音響調聲學 - 喇叭
By Puput
at 2013-09-17T01:45
at 2013-09-17T01:45
Table of Contents
劉老的那本書看看就好,一定要對內容抱持懷疑的態度。
因為他這本書比較像經驗分享,
書裡有些東西跟理論根本是錯的或者沒講清楚。
只抓到裡頭一兩句話就當作真理,有時候會變成像用內行話包裝的外行話,
這不是好事。
一開始的樂器音域表(嚴格說一開始應該是一大堆比他雜誌還多的廣告)其實很雞肋,
為什麼?因為只有這張表對調音根本無用。
分辨樂器音色的重點在於諧波的結構,基頻不是重點。
例如同樣的La=440Hz,
因為人聲跟鋼琴的二次諧波較高,簧片類的奇次諧波較高,
所以如果把880Hz左右拉高,那人聲跟鋼琴就會比較好一點,
boost 440*3 Hz,則簧片類的樂器聲音會比較清楚。
只放一張樂器音域表,我猜劉老要不懶得寫這些後話,不然就是不懂。
另外關於大瓦數、阻尼因數、OPT這些東西,
劉老也寫得太簡單了,名詞很多,但是根本沒有內容。
他不會告訴你大瓦數會需要高耐壓的濾波電容,
同一品牌型號的高耐壓高容質電解電容有可能代表更多的漏電流,
所以聲音會比較粗,沒有質感。
阻尼因數其實就是要擴大機的輸出阻抗越小越好,
可以靠降低射級電阻阻值跟並聯晶體,但是會有線路不穩定跟晶體配對問題。
OPT對阻抗匹配有幫助,但是OPT會發熱,所以做不到大瓦數,
瓦數不夠,就只能靠高靈敏度喇叭去撐所謂的控制力。
少了這些可能要考慮的東西,一些觀點其實只在某些特定狀況下是true,
遇到例外,音響迷一般都有很多說詞可以自圓其說,
ex.沒高沒低叫做中頻很好,推力不足叫做適合小編制。
反正劉老這本書建議當經驗談來看,要像書名音響調聲學一樣當作是理論,
有很大的機會是在誤人子弟。
--
轉盤: Usher CD-1
De-jitter: KECES Digibox
DAC: 交直流DAC180.3; KECES DAC1793
前級: 交直流Chanson; 交直流Jazz; KECES E88CC
後級: 小金剛三代; DIY research JC-3; LM3875; LM4780; TDA7293
喇叭: Dynaudio Confidence3; Usher S-520
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All Comments
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at 2013-09-20T13:31
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