Hey polecat, I had a question... the store i work at , we had 3 kx 350.4 amplifiers. All three of these amps were messed up out of the box. When you plug in the front two rcas, all 4 speakers were playin the audio. When we proceeded to plug in the rear rca inputs, we reciever a hellacious road noise out of the rear speakers only. Went through all three amps and had the same problem. Then we plugged in an mtx amp, and everything worked fine, then we used a sony...and so on, and all of them worked fine. So we had to defect out all those kicker amps. Have you heard of this problem before, or had anything like that on any of your other kicker amps? Just a question, anyone can answer if they know the answer.