i have an Eclipse AVN7000 head unit and i have a MA audio amp hooked up to a Solo X 10". the problem i am having is that it is send a weak signal to the amp and only playing at about 1/3 the volume but every now and then it will play at full volume. the speakers in side the car work fine. i tried using a different amp and i had the same problem. anyone have any ideas on what could be causing this?

Thanks