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發表於 2012-11-26 14:24:24
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本帖最後由 racewong 於 2012-11-26 14:37 編輯
jj338 發表於 2012-11-26 13:43 
應該唔關class A的事,從綱上的討論區了解到因Pass labs後級嘅輸入阻抗是非常低 ,得20Kohms(balance)所以 ...
PASSLABS XA100.5
Input Impedance,(Kohms) 30 / 20,
Gain (db) 26
ARC REF.250
Input Impedance 係200Kohms,
INPUT SENSITIVITY: 2.4V RMS Balanced for rated output. (25.5 dB gain into 8 ohms.)
ARC REF.150
Input Impedance 係300Kohms,
INPUT SENSITIVITY: 2.0V RMS BAL for rated output. (24 dB Bal gain into 8 ohms.)
krell evo 400 mono
Balanced: 200 kΩ
Single-ended or balanced: 3.04 V RMS. Gain 25.4
krell evo 600 mono
Balanced: 200 kΩ
Single-ended or balanced: 3.72 V RMS. GAIN 25.4
其實我想問好耐, 大家一齊討論吓啦.
以ARC, KRELL既後級為例, 同一系列, 唔同MODEL既InPUT IMPEDANCE / INPUT SENSITIVITY都會唔同.
咁咪好難去配前級囉.
如果只睇SPEC, 真係頭都痛埋呀!!
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