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In Reply to: RE: Note about subwoofers with balanced BTL amp posted by Rod M on May 06, 2022 at 10:55:39
Apparently it does affect other than REL subs but only when using speaker output terminals from some Class D power amps [including Wyred4Sound]. Less of an issue with a single stereo D amp, more complex connections when using a pair of Class D monoblocks.
REL documentation has several setup examples. I -think- it has to do with special grounding considerations between sub and Class D amps. If you're curious checkout the documentation for any REL T/5x T/7x or T/9x [and possibly others].
But you're not affected if you're running line level connections. The only reason I even know about this is because I was looking into REL, SVS, and Rythmik Subs
Follow Ups:
If the Class D amps don't have a ground for a sub it seems like a defect of sorts. Is it the module? Or the second speakers connection?
My preference is lineouts from the preamp to the subs, but in my office, speaker connections were the only option. Because the cables were long, I just tagged off the speakers with a short cable to the subs next to the speakers. I wonder if that would make a difference on a REL?
-Rod
I don't know exactly what the design issue is but I think it has something to do with floating ground vs chassis ground possibly due to switching power supplies.
REL shows several subwoofer connection possibilities for Class D amps in their documentation so I would have a look there if you're curious. The REL high-level speaker connection cable has three conductors so you have to pay special attention to how they are connected to the speaker terminals and ground on Class D amps.
Again, there's no issue with using line level inputs to a sub driven from your preamp. But pay special attention if using speaker level signals to your sub. It's doable but read the documentation and/or contact the sub and amp maker.
The PS Audio Class D amps have a second set of speaker connections but those are simply wired in parallel which can come in handy for bi-wiring. You can use either set if you're not bi-wiring.
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