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Featured Topic View Post: DIY Workshop » β22: A discrete, cascoded, fully complementary, pure class A amplifier (part 3)
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amb


Headphone Council

Joined: Apr. 1, 2004
Locale: Sunnyvale, CA. USA
Total Posts: 4408

 posted 08-08-2008 09:42 PM CST (US)   View Profile for amb   Send PM to amb   |  Edit Message  |  Quote Message in Reply
audio nut, it would appear that the voltage gain of the amp(s) are two high for these particular Denon headphones. The default gain of β22 is 8 and CKČIII is 9, which are good for a large number of headphones, but your headphones are probably too sensitive. Lowering the gain to 5 or even 2 should take care of the hiss. See the Parts list section of both amps' websites for info about what parts to change.
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