Help shooting really odd engine noise...

So I've got a noise that suddenly come through my system and I can't figure out what is causing it. I'm familiar with troubleshooting engine noise and whatnot, I've tracked down an alternator whine in the past. Here's the deal.

First noticed it about 2 days ago, and I've had my system installed since January. Just a higher pitched noise coming through the front components, moreso the tweeters though. It does it very very minimally when the car ignition is in the acc or radio only position, as in you have to put your ear right next to the tweeter to hear it. This may just in fact be the noise floor of the system, but it's negligible either way. When you turn the ignition to the position like you are going to crank the car (but you don't), it gets louder and easily noticeable. If I do crank the car it does not go up and down in pitch with the revs of the engine like it was the alternator. The noise also doesn't get louder when I turn up the volume, whether the car is running or not. It's just a consistent level buzz.

Here's the odd thing - I can push on one corner of the dash kit trim or another, or wiggle the main part of the kit the radio is in, and it goes away, OR comes back/gets louder again. I can also take the trim off the kit, where I can reach in and move the wires around with my fingers, and the same thing happens. Wiggle it a bit one way, goes away or gets quiet, wiggles a bit more, comes back. I did take the deck out and check, all connections from the deck (Pioneer PRS 800) and to the RCA's, power, remote, blah blah are all solid.

My initial thinking is that maybe some wires in the back are touching the case of deck and some metal back there maybe? That roll bar like cross brace is right behind the radio.

Any other suggestions or thoughts would be REALLY appreciated. Granted I haven't had tons of time to spend on it yet b/c of work, but any idea to initially chase down would help. Thanks!