I feel silly askin but...when hookin 1 amp to another is it just as simple as gettin another RCA and stickin it in the 1st amp's pre-out nd stickin it into the 2nd amps in-put and away you go?????
If it's 2 sub amps, just run a set of rcas from the original amps out to the 2nd amps in. If it's for 4channel I'd get some new rcas and run from the front.
just a heads up considering noones mentioned it not even the poster. but u also need a distro block to add power to the new amp.like was mentioned u go from amp to amp not from the hu after its hooked to the first amp.