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I'd suspect airborne electromagnetic interference entering the system through an insufficiently shielded cable; or cable(s) routed too close to power cords or magnetic fields; or a flaky track lighing fader control.
Maybe you could name the subwoofer model so we know what it needs for input.
And we need to be careful with the indiscriminate use of the word 'power' in audio discussions. There's wall power and there's amplifier (audio) power.
In the case of subwoofers, some are self-powered (AC power cord plugged into the wall and an amplifier built-in; usually receives subwoofer-specific audio program via RCA cables from YOUR source); others are passive (just get audio power from YOUR amplifier.
well yes there is a way to switch to six ohm standard go to pioneer website download a free digital copy of your manual and therin it will show you how to change settings i love my pioneer by the way it rocks
ok my friend y know you love it dont worry most experience tech can solve your problem the technician has to change the old filters cause they dried up and resold some points on your amp cause the time and the weather dust affect the impress circuit...........
I found the source of my hum. I have Direct TV HD. I found that going into the menu settings (Direct tv HD Receiver) /Audio/Sound Effects and turning that option off, I was able to rid myself of the annoying hum. The option has something to do with keeping the audio settings from channel to channel, while it is changing you hear dead air except for the hum. Nice and quit now. Love this receiver!
one of the possibble cause could be the so called bad (cold) soldering in display area. If you have some technical background maybe you can do it at home.
Otherwise please call the pro.
If you need more help please advice