I was told by REL and Marantz to connect the black to your amps ground/
Red to right positive, Yellow to left positive and Black to the amps chassis ground.
Im doing it that way on a PM-10 and did so on the PM-KI Ruby.
Marantz PM 10 to Subwoofer
I have a Focal Sub 300p that I would like connected to my Marantz PM 10.
i know the only way to connect it is by using the high level inputs/outputs on the sub.
What I don’t know is if the bridged class D amp in the pm 10 has real minus posts or if they are active.