[Wayne A. Pflughaupt]

Blaser,

Not to discount anything Ilkka said (since he’s used your amp and I haven’t), but typically here when we’ve seen noise problems like you describe, its been caused by going overboard with cutting filters on the equalizer. While the typical home receiver has a maximum output level of only 1.25 Vrms, a good pro amp can handle input signals up to 14 Vrms. Severely reducing an already low signal via equalizing and sending it to a component that wants a hot signal level is a sure recipe for noise.

OK, the problem was due to some grounding problem in the amps, but the increasing or decreasing the overall output of the BFD by the method I described above (applied +3 db at 25.9 Hz with the widest Q of the BFD 2496) would propably cure the input clipping problems.

...except that using the equalizer as a level-matching device is really poor form. Its desigated purpose is for smoothing response.

Regards,
Wayne