Yeah running a hifonics at a hlf ohm, is not a good thing. Sounds like you need to get a .5 stable amp, or something at 2 ohms. Hifonics amps are decent budget amps, thats what I have for now. Car Audio can be hard to troubleshoot sometimes, but never blame the maker until you know its not your fault. And if you sent it in for a recone, 99% of the time they can tell if its abuse.