Hi, I need help connecting my Pass 150.8 to my REL B3 subwoofer, using the standard REL cable (with 1 red/+, 1 yellow/+, and 1 black/- wire). A buddy suggested I connect the red and yellow REL cable wires to the red/+ speaker binding post in each channel of the Pass (as usual), but then to connect the black REL cable wire (the ground) to the GROUND SCREW on the back of the Pass rather than to one of the two black speaker binding posts on the back of the Pass - is this correct? Normally, I connect the black REL cable wire to one of the two black speaker binding posts on the back of my other amp, so am wondering why we are to use the ground screw on the back of the Pass instead of a black speaker binding post. My second question concerns the speaker level connection from the Pass into the back of the REL; the sub uses Neutrik connectors and there are two options - one for "unbalanced" which I have been using, and the other for "balanced", which, from the manual, is not related to whether the upstream electronics are balanced or not, but rather it seems to mean whether the amplifier is a 'differential' design - do I just use the regular "unbalanced" high level input from the Pass 150.8 into the REL B3? The Pass seems to be a somewhat unusual design, hence the odd way of connecting that black/ground REL cable to the Pass, but now I am wondering if the Pass is a 'differential' amplifier and that I should be using the "balanced" speaker level input. Thank you for taking the time to read this message - sorry it is so long - happy Holidays!