okay, so i have an entry level pioneer(not sure on the model) and im driving the other day, and everything is fine, then all of a sudden my subs cut out. after further investigation i find that if i pull the rca's out of the amp it goes off of protect mode, so naturally i try a new pair of rca's, and same thing happens. so, then i try another amp, that i know works, but same thing, it goes into protect mode, until the rca's are pulled out. could the rcs line out on the h/u have fried? what else should i be looking at here? all the other speakers are on and functional except subs.....any help is greatly appreciated.