I have a stewart pr 1000 poweramp. I tried it tonight bridged at 1000w 4ohms and also with one channel 350w @ 4ohms with my schroeder mini 12+ (4ohms). Though 1000w was louder than 350w it sure didnt seem like over double the volume to me. I think i read on TB that if you have 100w you would need 1000w to double the volume. That seems true. So aside from the headroom issue, does it really matter if you have 400 or 700 watts if the volume difference is negligible? Or is headroom the only issue?