I have a pioneer head unit and the adapter for the jbl wires . I put the head unit in and the rear speakers barely have sound. I also have 2 kenwood amps, I think 150w with 2 12"s. I was going to run separate wires to the speakers to bypass the amp. Can I use the kenwood amps to power the speakers with full sound .I tried them on one speaker and it was just low sounds, but the amps are bridged. Could this be the problem, I havent used this system in 5 years. If someone could give me a little radio 101.