Polk db6501 help!

Astrosfan

I recently installed the polk components and after getting the car back from the body shop, the drivers side has a buzz/vibrate on certain frequencies. I cant tell if its the speaker or door panel. it doesnt sound quite like distortion.

Also, i used the speaker wires that came with the polks to wire the speakers to the xover and new wire for the rest, while tapping into the factory wiring the rest since i still have the stock HU

any ideas as to what the buzz could be? its very irritating.