brylandgoodman
Just use the Rel supplied cables.
l started with one Rel Quake in 2004 and later went stereo pair as they were so good. Now using a pair of T9i’s. I dabbled a little with hi in and low in and use hi for hi-fi and low for multi-channel HT.
The Nuetrik connection is the wise route as the sub will adopt your amplifiers signature sound/timing and not add anything else. A good secure connection that will not pull out if experimenting your placement.