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RE: " Running 25 ft cables could be part of the problem with your preamp" ...

DC offset is easy to measure and can cause huge problems. Most a/v enthusiasts are unaware of it. Just disconnect the speakers, and measure DC volts @ speaker connection on the amp while turned on, nothing playing. Anything other than 0 is DC offset. up to 100mV is okay, but under 25 or so is best. Issue can be in amp or anything upstream. i.e. if the source or pre-amp is sending anything other than 0mV when it's supposed to be silent, the amp will amplify that as well.

My amps range from 0-15mv, to about 120mV on an old Yamaha integrated.


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