stereo keeps turning off

isa423

street freaks
i got my 95 LS not to long ago and it came with a pioneer aftermarket head unit and a pair of sony speakers in the rear. when i turn up the volume up to a certain point it seems like the bass is so much that the whole stereo turns off for some reason. i thought it was because there is so much power being used between the head unit and the rear speakers. now i just got a 4 channel 1400 watt amp and i hooked it up and the stereo keeps truning off. just wanna see if anyone can help me out to see whats my problem and secondly help me out with this.
 
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