headphone preamps, suddenly no bass?

[Michael Zacherl]

guys, you may be right! I remember this annoying cklick when un/plugging 
  the phones. Gotta go - thx, I#ll check that too - c u later!  :-) Michael.

On 07.12.2007 16:03 Uhr, Tony Hardie-Bick wrote:
> Chris Strellis wrote:
> 
>> Just a thought, is any one channel (L or R) worse than the other?  I'd be
>> surprised both caps would have gone the same way.  Do you hear any big clicks
>> when you plug in the headphones or input sources.  This would indicate a DC
>> offset.
> 
> In any amp out, a DC offset is likely to reduce the bass response in headphones. 
>   Like Chris says - you'd hear a click when you plug them in. Failing this, just 
> inject some white noise, probe various parts of the amp circuit with a 
> connection to an FFT application, and find out where in the circuit the bass 
> response starts to roll off. Feedback network is the other thing that springs to 
> mind (an electrolytic is sometimes used in series with one of the gain-setting 
> resistors), but not if both channels are affected equally (that would indicate 
> something simple, too obvious to notice, and probably nothing to do with the amp).
> 
> Check with several pairs of headphones first.
> 
> Tony (HB)
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