I am perplexed and am hoping that someone might be able to help out.
I am getting random distortion coming through my powered sub woofer. I originally thought this had to do with my amp, interconnects or line conditioner but have eliminated all those by testing several combinations.
I am able to reproduce this on two different powered sub woofers and two different amps and with several different interconnects (XLR. etc) .
I get this noise on both subs and when they are plugged in to a line conditioner or directly into the wall - with nothing else connected to the sub. This tells me its not amp, component or interconnect related.
I can reproduce it on different AC outlets including those with GFIs and on different circuits in the home.
The sound is nearly always the same. It is not a hum or high level popping but more of a low level garble, generally starting out slow then at times building in intensity and volume. Almost sounds like something is loading up. When I turn the power off of the sub it goes away.
One of my subs is a Sunfire Tru-EQ. I called support to see if they might have any ideas. They thought a Audio Insulation Transformer might be something to try but from what I am reading these seem to address ground loops. Any thoughts on these?
I would assume my APC line conditioner with battery backup would regulate power well enough to address AC power issues and I dont think this is a ground loop issue because it is not a hum.
Can this be some kind of radio frequency interruption?
Any ideas on what it might be, what to test next, how to make it go away?