Wolf. The speakon cable is a different animal for sure. I had trouble with a hum at first. But it didn’t sound like a ground loop because it increase in volume with a volume increase of the sub. I finally found the fix on the Rel site. They suggested tying off the black (ground) cable and using an RCA cable plugged into an unused jack on the back of my preamp which grounds the sub. it worked like a charm. The only complaint I have is that the volume & crossover dial has no detents which would help in setting volume/crossover with more precision. This is a minor complaint though and should not stop anyone from buying/owning one of these
BTW, these subs are discontinued due to the fact that Sonus Faber will be making these from now on
BTW, these subs are discontinued due to the fact that Sonus Faber will be making these from now on