Listen to this, I bought this amp brand new off of an ebay seller. I received the package and it looked good, so I kept it. I just had it installed today, and when the guy first hooked it up it was hitting madd hard, and then when he shut the trunk it went off. So I tried for 2 hours to try and get it back on and only the slave RCA connecter works sometimes. So as I drove home, it was just hitting alittle bit, just highs, nothing would work not even the gain knob for the amp. In my drive way we started messing with the manual gain knob on the amp, and just unplugging everything and all of the sudden it started working fine, I mean it was really nice. Then I shut my car off and eat dinner, came back out and it wont work now. Everyone is saying it is the amp that is messed up, do you think that is the case? I believe that the wiring is good so I think the problem is the amp. If anyone knows anything please reply, thanks.