try putting the rcas on the "f" or "r" on the head unit just to test...... if that doesnt work, take a new pair of rcas and just go straight to the amp, without hiding anything..... that shout cover any questions with rcas...... if nothing is changing there, try taking a drill battery and putting the speaker wire from the subs on the battery to "pop" them, if they dont pop then the speakers are bad.... if they do pop, then its probably the speaker output on the amp......