Rel R-505 work with a Pass Labs X350.5

Some powered subwoofers require an audio signal ground reference and their makers may suggest that a black speaker terminal is where this voltage reference might be found. On complementary designs, which would be typical of all power amps produced by Pass Laborato- riesTM, this is an incorrect and unsafe assumption. On all Pass Labo- My present amp is a Mcintosh 402 Magnepan 3.7