subs rockford

I just installed a new box for my friend. When I went to tune his amp for him, I noticed that his subs were moving out of sync, and one was moving a little bit faster than the other one. The subs are two Rockford P3's and the amp is a Rockford P1000-1bd. Both subs are dual-4 ohm wired down to 1...

well I have a Rockford fosgate t1000.1bd and its under the seat of my truck 1/2 inch off the carpet with a crossflow fan behind it for heat. 2 days ago the subs started making this loud buzzing noise like REALLY loud which had nothing to do with the volume, and im pretty positive its not the...