I put a system in today and the kid already had a sony cd player and he didnt want to buy another one so we used it. Anyway the amp is a JBL GTO 600.1 and the subs are kicker CVRs. The problem is at high volumes the sound cuts out, not just the subs but the speakers and everything. The gain on the amp is set at 1/4 or less so whats the problem here guys?