Are there no transformers on your audio console? 
Even my crappy little 1980 'Sparta 15' has transformers on all line inputs.

AP


>>> Good old Western Elec coils on to a switcher board that is right before the 
>>> card. 
> 
>>> ... the M-Audio Delta cards - a need to put isolation transformers in the 
>>> audio lines to get a clean sound.
> 
>>> When he installed the cards in his production room he had hum on his record 
>>> inputs at -45 dB or 
> so ... so we added Western Electric 111C coils.
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