I believe this is what he is talking about:Loud3...Do you have any more info on those.
I believe this is what he is talking about:http://cgi.ebay.com/UNIVERSAL-RCA-LINE-LEVEL-BASS-GAIN-CONTROL-KNOB-FOR-AMP_W0QQitemZ5824864686QQcategoryZ50552QQrdZ1QQcmdZViewItem