Power Acoustik PTID-8960 Car Video Player "subwoofer thumps turn" Questions

subwoofer, 1 amp to the rear deck speakers, and 1 amp to two-subwoofers. When I power up the head unit, the rear deck speakers and two-subwoofers thump and the deck speakers thump and crack...........

screehing sound coming out of all speakers ok, i got into my car and turned it on and this loud annoying sound came out of all my speakers and tweaters and my subwoofers were thumping out of control ...