i have a peavey max700 running two 4 ohm cabs for a total 2 ohm load at 700w rms. is it possible to add an external power amp as a slave? the peavey max700 has a pre-amp out jack that looks like it can do something like that. the cabs are avatar 4x10(1200w) and 1x15(600w) so would this be the right way to run it? bass-->max700-->power amp-->cabs? does the power amp need to be bridged or in stereo?