I have a JBL GTQ400 amplifier that is in used condition with an almost new amplifier hookup kit (I think it is a Scosche). It's a really nice kit. The amp is 75 watts by 4 and has some serious Power (underrated amp). It was working perfect before I took it out but I cannot make any guarantees aside from this. I was using all four channels and output was similar from all. I want to get $150 shipped for it, or $125 plus shipping. I'm thinking shipping will be $25 for all of this because of the heavy weight of it all.