea \u00e2m thanh hay kh\u00f4ng bi\u1ebft g\u00ec c\u1ea3 th\u01b0\u1eddng s\u1ebd c\u00f3 ph\u1ea3n \u1ee9ng: “\u1ed2, t\u00f4i kh\u00f4ng ngh\u0129 1 h\u1ec7 th\u1ed1ng \u00e2m thanh c\u00f3 th\u1ec3 nghe hay nh\u01b0 th\u1ebf! T\u00f4i c\u00f3 th\u1ec3 nghe th\u1ea5y ch\u1ea5t \u00e2m nh\u1ea1c nhi\u1ec1u v\u00e0 nhi\u1ec1u h\u01a1n n\u1eefa!”. Sau \u0111\u00f3 \u0111\u00f4i khi h\u1ecd s\u1ebd h\u1ecfi gi\u00e1 bao nhi\u00eau v\u1eady, b\u1ea1n cho h\u1ecd bi\u1ebft gi\u00e1, v\u00e0 r\u1ed3i h\u1ecd b\u1ea3o “Ch\u00e0, th\u01b0\u1edfng th\u1ee9c th\u00ec tuy\u1ec7t v\u1eddi \u0111\u1ea5y nh\u01b0ng t\u00f4i kh\u00f4ng c\u00f3 kh\u1ea3 n\u0103ng mua.”<\/p>\n

Tuy r\u1ea5t tuy\u1ec7t v\u1eddi khi c\u00f3 th\u1ec3 t\u1ea1o n\u00ean 1 s\u1ea3n ph\u1ea9m n\u00e0o \u0111\u00f3 tr\u00ean c\u1ea3 tuy\u1ec7t v\u1eddi; trong qu\u00e1 tr\u00ecnh n\u00e0y, b\u1ea1n s\u1ebd h\u1ecdc h\u1ecfi \u0111\u01b0\u1ee3c r\u1ea5t nhi\u1ec1u\u00a0 th\u1ebf nh\u01b0ng l\u1ea1i ch\u1ec9 c\u00f3 m\u1ed9t v\u00e0i ng\u01b0\u1eddi may m\u1eafn c\u00f3 th\u1ec3 mua v\u00e0 t\u1eadn h\u01b0\u1edfng ch\u00fang. \u0110\u00f3 l\u00e0 l\u00fd do ch\u00fang t\u00f4i ti\u1ebfp t\u1ee5c t\u1ea1o ra nh\u1eefng s\u1ea3n ph\u1ea9m ch\u1ea5t l\u01b0\u1ee3ng nh\u01b0ng \u0111\u1ed3ng th\u1eddi c\u0169ng ti\u1ebfp t\u1ee5c t\u00ecm c\u00e1ch l\u00e0m sao \u0111\u1ec3 s\u1ea3n ph\u1ea9m \u1ea5y \u00edt t\u1ed1n k\u00e9m h\u01a1n. T\u00f4i th\u1ef1c s\u1ef1 mu\u1ed1n m\u1edf r\u1ed9ng \u0111\u1ed1i t\u01b0\u1ee3ng th\u00ednh gi\u1ea3 v\u00e0 mang \u0111\u1ebfn m\u1ed9t tr\u1ea3i nghi\u1ec7m \u00e2m nh\u1ea1c \u1edf 1 t\u1ea7m cao kh\u00e1c cho nhi\u1ec1u ng\u01b0\u1eddi h\u01a1n.<\/p>\n

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Monoblock Ayre MX-R c\u00f3 v\u1ecf m\u00e1y l\u00e0m t\u1eeb nh\u00f4m nguy\u00ean kh\u1ed1i phay r\u1ed7ng c\u00e1c v\u1ecb tr\u00ed \u0111\u1eb7t bo m\u1ea1ch<\/p><\/div>\n

Ph\u00f3ng vi\u00ean: \u00d4ng \u0111\u00e3 \u0111\u00fac k\u1ebft \u0111\u01b0\u1ee3c nh\u1eefng g\u00ec t\u1eeb c\u00e1c s\u1ea3n ph\u1ea9m v\u01b0\u1ee3t tr\u1ed9i m\u00e0 \u00f4ng \u0111\u00e3 thi\u1ebft k\u1ebf, n\u00f3 c\u00f3 \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng cho c\u00e1c s\u1ea3n ph\u1ea9m c\u00f3 gi\u00e1 c\u1ea3 ph\u1ea3i ch\u0103ng h\u01a1n?<\/strong><\/em><\/span><\/p>\n

Charlie:<\/strong>\u00a0Ch\u00fang t\u00f4i \u0111\u00e3 h\u1ecdc \u0111\u01b0\u1ee3c r\u1ea5t nhi\u1ec1u l\u00e0m sao \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u00e2m thanh th\u1ef1c s\u1ef1 c\u00f3 ch\u1ea5t nh\u1ea1c h\u1ea7u nh\u01b0 v\u1edbi b\u1ea5t k\u1ef3 th\u1ec3 lo\u1ea1i nh\u1ea1c n\u00e0o. C\u00f3 r\u1ea5t nhi\u1ec1u thi\u1ebft b\u1ecb c\u00f3 th\u1ec3 t\u1ecfa s\u00e1ng v\u1edbi m\u1ed9t lo\u1ea1i \u00e2m nh\u1ea1c c\u1ee5 th\u1ec3 n\u00e0o \u0111\u00f3, nh\u01b0ng khi k\u1ebft h\u1ee3p v\u1edbi 1 lo\u1ea1i kh\u00e1c th\u00ec k\u1ebft qu\u1ea3 ho\u00e0n to\u00e0n ng\u01b0\u1ee3c l\u1ea1i. V\u00ed d\u1ee5, qu\u1ea3 l\u00e0 kh\u00f3 kh\u0103n \u0111\u1ec3 \u0111\u00e1nh b\u1ea1i c\u00e1c thi\u1ebft k\u1ebf \u0111\u00e8n ch\u00e2n kh\u00f4ng 3 c\u1ef1c Single-end khi th\u1eed v\u1edbi d\u00e0n nh\u1ea1c th\u00ednh ph\u00f2ng hay t\u1ee9 t\u1ea5u \u0111\u00e0n d\u00e2y. Nh\u01b0ng n\u1ebfu ch\u01a1i nh\u1ea1c rock s\u00f4i \u0111\u1ed9ng th\u00ec m\u1ea1ch single-end l\u1ea1i c\u00f3 ch\u1ea5t \u00e2m c\u00f3 v\u1ebb nh\u01b0 tr\u01a1 l\u00ec ch\u1eb3ng c\u00f3 ch\u00fat s\u1ef1 s\u1ed1ng. M\u1ed9t s\u1ed1 thi\u1ebft b\u1ecb nghe tuy\u1ec7t v\u1eddi v\u1edbi b\u1ea3n ghi \u00e2m ch\u1ea5t l\u01b0\u1ee3ng cao, nh\u01b0ng th\u1ef1c s\u1ef1 kh\u00f3 nghe v\u1edbi b\u1ea3n trung b\u00ecnh. M\u1ed9t s\u1ed1 thi\u1ebft b\u1ecb l\u00e0m m\u1ecdi th\u1ee9 nghe hay h\u01a1n b\u1edfi v\u00ec \u00e2m thanh \u0111\u01b0\u1ee3c n\u00f3 t\u00f4 \u0111i\u1ec3m v\u00e0 tr\u1edf n\u00ean ng\u1ecdt ng\u00e0o.<\/p>\n

V\u1edbi thi\u1ebft b\u1ecb c\u1ee7a Ayre, khi b\u1ea1n \u0111\u01b0a v\u00e0o m\u1ed9t b\u1ea3n recording tuy\u1ec7t v\u1eddi, t\u1ea5t nhi\u00ean \u00e2m thanh s\u1ebd tuy\u1ec7t v\u1eddi. Nh\u01b0ng ngay c\u1ea3 khi b\u1ea1n \u0111\u01b0a v\u00e0o m\u1ed9t b\u1ea3n thu trung b\u00ecnh, b\u1ea1n s\u1ebd ph\u1ea3i th\u1ed1t l\u00ean: \u201cKh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 \u0111\u1ec1u tuy\u1ec7t v\u1eddi nh\u01b0ng giai \u0111i\u1ec7u c\u1ea5t l\u00ean th\u1eadt \u0111\u1eb9p l\u00e0m sao!” Khi \u0111\u00f3, c\u00e1c s\u1ef1 \u1ea3nh h\u01b0\u1edfng t\u1eeb c\u00e1c thi\u1ebft b\u1ecb th\u1eadt s\u1ef1 kh\u00f4ng c\u00f2n t\u1ed3n t\u1ea1i n\u1eefa. N\u0103m nay ch\u00fang t\u00f4i gi\u1edbi thi\u1ec7u m\u1ed9t lo\u1ea1t c\u00e1c s\u1ea3n ph\u1ea9m m\u1edbi v\u1edbi nh\u1eefng b\u01b0\u1edbc \u0111\u1ed9t ph\u00e1 th\u1ef1c s\u1ef1. \u1ede d\u00f2ng s\u1ea3n ph\u1ea9m hai k\u00eanh, ch\u00fang t\u00f4i c\u00f3 ampli t\u00edch h\u1ee3p AX-7e v\u00e0 \u0111\u1ea7u ph\u00e1t CD CX-7eMP. Ch\u00fang \u0111\u1ec1u tuy\u1ec7t v\u1eddi v\u00e0 s\u1ebd v\u1eabn gi\u1eef \u0111\u01b0\u1ee3c gi\u00e1 tr\u1ecb th\u1eadt d\u00f9 \u1edf b\u1ea5t c\u1ee9 m\u1ee9c gi\u00e1 n\u00e0o. Khi b\u1ea1n c\u1ea3m \u0111\u01b0\u1ee3c vi\u1ec7c th\u01b0\u1edfng th\u1ee9c \u00e2m nh\u1ea1c kh\u00f4ng gi\u1edbi h\u1ea1n, th\u00f3at ly ho\u00e0n to\u00e0n kh\u1ecfi c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ed1i gh\u00e9p \u0111\u00f3 ch\u00ednh l\u00e0 \u0111i\u1ec1u tuy\u1ec7t v\u1eddi h\u01a1n bao gi\u1edd h\u1ebft.<\/p>\n

Ph\u00f3ng vi\u00ean: Cho t\u00f4i bi\u1ebft m\u1ed9t ch\u00fat v\u1ec1 tri\u1ebft l\u00fd thi\u1ebft k\u1ebf c\u1ee7a \u00f4ng. Nhi\u1ec1u nh\u00e0 thi\u1ebft k\u1ebf cho r\u1eb1ng thi\u1ebft k\u1ebf m\u1ea1ch s\u1eed d\u1ee5ng h\u1ed3i ti\u1ebfp to\u00e0n ph\u1ea7n s\u1ebd r\u1ea5t c\u00f3 l\u1ee3i, nh\u01b0ng s\u1ea3n ph\u1ea9m c\u1ee7a \u00f4ng l\u1ea1i ho\u00e0n to\u00e0n kh\u00f4ng h\u1ed3i ti\u1ebfp. T\u1ea1i sao l\u1ea1i nh\u01b0 v\u1eady?<\/strong><\/em><\/span><\/p>\n

Charlie:<\/strong>\u00a0Theo kinh nghi\u1ec7m c\u1ee7a t\u00f4i, nh\u1eefng \u00e2m thanh t\u1ef1 nhi\u00ean nh\u1ea5t \u0111\u1ec1u \u0111\u1ebfn t\u1eeb c\u00e1c m\u1ea1ch kh\u00f4ng h\u1ed3i ti\u1ebfp. H\u1ed3i ti\u1ebfp \u00e2m do \u00f4ng Harold Black ph\u00e1t minh trong nh\u1eefng n\u0103m 1920 cho c\u00f4ng ty \u0111i\u1ec7n tho\u1ea1i. N\u00f3 s\u1eed d\u1ee5ng c\u00e1c b\u1ed9 khu\u1ebfch \u0111\u1ea1i l\u1eb7p l\u1ea1i ch\u1ea1y d\u1ecdc theo \u0111\u01b0\u1eddng d\u00e2y \u0111i\u1ec7n tho\u1ea1i, l\u00e0m t\u0103ng t\u00edn hi\u1ec7u \u0111\u1ec3 b\u00f9 \u0111\u1eafp cho nh\u1eefng t\u1ed5n th\u1ea5t trong c\u00e1c d\u00e2y d\u1eabn d\u00e0i. \u0110i\u1ec1u t\u1ed1i quan tr\u1ecdng trong ph\u01b0\u01a1ng ph\u00e1p n\u00e0y l\u00e0 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c gain matching ch\u00ednh x\u00e1c gi\u1eefa c\u00e1c b\u1ed9 khu\u1ebfch \u0111\u1ea1i n\u00e0y, m\u1eb7c kh\u00e1c theo \u0111i\u1ec1u ki\u1ec7n k\u1ef9 thu\u1eadt th\u1eddi \u0111\u00f3, vi\u1ec7c \u0111i\u1ec1u ch\u1ec9nh gain s\u1ebd \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1eb1ng \u0111\u00e8n \u0111i\u1ec7n t\u1eed do \u0111\u00f3 r\u1ea5t kh\u00f3 \u0111\u1ea1t \u0111\u01b0\u1ee3c gi\u00e1 tr\u1ecb ch\u00ednh x\u00e1c. Tuy nhi\u00ean, b\u1eb1ng c\u00e1ch \u00e1p d\u1ee5ng h\u1ed3i ti\u1ebfp cho c\u00e1c m\u1ea1ch khu\u1ebfch \u0111\u1ea1i, gain b\u00e2y gi\u1edd \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp b\u1eb1ng c\u00e1c gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf v\u00e0 ho\u00e0n to\u00e0n kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o s\u1ef1 bi\u1ebfn thi\u00ean c\u1ee7a \u0111\u00e8n \u0111i\u1ec7n t\u1eed, k\u1ebft qu\u1ea3 l\u00e0 b\u00e0i to\u00e1n v\u1ec1 gain matching \u0111\u00e3 c\u00f3 l\u1eddi gi\u1ea3i. \u0110\u00e2y c\u0169ng ch\u00ednh l\u00e0 l\u00fd do th\u1ef1c t\u1ebf v\u00ec sao h\u1ed3i ti\u1ebfp \u00e2m \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n.<\/p>\n

M\u1ea1ch h\u1ed3i ti\u1ebfp c\u0169ng c\u1ea3i thi\u1ec7n c\u00e1c \u0111\u1eb7c t\u00ednh \u0111o l\u01b0\u1eddng c\u1ee7a m\u1ea1ch khu\u1ebfch \u0111\u1ea1i b\u1eb1ng c\u00e1ch t\u0103ng b\u0103ng th\u00f4ng, gi\u1ea3m s\u1ef1 bi\u1ebfn d\u1ea1ng (\u00edt nh\u1ea5t l\u00e0 cho t\u00edn hi\u1ec7u \u1ed5n \u0111\u1ecbnh), v\u00e0 gi\u1ea3m kh\u00e1ng tr\u1edf \u0111\u1ea7u ra; ch\u00ednh nh\u1edd nh\u1eefng \u01b0u \u0111i\u1ec3m n\u00e0y, m\u1ea1ch h\u1ed3i ti\u1ebfp \u0111\u00e3 tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn trong c\u00e1c thi\u1ebft k\u1ebf m\u1ea1ch \u00e2m thanh. Trong nhi\u1ec1u th\u1eadp k\u1ef7, ng\u01b0\u1eddi ta cho r\u1eb1ng c\u00f3 s\u1ef1 t\u01b0\u01a1ng quan tr\u1ef1c ti\u1ebfp gi\u1eefa k\u1ebft qu\u1ea3 \u0111o l\u01b0\u1eddng v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng \u00e2m thanh. Nh\u01b0ng th\u1ef1c t\u1ebf v\u1ec1 m\u1ea1ch h\u1ed3i ti\u1ebfp c\u00f3 nh\u1eefng y\u1ebfu t\u1ed1 v\u00f4 h\u00ecnh kh\u00f3 c\u00f3 th\u1ec3 t\u00ednh to\u00e1n m\u00e0 d\u01b0\u1eddng nh\u01b0 n\u00f3 l\u1ea1i \u1ea3nh h\u01b0\u1edfng kh\u00f4ng t\u1ed1t \u0111\u1ebfn ch\u1ea5t l\u01b0\u1ee3ng \u00e2m thanh c\u1ee7a c\u00e1c nh\u1ea1c c\u1ee5 th\u1eadt. C\u00f3 v\u1ebb nh\u01b0 n\u00f3 c\u00f3 li\u00ean quan \u0111\u1ebfn c\u00e1c v\u1ea5n \u0111\u1ec1 th\u1eddi gian.<\/p>\n

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Ampli 2 k\u00eanh Ayre VX-5 k\u1ebf th\u1eeba h\u1ea7u h\u1ebft c\u00e1c \u01b0u \u0111i\u1ec3m t\u1eeb ampli 2 k\u00eanh VX-R<\/p><\/div>\n

Ph\u00f3ng vi\u00ean: C\u00e1c v\u1ea5n \u0111\u1ec1 th\u1eddi gian \u00e0? \u00d4ng c\u00f3 th\u1ec3 n\u00f3i r\u00f5 th\u00eam kh\u00f4ng?<\/strong><\/em><\/span><\/p>\n

Charlie:<\/strong>\u00a0V\u00e2ng, ngh\u0129 \u0111\u01a1n gi\u1ea3n nh\u1ea5t th\u00ec m\u1ea1ch h\u1ed3i ti\u1ebfp kh\u00f4ng th\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0o \u0111\u00f3 cho \u0111\u1ebfn khi v\u1ea5n \u0111\u1ec1 \u0111\u00f3 ph\u00e1t sinh. V\u00e0 \u0111i\u1ec1u n\u00e0y c\u00f3 li\u00ean quan kha kh\u00e1 \u0111\u1ebfn nh\u1eefng g\u00ec ch\u00fang ta nghe. So v\u1edbi m\u1ed9t thi\u1ebft k\u1ebf kh\u00f4ng h\u1ed3i ti\u1ebfp, b\u1ed5 sung m\u1ea1ch h\u1ed3i ti\u1ebfp c\u00f3 v\u1ebb c\u01b0\u1eddng \u0111i\u1ec7u h\u00f3a ngu\u1ed3n t\u00edn hi\u1ec7u. N\u00f3 c\u00f3 th\u1ec3 cho ta \u00e2m thanh \u201cho\u00e0nh tr\u00e1ng\u201d x\u00e9t theo kh\u1ea3 n\u0103ng th\u01b0\u1edfng th\u1ee9c hi-fi, nh\u01b0ng th\u1eadt ra ch\u1ea5t \u00e2m nh\u1ea1c t\u1ef1 nhi\u00ean l\u1ea1i \u00edt h\u01a1n so v\u1edbi thi\u1ebft k\u1ebf kh\u00f4ng h\u1ed3i ti\u1ebfp. V\u00e0 d\u01b0\u1eddng nh\u01b0 \u00e2m thanh tuy\u1ec7t v\u1eddi nh\u1ea5t n\u00e0y c\u0169ng t\u1ed3n t\u1ea1i d\u01b0\u1edbi nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n nh\u1ea5t \u0111\u1ecbnh. M\u1eb7t kh\u00e1c, m\u1ed9t thi\u1ebft k\u1ebf kh\u00f4ng h\u1ed3i ti\u1ebfp x\u00e9t theo quan \u0111i\u1ec3m \u00e2m thanh th\u00ec r\u1ea5t gi\u1ed1ng \u201ccon t\u1eafc k\u00e8 b\u00f4ng\u201d. Theo kinh nghi\u1ec7m b\u1ea3n th\u00e2n, c\u00e1c m\u1eabu thi\u1ebft k\u1ebf kh\u00f4ng h\u1ed3i ti\u1ebfp s\u1ebd “tho\u00e1t kh\u1ecfi l\u1ed1i m\u00f2n” c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb \u00e2m thanh ch\u1ec9 c\u00f3 th\u1ec3 ch\u01a1i t\u1ed1t m\u1ed9t v\u00e0i th\u1ec3 lo\u1ea1i \u00e2m nh\u1ea1c. V\u00e0 v\u1edbi thi\u1ebft k\u1ebf c\u1ee7a ch\u00fang t\u00f4i th\u00ec kh\u00f4ng c\u00f3 b\u1ea5t k\u1ef3 l\u00fd do g\u00ec ph\u1ea3i s\u1eed d\u1ee5ng m\u1ea1ch h\u1ed3i ti\u1ebfp. \u0110\u01a1n c\u1eed b\u1ed9 ampli c\u00f4ng su\u1ea5t Ayre V-5xe c\u00f3 b\u0103ng th\u00f4ng kho\u1ea3ng 200KHz , \u0111\u1ed9 m\u00e9o kho\u1ea3ng 0,1 % \u1edf m\u1ee9c 100 watt, v\u00e0 tr\u1edf kh\u00e1ng \u0111\u1ea7u ra kho\u1ea3ng 0,2 ohms. V\u1edbi thi\u1ebft k\u1ebf kh\u00f4ng h\u1ed3i ti\u1ebfp th\u00ec c\u00e1c th\u00f4ng s\u1ed1 n\u00e0y l\u00e0 qu\u00e1 ho\u00e0n h\u1ea3o. Th\u1ef1c s\u1ef1 kh\u00f4ng c\u00f3 l\u00fd do g\u00ec \u0111\u1ec3 s\u1eed d\u1ee5ng h\u1ed3i ti\u1ebfp khi ch\u00fang ta c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c th\u00f4ng s\u1ed1 nh\u01b0 v\u1eady m\u00e0 kh\u00f4ng c\u1ea7n c\u00f3 n\u00f3.<\/p>\n

Ph\u00f3ng vi\u00ean: \u00d4ng c\u0169ng s\u1eed d\u1ee5ng m\u1ea1ch thu\u1eadt to\u00e1n r\u1eddi r\u1ea1c b\u1ea5t c\u1ee9 n\u01a1i n\u00e0o c\u00f3 th\u1ec3 trong c\u00e1c s\u1ea3n ph\u1ea9m. \u00d4ng c\u00f3 vui l\u00f2ng cho bi\u1ebft th\u00eam v\u1ec1 \u0111i\u1ec1u n\u00e0y?<\/strong><\/em><\/span><\/p>\n

Charlie:<\/strong>\u00a0S\u1eed d\u1ee5ng m\u1ea1ch thu\u1eadt to\u00e1n r\u1eddi r\u1ea1c so v\u1edbi m\u1ea1ch t\u00edch h\u1ee3p c\u0169ng gi\u1ed1ng nh\u01b0 l\u00e0m m\u1ed9t c\u00e1i b\u00e1nh t\u1eeb \u0111\u1ea7u so v\u1edbi l\u00e0m c\u00e1i b\u00e1nh b\u1eb1ng c\u00e1ch tr\u1ed9n l\u1ea1i. R\u00f5 r\u00e0ng s\u1ebd d\u1ec5 d\u00e0ng v\u00e0 r\u1ebb h\u01a1n \u0111\u1ec3 l\u00e0m cho m\u1ed9t chi\u1ebfc b\u00e1nh b\u1eb1ng c\u00e1ch pha tr\u1ed9n t\u1eeb h\u1ed7n h\u1ee3p n\u00e0o \u0111\u00f3, v\u00e0 b\u1ea1n c\u0169ng kh\u00f4ng c\u1ea7n ph\u1ea3i bi\u1ebft nhi\u1ec1u v\u1ec1 n\u1ea5u \u0103n \u0111\u1ec3 th\u1ef1c hi\u1ec7n n\u00f3. \u0110i\u1ec1u n\u00e0y c\u0169ng t\u01b0\u01a1ng t\u1ef1 v\u1edbi c\u00e1c m\u1ea1ch \u00e2m thanh. M\u1ea1ch thu\u1eadt to\u00e1n r\u1eddi r\u1ea1c cho ta c\u01a1 h\u1ed9i l\u1edbn h\u01a1n \u0111\u1ec3 s\u1eed d\u1ee5ng c\u00e1c linh ki\u1ec7n ch\u1ea5t l\u01b0\u1ee3ng cao nh\u1ea5t, trong b\u1ea5t k\u1ef3 c\u1ea5u h\u00ecnh c\u00f3 th\u1ec3 t\u01b0\u1edfng t\u01b0\u1ee3ng n\u00e0o v\u00e0 c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh c\u00e1c th\u00f4ng s\u1ed1 \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u qu\u1ea3 cao nh\u1ea5t cho 1 m\u1ee5c \u0111\u00edch c\u1ee5 th\u1ec3. \u0110\u00e2y l\u00e0 c\u00e1ch duy nh\u1ea5t n\u1ebfu b\u1ea1n mu\u1ed1n cho ra \u0111\u1eddi 1 s\u1ea3n ph\u1ea9m xu\u1ea5t s\u1eafc, hi\u1ec7n \u0111\u1ea1i \u0111\u00edch th\u1ef1c.<\/p>\n

Ph\u00f3ng vi\u00ean: L\u00e0m th\u1ebf n\u00e0o \u00f4ng c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c ch\u1ea5t l\u01b0\u1ee3ng \u00e2m thanh mong mu\u1ed1n nh\u01b0 th\u1ebf trong c\u00e1c \u00e2m-li t\u00edch h\u1ee3p AX-7e v\u00e0 CD player CX-7eMP m\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 h\u1ed7 tr\u1ee3 c\u1ee7a m\u1ea1ch thu\u1eadt to\u00e1n r\u1eddi r\u1ea1c?<\/strong><\/em><\/span><\/p>\n

Charlie:<\/strong>\u00a0\u1ede c\u00e1c s\u1ea3n ph\u1ea9m n\u00e0y, ch\u00fang t\u00f4i \u0111ang s\u1eed d\u1ee5ng IC (m\u1ea1ch t\u00edch h\u1ee3p) do ti\u1ebfn s\u0129 Barrie Gilbert – m\u1ed9t trong nh\u1eefng “b\u1ed1 gi\u00e0” c\u1ee7a thi\u1ebft k\u1ebf m\u1ea1ch analog thi\u1ebft k\u1ebf. B\u00e2y gi\u1edd, b\u1ea1n c\u1ea7n ph\u00e2n bi\u1ec7t gi\u1eefa c\u00e1c thu\u1eadt ng\u1eef “m\u1ea1ch t\u00edch h\u1ee3p” (integrated circuit – IC) v\u00e0 “op-amp” (m\u1ea1ch khu\u1ebfch \u0111\u1ea1i thu\u1eadt t\u00f3an). Ch\u00fang t\u00f4i \u0111ang s\u1eed d\u1ee5ng m\u1ea1ch t\u00edch h\u1ee3p, bao g\u1ed3m nhi\u1ec1u transistor tr\u00ean m\u1ed9t \u0111\u1ebf silicon \u0111\u01a1n.Tr\u00e1i l\u1ea1i, op-amp s\u1eed d\u1ee5ng m\u1ea1ch h\u1ed3i ti\u1ebfp nh\u01b0 nguy\u00ean t\u1eafc ho\u1ea1t \u0111\u1ed9ng c\u01a1 b\u1ea3n c\u1ee7a n\u00f3. B\u1ea1n kh\u00f4ng th\u1ec3 s\u1eed d\u1ee5ng m\u1ed9t op-amp trong c\u00e1c m\u1ea1ch kh\u00f4ng h\u1ed3i ti\u1ebfp. C\u00e1c c\u1ea5u tr\u00fac li\u00ean k\u1ebft c\u1ee7a m\u1ea1ch t\u00edch h\u1ee3p m\u00e0 ch\u00fang t\u00f4i s\u1eed d\u1ee5ng trong c\u00e1c s\u1ea3n ph\u1ea9m d\u00f2ng nh\u1eadp m\u00f4n (Series 7) r\u1ea5t gi\u1ed1ng v\u1edbi c\u1ea5u tr\u00fac li\u00ean k\u1ebft c\u1ee7a m\u1ea1ch thu\u1eadt to\u00e1n r\u1eddi r\u1ea1c d\u00f9 th\u1ef1c t\u1ebf \u0111\u00f3 v\u1eabn l\u00e0 m\u1ea1ch t\u00edch h\u1ee3p. \u1ede Ayre Acoustics, ch\u00fang t\u00f4i \u0111\u00e3 t\u00ecm ra c\u00e1ch th\u1ef1c hi\u1ec7n c\u00e1c m\u1ea1ch t\u00edch h\u1ee3p nguy\u00ean kh\u1ed1i v\u1edbi m\u1ea1ch kh\u00f4ng h\u1ed3i ti\u1ebfp. B\u1eb1ng k\u1ebft h\u1ee3p s\u1eed d\u1ee5ng 2 y\u1ebfu t\u1ed1 n\u00e0y k\u00e8m theo m\u1ed9t ch\u00fat bi\u1ebfn \u0111\u1ed5i, ch\u00fang ta c\u00f3 th\u1ec3 \u0111\u1ea1t g\u1ea7n \u0111\u01b0\u1ee3c \u0111\u1eb7c t\u00ednh h\u1ecdat \u0111\u1ed9ng c\u1ee7a m\u1ea1ch thu\u1eadt to\u00e1n r\u1eddi r\u1ea1c v\u1edbi m\u1ee9c chi ph\u00ed th\u1ea5p h\u01a1n nhi\u1ec1u. L\u1ee3i th\u1ebf quan tr\u1ecdng c\u1ee7a thi\u1ebft k\u1ebf nguy\u00ean kh\u1ed1i c\u1ee7a c\u00e1c m\u1ea1ch t\u00edch h\u1ee3p l\u00e0 t\u1ea5t c\u1ea3 c\u00e1c transistor \u0111\u01b0\u1ee3c k\u1ebft h\u1ee3p r\u1ea5t ch\u1eb7t ch\u1ebd v\u1edbi nhau. Ng\u01b0\u1ee3c l\u1ea1i, v\u1edbi c\u00e1c m\u1ea1ch thu\u1eadt to\u00e1n r\u1eddi r\u1ea1c, ch\u00fang t\u00f4i ph\u1ea3i d\u00e0nh r\u1ea5t nhi\u1ec1u th\u1eddi gian \u0111\u1ec3 t\u00ednh to\u00e1n, ph\u00e2n lo\u1ea1i v\u00e0 t\u00ecm ki\u1ebfm c\u00e1c transistor ph\u00f9 h\u1ee3p (c\u00f3 gi\u00e1 tr\u1ecb bi\u1ebfn thi\u00ean x\u1ea5p x\u1ec9 nhau), \u0111i\u1ec1u \u0111\u00f3 c\u0169ng c\u00f3 ngh\u0129a l\u00e0 s\u1ea3n ph\u1ea9m cu\u1ed1i c\u00f9ng s\u1ebd \u0111\u1eaft ti\u1ec1n h\u01a1n. B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u1ea1ch t\u00edch h\u1ee3p v\u1edbi c\u00e1ch tr\u01b0\u1edbc gi\u1edd ch\u01b0a t\u1eebng s\u1eed d\u1ee5ng, ch\u00fang t\u00f4i c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c 1 b\u01b0\u1edbc \u0111\u1ed9t ph\u00e1 hi\u1ec7u su\u1ea5t \u1edf \u0111i\u1ec3m gi\u00e1 th\u1ef1c. Khi gi\u1edbi h\u1ea1n duy nh\u1ea5t ch\u00ednh l\u00e0 tr\u00ed t\u01b0\u1edfng t\u01b0\u1ee3ng c\u1ee7a b\u1ea1n th\u00ec ch\u1ec9 c\u00f2n m\u1ed9t con \u0111\u01b0\u1eddng \u0111\u1ec3 t\u1ed3n t\u1ea1i \u0111\u00f3 ch\u00ednh l\u00e0 d\u1ed1c to\u00e0n l\u1ef1c cho vi\u1ec7c ph\u00e1t tri\u1ec3n k\u1ef9 thu\u1eadt. Tuy nhi\u00ean, ch\u1ec9 nghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt l\u00e0 ch\u01b0a \u0111\u1ee7, th\u00e1ch th\u1ee9c th\u1ef1c s\u1ef1 ch\u00ednh l\u00e0 mang nh\u1eefng b\u00e0i h\u1ecdc \u0111\u00f3 tr\u1edf v\u1ec1 v\u1edbi th\u1ebf gi\u1edbi th\u1ef1c n\u01a1i c\u00f3 nhi\u1ec1u ng\u01b0\u1eddi c\u00f3 th\u1ec3 th\u01b0\u1edfng th\u1ee9c th\u00e0nh qu\u1ea3 lao \u0111\u1ed9ng c\u1ee7a ch\u00fang t\u00f4i h\u01a1n.<\/p>\n

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D\u00f2ng s\u1ea3n ph\u1ea9m Series 5 c\u1ee7a Ayre (t\u1eeb tr\u00ean xu\u1ed1ng): \u0110\u1ea7u ph\u00e1t C5-xeMP, Phono P5-xe,\u00a0Pre K-5xe, l\u1ecdc ngu\u1ed3n P-5xe v\u00e0 Power V5-xe<\/p><\/div>\n

Ph\u00f3ng vi\u00ean: T\u00f4i th\u1ea5y d\u1ea1o n\u00e0y ng\u00e0y c\u00e0ng c\u00f3 nhi\u1ec1u s\u1ea3n ph\u1ea9m c\u00f3 c\u00f4ng ngh\u1ec7 b\u1ed9 ngu\u1ed3n c\u1ee7a \u00f4ng k\u1ebft h\u1ee3p m\u1ea1ch l\u1ecdc d\u1ea1ng quy n\u1ea1p. N\u00f3 c\u1ea3i thi\u1ec7n ch\u1ea5t l\u01b0\u1ee3ng \u00e2m thanh nh\u01b0 th\u1ebf n\u00e0o?<\/strong><\/em><\/span><\/p>\n

Charlie:<\/strong>\u00a0Hmm, tr\u01b0\u1edbc h\u1ebft b\u1ea1n n\u00ean nh\u1edb r\u1eb1ng c\u00f3 2 c\u00e1ch kh\u00e1c nhau \u0111\u1ec3 s\u1eed d\u1ee5ng m\u1ea1ch l\u1ecdc d\u1ea1ng quy n\u1ea1p (filter inductor) trong m\u1ed9t b\u1ed9 ngu\u1ed3n. C\u00e1ch th\u1ee9 nh\u1ea5t l\u00e0 b\u1ed1 tr\u00ed m\u1ea1ch ph\u00eda tr\u01b0\u1edbc c\u00e1c t\u1ee5 l\u1ecdc ngay sau khi ch\u1ec9nh l\u01b0u. C\u00e1ch th\u1ee9 hai l\u00e0 b\u1ed1 tr\u00ed sau t\u1ee5 l\u1ecdc. Ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u201cinductor-input filter\u201d hay “choke-input filter” (nh\u1ea5n m\u1ea1nh ” input”). Ph\u01b0\u01a1ng ph\u00e1p th\u1ee9 hai \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 “choke filtering” ho\u1eb7c l\u1ecdc c\u1ea3m kh\u00e1ng. N\u1ebfu b\u1ea1n nh\u00ecn k\u1ef9 v\u00e0o c\u00e1c qu\u1ea3ng c\u00e1o, b\u1ea1n s\u1ebd th\u1ea5y r\u1eb1ng h\u1ea7u h\u1ebft c\u00e1c c\u00f4ng ty ch\u00e0o b\u00e1n choke th\u1ef1c s\u1ef1 \u0111ang s\u1eed d\u1ee5ng “choke filtering”, nh\u01b0 v\u1eady \u00edt t\u1ed1n k\u00e9m h\u01a1n l\u00e0 ” choke-input filtering”. C\u1ea3 2 ph\u01b0\u01a1ng ph\u00e1p n\u00e0y s\u1ebd l\u00e0m gi\u1ea3m ti\u1ebfng nhi\u1ec5u \u1ed3n t\u1ea7n s\u1ed1 cao v\u00e0o d\u00f2ng AC, \u0111\u00f3 l\u00e0 m\u1ed9t \u0111i\u1ec1u t\u1ed1t x\u00e9t tr\u00ean quan \u0111i\u1ec3m ch\u1ea5t \u00e2m thanh. Nh\u01b0ng ch\u1ec9 c\u00f3 c\u00e1ch l\u1ecdc c\u1ea3m kh\u00e1ng ngay t\u1eeb ng\u00f5 v\u00e0o (inductor-input filter) m\u1edbi t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n n\u1ea1p li\u00ean t\u1ee5c \u0111\u1ebfn t\u1ee5 l\u1ecdc b\u1edfi n\u0103ng l\u01b0\u1ee3ng \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong t\u1eeb tr\u01b0\u1eddng c\u1ee7a cu\u1ed9n c\u1ea3m lu\u00f4n \u0111\u01b0\u1ee3c n\u1ea1p v\u00e0o c\u00e1c t\u1ee5 \u0111i\u1ec7n. B\u1ea5t k\u1ef3 ph\u01b0\u01a1ng ph\u00e1p n\u00e0o kh\u00e1c \u0111\u1ec1u t\u1ea1o ra xung \u1edf d\u00f2ng \u0111i\u1ec7n n\u1ea1p v\u00e0o. Do \u0111\u00f3, thi\u1ebft k\u1ebf inductor-input filter lu\u00f4n cung c\u1ea5p ngu\u1ed3n DC tinh khi\u1ebft h\u01a1n 1 ngu\u1ed3n cung c\u1ea5p ti\u00eau chu\u1ea9n, k\u1ebft qu\u1ea3 sau c\u00f9ng l\u00e0 c\u1ea3i thi\u1ec7n ch\u1ea5t l\u01b0\u1ee3ng \u00e2m thanh. V\u1ea5n \u0111\u1ec1 \u1edf ch\u1ed7 chi ph\u00ed cho b\u1ed9 ngu\u1ed3n s\u1ebd t\u0103ng g\u1ea7n g\u1ea5p \u0111\u00f4i. Nh\u01b0ng theo t\u00f4i, \u0111\u00e2y l\u00e0 m\u1ed9t \u0111\u1ea7u t\u01b0 x\u1ee9ng \u0111\u00e1ng.<\/p>\n

Khi b\u1eaft \u0111\u1ea7u l\u00e0m d\u00f2ng s\u1ea3n ph\u1ea9m m\u1edbi, ch\u00fang t\u00f4i bi\u1ebft ch\u1eafc ngay t\u1eeb \u0111\u1ea7u r\u1eb1ng s\u1ebd kh\u00f4ng c\u00f3 m\u1ed9t h\u00e3ng cung c\u1ea5p n\u00e0o t\u00ean th\u1ecb tr\u01b0\u1eddng s\u1eed d\u1ee5ng m\u1ea1ch l\u1ecdc c\u1ea3m kh\u00e1ng \u0111\u00fang ngh\u0129a. Ch\u00ednh v\u00ec v\u1eady, ch\u00fang t\u00f4i quy\u1ebft \u0111\u1ecbnh ph\u00e1t tri\u1ec3n m\u1ea1ch m\u1edbi c\u00f3 th\u1ec3 mi\u1ec5n nhi\u1ec5m b\u1ea5t k\u1ef3 ti\u1ebfng \u1ed3n n\u00e0o g\u00e2y ra t\u1eeb b\u1ed9 ngu\u1ed3n. K\u1ebft qu\u1ea3 ch\u00fang t\u00f4i cho ra \u0111\u1eddi m\u1ea1ch d\u00f2ng \u0111\u1ed1i x\u1ee9ng (current-mirror). M\u1ea1ch n\u00e0y kho\u1ea3ng lo\u1ea1i b\u1ecf nhi\u1ec5u \u1ed3n t\u1ed1t h\u01a1n 1000 l\u1ea7n cho c\u00e1c b\u1ed9 ngu\u1ed3n s\u1eed d\u1ee5ng.<\/p>\n

Ph\u00f3ng vi\u00ean: \u00d4ng c\u00f3 s\u1eed d\u1ee5ng b\u1ea5t k\u1ef3 k\u1ef9 thu\u1eadt n\u00e0o kh\u00e1c \u0111\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 ti\u1ebfng \u1ed3n tr\u00ean d\u00f2ng AC?<\/strong><\/em><\/span><\/p>\n

Charlie:<\/strong>\u00a0V\u00e2ng, c\u00f3 1 y\u1ebfu t\u1ed1 c\u1ef1c k\u1ef3 quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 t\u1ed1t nh\u1ea5t; Ch\u00fang t\u00f4i \u0111\u00e3 t\u1eebng s\u1eed d\u1ee5ng b\u1ed9 l\u1ecdc l\u00f5i ferrit \u0111\u1ec3 l\u00e0m s\u1ea1ch ngu\u1ed3n AC. Nh\u1eefng b\u1ed9 l\u1ecdc n\u00e0y th\u1ef1c s\u1ef1 h\u1ecdat \u0111\u1ed9ng r\u1ea5t t\u1ed1t b\u1edfi v\u00ec ch\u00fang kh\u00f4ng ch\u1eb7n n\u0103ng l\u01b0\u1ee3ng RF ho\u1eb7c d\u1eabn n\u00f3 xu\u1ed1ng m\u1eb7t \u0111\u1ea5t (th\u1ef1c s\u1ef1 r\u1ea5t kh\u00f3 c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n \u0111i\u1ec1u n\u00e0y m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3). Thay v\u00e0o \u0111\u00f3, ch\u00fang h\u1ea5p th\u1ee5 n\u0103ng l\u01b0\u1ee3ng RF v\u00e0 bi\u1ebfn n\u00f3 th\u00e0nh nhi\u1ec7t. K\u1ebft qu\u1ea3 cho ta n\u1ec1n trong h\u01a1n, gi\u1ea3m \u1ed3n, gi\u1ea3m nhi\u1ec5u v\u00e0 t\u1ea7n s\u1ed1 cao ng\u1ecdt ng\u00e0o h\u01a1n. Nh\u01b0ng th\u1eadt kh\u00f4ng may, c\u00e1c b\u1ed9 l\u1ecdc ferrit s\u1ebd b\u1ecb t\u1eeb h\u00f3a theo th\u1eddi gian. T\u00f4i kh\u00f4ng hi\u1ec3u \u0111\u1ea7y \u0111\u1ee7 c\u00e1c c\u01a1 ch\u1ebf li\u00ean quan, nh\u01b0ng b\u1ea1n c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng nghe th\u1ea5y hi\u1ec7u \u1ee9ng \u00e2m thanh d\u1ea7n tr\u1edf n\u00ean c\u1ee9ng ng\u1eaft, v\u00f4 h\u1ed3n. N\u1ebfu b\u1ea1n kh\u1eed t\u1eeb ferit, \u00e2m thanh s\u1ebd t\u1ed1t tr\u1edf l\u1ea1i nh\u01b0ng ch\u1ec9 trong m\u1ed9t v\u00e0i ng\u00e0y. Sau \u0111\u00f3, n\u00f3 l\u1ea1i ti\u1ebfp t\u1ee5c b\u1ecb t\u1eeb h\u00f3a m\u1ed9t l\u1ea7n n\u1eefa. \u0110\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y, ch\u00fang t\u00f4i \u0111\u00e3 ph\u00e1t tri\u1ec3n m\u1ed9t b\u1ed9 l\u1ecdc g\u1ecdi \u0111i\u1ec7n l\u00e0 Ayre Conditioner, n\u00f3 h\u1ea5p th\u1ee5 n\u0103ng l\u01b0\u1ee3ng RF gi\u1ed1ng nh\u01b0 ferit nh\u01b0ng ho\u00e0n to\u00e0n kh\u00f4ng b\u1ecb nhi\u1ec5m t\u1eeb t\u00ednh. Ngo\u00e0i ra, n\u00f3 ho\u1ea1t \u0111\u1ed9ng song song v\u1edbi d\u00f2ng AC v\u00ec v\u1eady kh\u00f4ng c\u00f3 h\u1ea1n ch\u1ebf d\u00f2ng g\u00ec. Th\u00f4ng th\u01b0\u1eddng khi s\u1eed d\u1ee5ng l\u1ecdc \u0111i\u1ec7n v\u1edbi c\u00e1c thi\u1ebft b\u1ecb \u00e2m thanh lu\u00f4n l\u00e0 s\u1ef1 \u0111\u00e1nh \u0111\u1ed5i: M\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1 (nh\u01b0 \u0111\u1ed9 trong c\u1ee7a ti\u1ebfng treble) c\u1ea3i thi\u1ec7n trong khi nh\u1eefng y\u1ebfu t\u1ed1 kh\u00e1c (th\u01b0\u1eddng l\u00e0 \u0111\u1ed9 s\u00e2u v\u00e0 \u0111\u1ed9 l\u1ef1c c\u1ee7a ti\u1ebfng bass) tr\u1edf n\u00ean t\u1ec7 h\u01a1n. Ch\u00fang t\u00f4i nh\u1eadn ra r\u1eb1ng Ayre Conditioner l\u00e0 b\u1ed9 l\u1ecdc duy nh\u1ea5t kh\u00f4ng y\u00eau c\u1ea7u h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n \u0111\u00e1nh \u0111\u1ed5i b\u1ea5t c\u1ee9 th\u1ee9 g\u00ec.<\/p>\n

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Charles Hansen v\u00e0 “S\u1ea3n ph\u1ea9m c\u1ee7a n\u0103m 2009”: \u0110\u1ea7u gi\u1ea3i m\u00e3 USB Ayre QB-9 do t\u1ea1p ch\u00ed StereoPhile b\u00ecnh ch\u1ecdn<\/p><\/div>\n

Ph\u00f3ng vi\u00ean: Chuy\u1ec1n sang \u0111\u1ec1 t\u00e0i kh\u00e1c, ch\u00fang ta h\u00e3y n\u00f3i v\u1ec1 \u00e2m thanh k\u1ef9 thu\u1eadt s\u1ed1. C\u00f4ng ngh\u1ec7 “Upsampling” trong m\u1ed9t s\u1ed1 ng\u00e0nh c\u00f4ng nghi\u1ec7p \u0111\u01b0\u1ee3c xem nh\u01b0 l\u00e0 “Vi\u00ean \u0111\u1ea1n ma thu\u1eadt – Magic bullet” \u0111\u1ec3 c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng th\u1ec3 hi\u1ec7n to\u00e0n b\u1ed9 b\u1ed9 s\u01b0u t\u1eadp CD hi\u1ec7n c\u00f3. \u00d4ng ngh\u0129 nh\u01b0 th\u1ebf n\u00e0o v\u1ec1 \u0111i\u1ec1u n\u00e0y?<\/strong><\/em><\/span><\/p>\n

Charlie:<\/strong>\u00a0Tr\u01b0\u1edbc h\u1ebft, “upsampling” l\u00e0 m\u1ed9t thu\u1eadt ng\u1eef marketing, kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t thu\u1eadt ng\u1eef k\u1ef9 thu\u1eadt. T\u1eeb m\u1ed9t quan \u0111i\u1ec3m k\u1ef9 thu\u1eadt, ho\u00e0n to\u00e0n kh\u00f4ng c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa upsampling v\u00e0 oversampling. 30 n\u0103m tr\u01b0\u1edbc \u0111\u00e2y, m\u1ed1t marketing g\u1ecdi \u0111\u00f3 l\u00e0 \u0111\u1ed9 m\u00e9o th\u1ea5p. B\u00e2y gi\u1edd th\u00ec h\u1ecd g\u1ecdi \u0111\u00f3 l\u00e0 upsampling. Khi c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t n\u00f3i v\u1ec1 upsampling, h\u1ecd \u0111ang \u0111\u1ec1 c\u1eadp \u0111\u1ebfn m\u1ed9t th\u1ef1c t\u1ebf r\u1eb1ng c\u00f3 hai b\u1ed9 l\u1ecdc k\u1ef9 thu\u1eadt s\u1ed1 ho\u1ea1t \u0111\u1ed9ng ri\u00eang bi\u1ec7t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. N\u1ebfu thay \u0111\u1ed5i b\u1ea5t c\u1ee9 \u0111i\u1ec1u g\u00ec tr\u00ean b\u1ed9 l\u1ecdc n\u00e0y, hi\u1ec3n nhi\u00ean b\u1ed9 l\u1ecdc k\u1ef9 thu\u1eadt s\u1ed1 c\u00f2n l\u1ea1i c\u0169ng s\u1ebd c\u00f3 nh\u1eefng thay \u0111\u1ed5i t\u01b0\u01a1ng \u1ee9ng. Tuy nhi\u00ean, k\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c ho\u00e0n to\u00e0n kh\u00f4ng c\u00f3 g\u00ec thay \u0111\u1ed5i, b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c nh\u1eefng k\u1ebft qu\u1ea3 gi\u1ed1ng h\u1ec7t nh\u01b0 v\u1eady b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng 1 b\u1ed9 l\u1ecdc k\u1ef9 thu\u1eadt s\u1ed1 c\u00f3 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m k\u1ebft h\u1ee3p c\u1ee7a b\u1ed9 l\u1ecdc upsampling v\u00e0 b\u1ed9 l\u1ecdc s\u1ed1 hi\u1ec7n t\u1ea1i.<\/p>\n

N\u00f3i c\u00e1ch kh\u00e1c, t\u1eeb quan \u0111i\u1ec3m k\u1ef9 thu\u1eadt, ho\u00e0n to\u00e0n kh\u00f4ng c\u00f3 g\u00ec m\u1edbi v\u1ec1 upsampling. Ngay c\u1ea3 \u00fd t\u01b0\u1edfng v\u1ec1 b\u1ed9 l\u1ecdc k\u1ef9 thu\u1eadt s\u1ed1 \u0111a t\u1ea7ng c\u0169ng kh\u00e1 l\u00e0 c\u1ed5 l\u1ed7 s\u1ec9, h\u1ea7u nh\u01b0 t\u1ea5t c\u1ea3 c\u00e1c b\u1ed9 l\u1ecdc s\u1ed1 \u0111\u1ec1u thu\u1ed9c d\u1ea1ng 2x. V\u00ed d\u1ee5, 1 b\u1ed9 l\u1ecdc n\u1ed9i suy 8x (oversampling) s\u1ebd bao g\u1ed3m 3 t\u1ea7ng 2x (2 x 2 x 2 = 8) \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u1ed1c \u0111\u1ed9 t\u1ed5ng th\u1ec3 8x. C\u00f3 1 s\u1ed1 “upsampler” kh\u00f4ng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n ngay trong m\u00e1y m\u00e0 t\u1eeb c\u00e1c thi\u1ebft b\u1ecb b\u00ean ngo\u00e0i. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, b\u1ea1n n\u00ean nh\u1edb r\u1eb1ng h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n s\u1ebd b\u1ecb t\u00e1c \u0111\u1ed9ng \u0111\u00e1ng k\u1ec3 t\u1eeb rung ch\u1ea5n v\u00e0 l\u00e0m \u00e2m thanh b\u1ecb thay \u0111\u1ed5i.<\/p>\n

C\u0169ng kh\u00f4ng n\u00ean hi\u1ec3u r\u1eb1ng upsampling s\u1ebd khi\u1ebfn \u00e2m thanh kh\u00f4ng hay. Ng\u01b0\u1ee3c l\u1ea1i, c\u1ea3i thi\u1ec7n b\u1ed9 l\u1ecdc k\u1ef9 thu\u1eadt s\u1ed1 c\u0169ng c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n ch\u1ea5t l\u01b0\u1ee3ng \u00e2m thanh. T\u00f3m l\u1ea1i, b\u1ea1n n\u00ean mua m\u1ed9t thi\u1ebft b\u1ecb v\u00ec ch\u1ea5t l\u01b0\u1ee3ng th\u1ef1c s\u1ef1 t\u1ed1t c\u1ee7a n\u00f3, kh\u00f4ng n\u00ean \u0111\u1ec3 b\u1ecb chi ph\u1ed1i b\u1edfi c\u00e1c c\u00e2u chuy\u1ec7n marketing xung quanh.<\/p>\n

Ph\u00f3ng vi\u00ean: M\u1ed9t s\u1ed1 ng\u01b0\u1eddi ph\u00e2n bi\u1ec7t “upsampling” v\u00e0 “oversampling” d\u1ef1a tr\u00ean vi\u1ec7c s\u1ea3n ph\u1ea9m n\u1ed9i suy \u0111\u1ed9 d\u00e0i word length c\u0169ng nh\u01b0 t\u1ef7 l\u1ec7 m\u1eabu ngh\u0129a l\u00e0 chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u 16 bit th\u00e0nh 24 bit .<\/strong><\/em><\/span><\/p>\n

Charlie:<\/strong>\u00a0\u0110i\u1ec1u \u0111\u00f3 ch\u1eb3ng c\u00f3 \u00fd ngh\u0129a g\u00ec c\u1ea3. T\u1ea5t c\u1ea3 c\u00e1c b\u1ed9 l\u1ecdc s\u1ed1 l\u00e0m vi\u1ec7c b\u1eb1ng c\u00e1ch nh\u00e2n d\u1eef li\u1ec7u theo h\u1ec7 s\u1ed1. C\u00e1ch m\u00e0 b\u1ea1n chuy\u1ec3n t\u1eeb 1 c\u1ee5m 16 bit th\u00e0nh 24 bit \u0111\u01a1n gi\u1ea3n l\u00e0 nh\u00e2n n\u00f3 v\u1edbi h\u1ec7 s\u1ed1 8 bit. Th\u00f4ng th\u01b0\u1eddng, c\u00e1c h\u1ec7 s\u1ed1 d\u00e0i h\u01a1n 8 bit nhi\u1ec1u. V\u00ed d\u1ee5, n\u1ebfu b\u1ea1n nh\u00e2n d\u1eef li\u1ec7u 16 bit v\u1edbi h\u1ec7 s\u1ed1 24 bit, b\u1ea1n s\u1ebd \u0111\u1ea1t m\u1ed9t c\u1ee5m 40 bit. Sau \u0111\u00f3 n\u00f3 ph\u1ea3i \u0111\u01b0\u1ee3c l\u00e0m tr\u00f2n (ho\u1eb7c c\u1eaft ng\u1eafn) \u0111\u1ec3 tr\u1edf l\u1ea1i d\u1eef li\u1ec7u 24 bit t\u1ea1i \u0111\u1ea7u ra c\u1ee7a b\u1ed9 l\u1ecdc s\u1ed1. B\u1ea5t k\u1ef3 b\u1ed9 l\u1ecdc s\u1ed1 hi\u1ec7n gi\u1edd s\u1ebd “n\u1ed9i suy” d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o 16 bit th\u00e0nh 24 bit t\u1ea1i \u0111\u1ea7u ra. Nh\u01b0ng d\u00f9 b\u1ea1n l\u00e0m g\u00ec \u0111i n\u1eefa, khi b\u1ea1n b\u1eaft \u0111\u1ea7u v\u1edbi d\u1eef li\u1ec7u 16 bit , b\u1ea1n s\u1ebd ch\u1ec9 c\u00f3 16 bit ch\u00ednh x\u00e1c \u1edf \u0111\u1ea7u ra. Th\u1eadm ch\u00ed n\u1ebfu b\u1ea1n nh\u00e2n v\u1edbi h\u1ec7 s\u1ed1 1000 bit, vi\u1ec7c t\u0103ng \u0111\u1ed9 ph\u00e2n gi\u1ea3i th\u1ef1c t\u1ebf c\u1ee7a t\u00edn hi\u1ec7u ban \u0111\u1ea7u l\u00e0 chuy\u1ec7n kh\u00f4ng th\u1ec3.<\/p>\n

Ph\u00f3ng vi\u00ean: Charlie, Ayre D-1x l\u00e0 m\u1ed9t trong nh\u1eefng \u0111\u1ea7u ph\u00e1t CD player hay nh\u1ea5t m\u00e0 t\u00f4i t\u1eebng nghe. Ngo\u00e0i D- 1x, \u00f4ng \u0111\u00e3 gi\u1edbi thi\u1ec7u CD player m\u1edbi CX- 7eMP t\u1ea1i th\u1eddi \u0111i\u1ec3m m\u00e0 nhi\u1ec1u c\u00f4ng ty hi-end kh\u00e1c \u0111ang v\u1eadt l\u1ed9n \u0111\u1ec3 ph\u00e1t h\u00e0nh chu\u1ea9n DVD-A v\u00e0 c\u00e1c \u0111\u1ea7u ph\u00e1t SACD player. T\u1ea1i sao v\u1eady?<\/em><\/strong><\/span><\/p>\n

Charlie:<\/strong>\u00a0Tr\u01b0\u1edbc h\u1ebft, c\u1ea3m \u01a1n v\u00ec nh\u1eefng l\u1eddi ng\u1ee3i khen \u0111\u1ea7u ph\u00e1t Ayre D-1x. Ch\u00fang t\u00f4i \u0111\u00e3 d\u00e0nh h\u01a1n 2 n\u0103m r\u00f2ng cho d\u1ef1 \u00e1n n\u00e0y, v\u00e0 th\u1eadt s\u1ef1 r\u1ea5t h\u00e0i l\u00f2ng v\u1edbi c\u00e1ch n\u00f3 \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o ra. Vi\u1ec7c s\u1ea3n ph\u1ea9m k\u1ef9 thu\u1eadt s\u1ed1 \u0111\u1ea7u ti\u00ean c\u1ee7a ch\u00fang t\u00f4i \u0111\u01b0\u1ee3c \u0111\u00f3n nh\u1eadn \u0111\u00e3 gi\u00fap ch\u00fang t\u00f4i nh\u1eadn \u0111\u01b0\u1ee3c r\u1ea5t nhi\u1ec1u t\u00edn nhi\u1ec7m trong ng\u00e0nh n\u00e0y.<\/p>\n

Nh\u01b0 b\u1ea1n \u0111\u1ec1 c\u1eadp, CX-7eMP l\u00e0 s\u1ea3n ph\u1ea9m k\u1ef9 thu\u1eadt s\u1ed1 th\u1ee9 hai c\u1ee7a ch\u00fang t\u00f4i sau D-1x. Ch\u00fang t\u00f4i ch\u1ecdn l\u00e0m \u0111\u1ea7u ph\u00e1t CD ch\u1ec9 h\u1ed7 tr\u1ee3 \u0111\u1ecbnh d\u1ea1ng CD, \u0111\u01a1n gi\u1ea3n b\u1edfi v\u00ec \u0111\u00f3 l\u00e0 l\u1ef1a ch\u1ecdn gi\u00e1 trung b\u00ecnh m\u00e0 hi\u1ec7u qu\u1ea3 cao nh\u1ea5t \u0111\u1ec3 th\u01b0\u1edfng th\u1ee9c \u00e2m nh\u1ea1c. T\u1ea1i th\u1eddi \u0111i\u1ec3m n\u00e0y, b\u1ed5 sung h\u1ed7 tr\u1ee3 SACD hay DVD-Audio l\u00e0m t\u0103ng chi ph\u00ed m\u00e1y. V\u1edbi gi\u1edbi h\u1ea1n v\u1ec1 s\u1ed1 l\u01b0\u1ee3ng ph\u1ea7n m\u1ec1m (\u0111\u0129a SACD, DVD-A), tr\u1ea3 th\u00eam h\u00e0ng ng\u00e0n \u0111\u00f4 la \u0111\u1ec3 c\u00f3 th\u1ec3 ch\u01a1i th\u00eam m\u1ed9t s\u1ed1 \u00edt c\u00e1c t\u1ef1a nh\u1ea1c, h\u1ea7u h\u1ebft m\u1ecdi ng\u01b0\u1eddi \u0111\u1ec1u th\u1ea5y \u0111i\u1ec1u \u0111\u00f3 th\u1eadt v\u00f4 l\u00fd. Kh\u00f4ng may thay, c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t ph\u1ea7n m\u1ec1m ph\u1ea3i \u0111\u1ed1i m\u1eb7t v\u1edbi t\u00ecnh h\u00ecnh kinh t\u1ebf c\u00f3 chi\u1ec1u h\u01b0\u1edbng x\u1ea5u hi\u1ec7n nay, t\u00ecnh tr\u1ea1ng n\u00e0y kh\u00f4ng thay \u0111\u1ed5i s\u1edbm \u0111\u01b0\u1ee3c. Th\u00e0nh th\u1eadt m\u00e0 n\u00f3i, t\u00f4i lo ng\u1ea1i kh\u1ea3 n\u0103ng t\u1ed3n t\u1ea1i c\u1ee7a c\u00e1c \u0111\u1ecbnh d\u1ea1ng m\u1edbi n\u00e0y. Ch\u00fang t\u00f4i v\u1eabn \u0111ang xem x\u00e9t kh\u1ea3 n\u0103ng t\u1ea1o ra 1 \u0111\u1ea7u ph\u00e1t \u0111a \u0111\u1ecbnh d\u1ea1ng nh\u01b0ng \u00edt nh\u1ea5t ph\u1ea3i ch\u1edd \u0111\u1ebfn khi c\u00f3 th\u1ec3 t\u1ea1o ra 1 c\u00e1i g\u00ec \u0111\u00f3 cho ra h\u1ed3n (\u00edt nh\u1ea5t l\u00e0 ph\u1ea3i \u0111\u1ea1t m\u1ee9c \u0111\u1ed9 nh\u1ea5t \u0111\u1ecbnh n\u00e0o \u0111\u00f3), ch\u00fang ta ph\u1ea3i ki\u00ean nh\u1eabn \u0111\u1ee3i th\u00f4i.<\/p>\n

\"\"

Ayre Acoustics c\u1ee7a Charles Hansen v\u00e0 Vienna Acoustic c\u1ee7a Peter Gansterer\u00a0l\u00e0 b\u1ed9 \u0111\u00f4i ph\u1ed1i gh\u00e9p \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng minh l\u00e0 kinh \u0111i\u1ec3n qua nhi\u1ec1u k\u1ef3 tri\u1ec3n l\u00e3m qu\u1ed1c t\u1ebf<\/p><\/div>\n

Ph\u00f3ng vi\u00ean: Nh\u01b0ng ngay c\u1ea3 DVD-A ho\u1eb7c SACD t\u1ed3n t\u1ea1i nh\u01b0 m\u1ed9t \u0111\u1ecbnh d\u1ea1ng th\u00edch h\u1ee3p, ch\u1eb3ng ph\u1ea3i c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t thi\u1ebft b\u1ecb hi-end audio nh\u01b0 Ayre Acoustics kh\u00f4ng ph\u1ea3i l\u00e0 n\u01a1i th\u00edch h\u1ee3p cho ch\u00fang sao? N\u00f3i c\u00e1ch kh\u00e1c, kh\u00f4ng ph\u1ea3i l\u00e0 kh\u00e1ch h\u00e0ng c\u1ee7a \u00f4ng s\u1ebd l\u00e0 nh\u1eefng ng\u01b0\u1eddi \u0111ang v\u00e0 s\u1ebd t\u00ecm ki\u1ebfm player c\u00f3 \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao hay sao?<\/strong><\/em><\/span><\/p>\n

Charlie:<\/strong>\u00a0V\u00e2ng, b\u1ea1n n\u00ean nh\u1edb Ayre v\u1ed1n \u0111\u00e3 \u0111i ti\u00ean phong trong c\u00e1c c\u00f4ng ngh\u1ec7 m\u1edbi n\u00e0y t\u1eeb \u0111\u1ea7u v\u00e0 l\u00e0 m\u1ed9t trong nh\u1eefng c\u00f4ng ty hi-end \u0111\u1ea7u ti\u00ean cho ra \u0111\u1eddi DVD player. V\u00e0 th\u00e0nh th\u1eadt m\u00e0 n\u00f3i, ch\u00fang t\u00f4i \u0111\u00e3 ngh\u0129 l\u00e0 s\u1ebd c\u00f3 l\u0169 l\u01b0\u1ee3t c\u00e1c c\u00f4ng ty kh\u00e1c theo ch\u00e2n m\u00ecnh nh\u01b0ng \u0111i\u1ec1u \u0111\u00f3 \u0111\u01a1n gi\u1ea3n v\u1eabn ch\u01b0a x\u1ea3y ra. Ch\u1ec9 c\u00f3 m\u1ed9t s\u1ed1 \u00edt c\u00e1c c\u00f4ng ty hi-end c\u00f3 DVD player, v\u00e0 m\u1ed9t s\u1ed1 trong h\u1ecd \u0111\u00e3 b\u1ecb lo\u1ea1i kh\u1ecfi cu\u1ed9c ch\u01a1i. Th\u1ef1c t\u1ebf l\u00e0 v\u00f4 c\u00f9ng kh\u00f3 kh\u0103n \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c c\u00f4ng ngh\u1ec7 n\u00e0y m\u1ed9t c\u00e1ch h\u1eefu hi\u1ec7u v\u00e0 c\u00f3 \u00fd ngh\u0129a. Gi\u1ed1ng nh\u01b0 ng\u01b0\u1eddi ta v\u1eabn th\u01b0\u1eddng n\u00f3i “N\u1ebfu d\u1ec5 d\u00e0ng th\u00ec ai ai c\u0169ng l\u00e0m \u0111\u01b0\u1ee3c r\u1ed3i!”<\/p>\n

Nh\u01b0 th\u1ebf n\u00e0y nh\u00e9, kh\u00e1ch h\u00e0ng c\u1ee7a ch\u00fang t\u00f4i th\u00edch mua m\u00e1y nghe nh\u1ea1c \u201c\u0111a \u0111\u1ecbnh d\u1ea1ng\u201d c\u1edbi ch\u1ea5t l\u01b0\u1ee3ng \u00e2m thanh tuy\u1ec7t v\u1eddi, nh\u00ecn b\u1eaft m\u1eaft c\u00f3 gi\u00e1 5.000 USD. Nh\u01b0ng khi h\u1ecd ph\u00e1t hi\u1ec7n ra n\u1ebfu chi\u1ebfc \u0111\u1ea7u ph\u00e1t 5000 $ \u0111\u00f3 c\u0169ng hay nh\u01b0 con CD player ch\u1ec9 2000 $, h\u1ecd s\u1ebd kh\u00f4ng c\u00f2n ch\u1eafc ch\u1eafn th\u1ef1c s\u1ef1 m\u00ecnh mu\u1ed1n c\u00e1i n\u00e0o. \u0110\u1ed3ng th\u1eddi, h\u1ecd s\u1ee3 chi 1 s\u1ed1 ti\u1ec1n \u0111\u00e1ng k\u1ec3 cho m\u00e1y nghe nh\u1ea1c m\u00e0 kh\u00f4ng th\u1ec3 ch\u01a1i t\u1ea5t c\u1ea3 c\u00e1c \u0111\u1ecbnh d\u1ea1ng \u0111\u01b0\u1ee3c-g\u1ecdi-l\u00e0-m\u1edbi (T\u00f4i n\u00f3i \u201c\u0111\u01b0\u1ee3c g\u1ecdi l\u00e0\u201d v\u00ec \u0111\u1ed1i v\u1edbi ri\u00eang t\u00f4i, kh\u00f4ng c\u00f3 g\u00ec ch\u1eafc l\u00e0 v\u00e0i ch\u1ee5c ho\u1eb7c th\u1eadm ch\u00ed v\u00e0i tr\u0103m t\u1ef1a \u0111\u0129a th\u1ef1c s\u1ef1 c\u00f3 th\u1ec3 t\u1ea1o th\u00e0nh m\u1ed9t \u0111\u1ecbnh d\u1ea1ng.)<\/p>\n

H\u1ecd lo s\u1ee3 n\u1ebfu s\u1ea3n ph\u1ea9m m\u1edbi \u0111\u1eaft ti\u1ec1n nh\u01b0 th\u1ebf l\u1ea1i kh\u00f4ng ch\u01a1i \u0111\u01b0\u1ee3c t\u1ea5t c\u1ea3 c\u00e1c “\u0111\u1ecbnh d\u1ea1ng” m\u1edbi th\u00ec h\u1ecd s\u1ebd g\u1eb7p r\u1eafc r\u1ed1i to! M\u1ed9t ph\u1ea7n l\u1edbn c\u1ee7a v\u1ea5n \u0111\u1ec1 n\u1eb1m \u1edf c\u00e1ch th\u1ee9c b\u00e1o ch\u00ed \u0111\u00e3 h\u00f4 h\u00e0o v\u1ec1 nh\u1eefng “\u0111\u1ecbnh d\u1ea1ng” m\u1edbi. H\u1ecd \u0111\u00e3 t\u1ea1o ra nh\u1eefng k\u1ef3 v\u1ecdng ho\u00e0n to\u00e0n sai trong t\u00e2m tr\u00ed c\u1ee7a ng\u01b0\u1eddi ti\u00eau d\u00f9ng, th\u1ed5i ph\u1ed3ng qu\u1ea3ng c\u00e1o v\u1ec1 c\u00e1c m\u00e1y nghe nh\u1ea1c \u201c\u0111a \u0111\u1ecbnh d\u1ea1ng\u201d v\u00e0 l\u00e0m th\u1ebf n\u00e0o gi\u1ea3i quy\u1ebft t\u1ea5t c\u1ea3 v\u1ea5n \u0111\u1ec1 c\u1ee7a ng\u01b0\u1eddi ti\u00eau d\u00f9ng. V\u00ed d\u1ee5, m\u1ed7i khi con chip DAC \u0111a k\u00eanh m\u1edbi \u0111\u01b0\u1ee3c ph\u00e1t h\u00e0nh l\u00e0 c\u00f3 m\u1ed9t s\u1ed1 b\u00e0i b\u00e1o h\u00f9ng h\u1ed3n tuy\u00ean b\u1ed1 s\u1eafp s\u1eeda c\u00f3 nh\u1eefng m\u00e1y nghe nh\u1ea1c \u201c\u0111a \u0111\u1ecbnh d\u1ea1ng\u201d ra l\u00f2. \u0110i\u1ec1u n\u00e0y l\u00e0 ho\u00e0n to\u00e0n sai l\u1ea7m. Gi\u1ed1ng nh\u01b0 c\u00e2u n\u00f3i “T\u00f4i c\u00f3 th\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c m\u1ed9t b\u1ed9 ch\u1ebf h\u00f2a kh\u00ed m\u1edbi t\u1eeb JC Whitney, v\u00ec v\u1eady s\u1ebd r\u1ea5t d\u1ec5 d\u00e0ng \u0111\u1ec3 l\u00e0m ra 1 chi\u1ebfc xe m\u1edbi t\u1eeb con s\u1ed1 kh\u00f4ng.”<\/p>\n

B\u00e2y gi\u1edd, n\u1ebfu b\u1ea1n mu\u1ed1n ch\u1ebf t\u1ea1o 1 m\u00e1y nghe nh\u1ea1c \u0111a \u0111\u1ecbnh d\u1ea1ng th\u1ef1c s\u1ef1, b\u1ea1n ph\u1ea3i c\u00f3 kh\u1ea3 n\u0103ng x\u1eed l\u00fd \u00e2m thanh \u0111a k\u00eanh. V\u00e0 t\u00f4i ch\u01b0a th\u1ea5y m\u1ed9t b\u00e0i vi\u1ebft n\u00e0o v\u1ec1 \u00e2m thanh \u0111a k\u00eanh ch\u1ec9 ra v\u1ea5n \u0111\u1ec1 s\u1ed1 l\u01b0\u1ee3ng so v\u1edbi ch\u1ea5t l\u01b0\u1ee3ng 1 c\u00e1ch r\u00f5 r\u00e0ng c\u1ea3. Trong d\u00e0n m\u00e1y c\u00e1 nh\u00e2n c\u1ee7a t\u00f4i, t\u00f4i c\u00f3 setup r\u1ea5t th\u00fa v\u1ecb. Speaker c\u00f3 gi\u00e1 $ 8.000 1 c\u1eb7p, \u00e2m-li kho\u1ea3ng $ 4,000, preamp kho\u1ea3ng $ 8000, v\u00e0 cu\u1ed1i c\u00f9ng l\u00e0 digital ph\u00eda tr\u01b0\u1edbc kho\u1ea3ng 8000 $ ho\u1eb7c h\u01a1n. Th\u00eam $ 6,000 chi ph\u00ed c\u00e1p, t\u1ed5ng c\u1ed9ng l\u1ea1i h\u01a1n $ 30.000. \u00c2m thanh tuy\u1ec7t v\u1eddi v\u00e0 t\u00f4i r\u1ea5t th\u00edch m\u1edf n\u00f3 \u0111\u1ec3 nghe nh\u1ea1c. Gi\u1edd n\u1ebfu mu\u1ed1n \u0111i \u0111a k\u00eanh th\u00ec t\u00f4i s\u1ebd c\u00f3 hai l\u1ef1a ch\u1ecdn. M\u1ed9t l\u00e0 t\u00f4i c\u00f3 th\u1ec3 b\u00e1n t\u1ea5t c\u1ea3 m\u1ecdi th\u1ee9 v\u00e0 d\u00e0nh m\u1ed9t kho\u1ea3n ti\u1ec1n t\u01b0\u01a1ng \u0111\u01b0\u01a1ng tr\u00ean m\u1ed9t h\u1ec7 th\u1ed1ng \u0111a k\u00eanh, ho\u1eb7c hai l\u00e0 t\u00f4i c\u00f3 th\u1ec3 th\u00eam g\u00ec v\u00e0o h\u1ec7 th\u1ed1ng hi\u1ec7n t\u1ea1i. V\u00e2ng, gi\u1ea3 \u0111\u1ecbnh r\u1eb1ng t\u00f4i mu\u1ed1n duy tr\u00ec hi\u1ec7u su\u1ea5t nh\u01b0 nhau, l\u1ef1a ch\u1ecdn th\u1ee9 hai th\u00ec qu\u1ea3 l\u00e0 phi l\u00fd. Ngay l\u1eadp t\u1ee9c, ch\u00fang t\u00f4i t\u00ecm ki\u1ebfm 1 d\u00e0n $ 30.000 g\u1ed3m \u00e2m-li, loa, v\u00e0 d\u00e2y c\u00e1p. V\u00e0 \u0111\u1ed1i v\u1edbi thi\u1ebft b\u1ecb \u0111a k\u00eanh, kh\u00f4ng c\u00f3 b\u1ea5t c\u1ee9 c\u00e1i n\u00e0o c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c hi\u1ec7u su\u1ea5t nh\u01b0 pre-amp v\u00e0 m\u00e1y nghe nh\u1ea1c c\u1ee7a t\u00f4i \u0111\u01b0\u1ee3c, b\u1ea5t k\u1ec3 gi\u00e1 c\u1ea3. V\u00e0 th\u1eadm ch\u00ed gi\u1ea3 \u0111\u1ecbnh r\u1eb1ng nh\u00e0 t\u00f4i c\u00f3 \u0111\u1ee7 ch\u1ed7 cho t\u1ea5t c\u1ea3 c\u00e1c thi\u1ebft b\u1ecb \u0111\u00f3 trong khi s\u1ef1 th\u1eadt l\u00e0 kh\u00f4ng!<\/p>\n

S\u1ef1 l\u1ef1a ch\u1ecdn kh\u00e1c l\u00e0 s\u1ebd downgrade (h\u1ea1 c\u1ea5p xu\u1ed1ng) m\u00e0 v\u1eabn gi\u1eef to\u00e0n b\u1ed9 \u0111\u1ea7u t\u01b0. C\u00f3 ai c\u00f3 th\u1ec3 nh\u00ecn v\u00e0o m\u1eaft t\u00f4i, nghi\u00eam t\u00fac n\u00f3i v\u1edbi t\u00f4i r\u1eb1ng \u201cT\u00f4i s\u1ebd h\u1ea1nh ph\u00fac n\u1ebfu \u0111\u1ed5i 2 loa $ 4000 th\u00e0nh 6 loa $ 1200?\u201d T\u00f4i kh\u00f4ng ngh\u0129 v\u1eady \u0111\u00e2u. T\u00f4i nh\u1edb h\u1ed3i t\u00f4i c\u00f3 loa gi\u00e1 $ 1200, th\u1eb3ng th\u1eafn m\u00e0 n\u00f3i t\u00f4i r\u1ea5t mu\u1ed1n n\u00e2ng c\u1ea5p loa c\u1ee7a m\u00ecnh l\u00ean th\u00ec hu\u1ed1ng chi l\u00e0 h\u1ea1 xu\u1ed1ng. V\u1eabn kh\u00f4ng r\u00f5 r\u00e0ng li\u1ec7u \u0111\u1ecbnh d\u1ea1ng c\u00f3 t\u1ed3n t\u1ea1i kh\u00f4ng. M\u1ed9t s\u1ed1 ng\u01b0\u1eddi n\u00f3i r\u1eb1ng ch\u00fang \u0111\u00e3 \u201cch\u1ebft\u201d.<\/p>\n

N\u1ebfu kh\u00f4ng c\u00f3 h\u00e0ng ng\u00e0n, ho\u1eb7c t\u1ed1t h\u01a1n l\u00e0 h\u00e0ng ch\u1ee5c ng\u00e0n t\u1ef1a \u0111\u0129a, t\u00f4i kh\u00f4ng ngh\u0129 b\u1ea1n th\u1ef1c s\u1ef1 c\u00f3 nhi\u1ec1u. V\u1ea5n \u0111\u1ec1 l\u00e0 kh\u00f4ng th\u1ef1c s\u1ef1 c\u00f3 b\u1ea5t k\u1ef3 khuy\u1ebfn kh\u00edch n\u00e0o cho c\u00e1c c\u00f4ng ty ph\u1ea7n m\u1ec1m l\u00e0m t\u1ef1a \u0111\u0129a m\u1edbi. V\u00ec v\u1eady nh\u01b0 t\u00f4i \u0111\u00e3 n\u00f3i, ch\u00fang t\u00f4i s\u1ebd ti\u1ebfp t\u1ee5c theo d\u00f5i v\u00e0 ch\u1edf \u0111\u1ee3i; M\u1ed9t khi ch\u00fang t\u00f4i c\u00f3 th\u1ec3 ch\u1ebf t\u1ea1o m\u1ed9t c\u00e1i g\u00ec \u0111\u00f3 c\u00f3 \u00fd ngh\u0129a, ch\u00fang t\u00f4i s\u1ebd l\u00e0m. Nh\u01b0ng gi\u1eefa c\u00e1c ph\u01b0\u01a1ng h\u01b0\u1edbng th\u00ec ph\u1ea7n l\u1edbn Nh\u1eadt B\u1ea3n \u0111ang \u0111i theo nh\u1eefng \u0111\u1ecbnh d\u1ea1ng m\u1edbi v\u1edbi s\u1ef1 mong \u0111\u1ee3i \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1edfi b\u00e1o ch\u00ed, ch\u00fang t\u00f4i \u2013 nh\u1eefng nh\u00e0 s\u1ea3n xu\u1ea5t c\u00f3 vi\u1ec7c \u0111\u1ec3 l\u00e0m \u0111\u01b0\u1ee3c v\u1ea1ch ra tr\u01b0\u1edbc r\u1ed3i \u0111\u1ea5y. Nh\u01b0ng, hey, \u0111\u00f3 l\u00e0 c\u00f4ng vi\u1ec7c c\u1ee7a ch\u00fang t\u00f4i v\u00ec v\u1eady t\u00f4i kh\u00f4ng th\u1ec3 ph\u00e0n n\u00e0n qu\u00e1 nhi\u1ec1u! B\u00ean c\u1ea1nh \u0111\u00f3, hi\u1ec7n nay t\u00f4i \u0111\u00e3 c\u00f3 \u00fd t\u01b0\u1edfng cho m\u00e1y nghe nh\u1ea1c m\u1edbi\u2026<\/p>\n

Charlie, c\u00e1m \u01a1n \u00f4ng \u0111\u00e3 d\u00e0nh th\u1eddi gian cho bu\u1ed5i tr\u00f2 chuy\u1ec7n. T\u00f4i ngh\u0129 c\u00e1c \u0111\u1ed9c gi\u1ea3 c\u00f3 nhi\u1ec1u \u0111i\u1ec1u th\u00fa v\u1ecb \u0111\u1ec3 suy ng\u1eabm r\u1ed3i \u0111\u1ea5y!<\/strong><\/em><\/span><\/p>\n

Ngu\u1ed3n: Audio Perfectionist Journal
\nD\u1ecbch: Minh Ch\u00e2u – Hifivietnam.vn<\/strong><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

HFVN – M\u1ed9t trong nh\u1eefng l\u1ee3i \u00edch l\u1edbn nh\u1ea5t khi l\u00e0m vi\u1ec7c trong ng\u00e0nh hi-fi \u0111\u00f3 ch\u00ednh l\u00e0 c\u00f3 c\u01a1 h\u1ed9i \u0111\u01b0\u1ee3c g\u1eb7p nh\u1eefng con ng\u01b0\u1eddi t\u00e0i n\u0103ng v\u00e0 th\u00fa v\u1ecb – nh\u1eefng nh\u00e0 thi\u1ebft k\u1ebf thi\u1ebft k\u1ebf ra c\u00e1c s\u1ea3n ph\u1ea9m mang \u0111\u1ebfn \u201cs\u1ef1 th\u1ecfa m\u00e3n \u00e2m nh\u1ea1c\u2019 cho c\u00f4ng ch\u00fang y\u00eau nh\u1ea1c. Th\u00f4ng…<\/p>\n","protected":false},"author":1,"featured_media":1798,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":[]},"categories":[12,15],"tags":[644],"class_list":["post-1797","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-danh-gia-review","category-tin-tuc","tag-ayre-acoustics","category-12","category-15","description-off"],"jetpack_publicize_connections":[],"yoast_head":"\nPh\u1ecfng v\u1ea5n Charles Hansen - Ch\u1ee7 t\u1ecbch h\u00e3ng Ayre Acoustics - SaigonStereo<\/title>\n<meta name=\"description\" content=\"V\u1edbi thi\u1ebft b\u1ecb c\u1ee7a Ayre Acoustics, khi b\u1ea1n \u0111\u01b0a v\u00e0o m\u1ed9t b\u1ea3n recording tuy\u1ec7t v\u1eddi, t\u1ea5t nhi\u00ean \u00e2m thanh s\u1ebd tuy\u1ec7t v\u1eddi. 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