Originally Posted by JHAz
Generally hiss, at least as I think of it, should be filtered out by the low pass to the sub, presumably fromvthe main receiver's basd managrment. What is your sub crosdover frequency? But if the receiver channel in the second receiver has a bunch of intrinsic noise the first receiver's crossover won't eliminate it.
That's correct, and the filter is set that way. LFE+Main crossover is set to 80hz, which is what will be output go to the main receiver's sub preamp out, which should be the only signal sent to the subwoofer amp.
I also tried cutting all the frequencies above 125hz on the subwoofer amp and it makes no difference. If I change the input on the subwoofer amp to another input then the hiss is gone. I plugged my ipod into one of the inputs and the output to the sub was clean on that input.