@ryedady
Are you trying to run cables from the rca outputs of your Luxman/McCormack to the 1/4" inputs of the bgm? If so, there is probably an impedance or signal level mismatch. 1/4" sockets are usually intended for microphone or electric instrument connections. Such sockets are fairly sensitive because the intended instruments emit a weak signal (about 50 millivolts). Line level RCA outputs from stereo pre amps usually output a considerably higher voltage. With the subwoofer disconnected, have you tried to play any source material through the bmg amp?
Are you trying to run cables from the rca outputs of your Luxman/McCormack to the 1/4" inputs of the bgm? If so, there is probably an impedance or signal level mismatch. 1/4" sockets are usually intended for microphone or electric instrument connections. Such sockets are fairly sensitive because the intended instruments emit a weak signal (about 50 millivolts). Line level RCA outputs from stereo pre amps usually output a considerably higher voltage. With the subwoofer disconnected, have you tried to play any source material through the bmg amp?