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i now have two amps powering my two subbs. wen i wired my first amp up it powerd both subbs perfect,, but about 500watts underpowerrd. so im now running two amps, both bridging my subbs. the new amp i have wired up is dojey tho. the subb i connected it two makes a heartbeating sound when there is no sond or music coming through:O can anyone help me out. and do you know what i mean..bcus ts well annoying wen every 2 seconds theres a load thud off bass about 800 watts going throgh you, even when the music is on.

have you used the same wire routing for both subs? sounds like a bad earth to me. check your earths mate.

bad earth. ok ill try sort it out. only one amp does it u see. but the power seems good so the earth would make the power flicker on and off wouldnt it :S