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RE: Note about subwoofers with balanced BTL amp

Posted by AbeCollins on May 7, 2022 at 07:42:30:

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.