Well, finally got around to testing out my 2 10s and mtx amp that i got from my brother who had them in his stang many years ago and was just sitting around. well we tested them months ago on a power supply in the garage, threw a boombox/radio and it was working with the amp and all. Tonight when we were testing it out this time we used the truck and the batttery along with the wires i got in the back of the radio it was acting funny. we taped into the rear speakers and then to the HI IMPUT on the amp and sometimes the radio sound wouldnt play threw any speakers in the truck or the sub. that was even with the amp on ground but not power and hoooked to the speaker. could the amp be fried or what gives?