check the back of your deck, the wiring seems to be wrong. the av cables from your amp (red and black , maybe red and white) should be coming from the amp to a rear sub output. was your system working before? if so then your subs are blown. if not dont turn the volume up to high because mids and highs can make your subs blow. you amp is fine if it make sound go through to the amps. check your wiring. on your amp make sure the filter is set to lows and basically just check the way your wiring is set up. the problem is either in the wiring or your subs
good luck
if you have any other questions ask away.. let me know how it turns out