I am not totally sure that the amps in the mach 460 power only the mids, I think they power both speakers, as a component set. I could be wrong on that, but it seems to me that if the amp has gone bad then you wouldnt get any sound out of that set of speakers. You may want to take it to a sound shop or a place like best buy (at last resort) and have them test the amp on a set of speakers, just to see if its your amp or your speakers.