I had the same experience with REL high level connections, whether a single sub or two subs. The hum was only apparent when no music was being, but still annoying. I then purchased a KEF KC62 and connected left and right channels from my preamp out jacks. No hum and more bass to boot.
REL Hum. Stumped
I’m getting a hum from both my REL subs. The strange thing is the subs don’t even need to be connected to the Luxman integrated to hum. All I have to do to get them to hum is plug in the Speakon connector. If I disconnect the Speakon at the sub the hum stops.
Connecting the high level wires at the amp doesn’t stop the hum;
nor does connecting the black wire to the amps grounding lug.
nor does running an RCA from an input on amp to the unused LFE input on sub
nor does using HumX to lift the ground
nor does changing outlets
nor does using the same outlet as the amp
nor does using a isolation transformer
Btw the amp doesn’t even have to plugged in and I get the hum!
Im lost, any thoughts on what I should try next.