I gotta 1200w sony amp kickin 250 rms at 2 channels. I got 2 comp kickers they are 400 rms. My problem is that I got it hooked up where each speaker is at its own channel, the amp is bridgable so I bridged both speakers (cause the bass is better inside and there's no rattling at the front doors) and when I turn it up the speakers cut off and the amp goes into protection mode, why is this?