I had an amp hooked up to my subs with everything working just fine. Just got myself a new amp and simply transferred the wires from the old to the new one but for some reason the amp does not turn on. I took it out and put the old one back in and it works just fine. I also tested the new one in a friend's set up and amp worked tip top. Not sure what the problem could be. The old amp is an SSL Evolution EV2. 1000 and the new one is a Crunch PZi 1500.1.