i'm looking at getting two SSD's 12" subs and already know about the kicker zx1500.1 but wanted to know if there are any other subs that will do the job at a lower price? and the rms is 1600 and has 2ohms. I have heard that the rms from the amp needs to be only 75% of the rms that the sub needs is that true? would 1000 rms be enough for the two subs?