Problems with OPA549/LM833 and static

I'm having problems with my subwoofer built with a bridged OPA549 and a LM833 for crosoover.

It's part of a 2.1 system rebuilt using a broken set of z-680 speakers. Ever since adding the LM3886 chips for the satellite speakers, I've been noticing the output from it a constant static sound that sounds like the input but with static in the sub, but it is only audible at lower volumes.

Is this just a sign my 100W transformers are crapping out with the load (like the other problem I have where the thing runs out of power and the 3886s start making some odd popping sound that goes away once the amp starts clipping), but I don't see how the power of a transformer would cause this odd static.