you usually have to make one the master and the other a slave. the slave amp would have to run 180 out of Phase. on my amps i have to bridge the negs together, (amp to amp) then pos on the master goes to pos on woofer and pos on the slave goes to neg on woofer.
hum can explain a little more ? are you telling me that you conected the amps together via the speaker outlets?
ya, one of my amps has to run 180 degrees out of phase. then link the -speaker out. and then the +on amp #1 is + on the sub and + on amp #2 becomes - to sub because it runs out of phase
^ That works on some monoblocks. The MS275 is not a monoblock.
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