RA280 high level connection to subwoofer - Black wire

User Tips
#1

I want to connect my subwoofer using its High-Level connection with a Speakon cable, but I’m unsure whether the black wire should go to the RA280’s ground or to the negative terminal of one of the speakers.

I’ve heard that many Class D amplifiers don’t share a common ground on their negative terminals; instead, both terminals (positive and negative) carry active voltage with respect to chassis ground. Connecting the subwoofer’s black ground wire to a live negative terminal will cause a short circuit that could damage the Rose RA280’s GaN FET amplifier modules.

#2

It sounds like you have a REL subwoofer.

You put the black wire on the Ground screw.
REL has some documentation on this.

#3

I have a Sonus Faber subwoofer Gravis II.
Thanks so much!

#4

Ok,
I have the REL which has Black, Yellow and Red wires to a Speakon connector.

Per REL the red to the right positive, Yellow to the Left positive then black to the ground.

However… you should check w your manufacturer’s information as it could be different.

#5

Thanks. Rel and Sonus Faber share the same technology.