Albert Von Schweikert has used the wave-cancelling technique for years, and we still do it today using our Foundation analog control suite (no DSP required). Generally, we place two subs at the rear of the room, and we have not found a room yet where we could not mitigate bass room modes to a significant effect. Would four be better? Perhaps with an especially noxious room.
We also like to combine room mode cancellation with additional bass reinforcement. This can be done in a front/rear arrangement (four woofers or simply upfront, as we do with our Ultra 11 speakers, using one sub for reinforcement and the other for wave cancellation. In our experience, it's almost always best to face the wave-cancelling woofer firing toward the wall.
JR is a fantastic resource, as is Duke, who first introduced his swarm approach quite some time ago. I might add that Duke's system is quite a good value. Duke, good to see you still supporting the mighty SoundLabs
www.audiokinesis.com
Von Schweikert's new 10" sealed Foundation subwoofer, and a higher power vented 12" subwoofer below.

We also like to combine room mode cancellation with additional bass reinforcement. This can be done in a front/rear arrangement (four woofers or simply upfront, as we do with our Ultra 11 speakers, using one sub for reinforcement and the other for wave cancellation. In our experience, it's almost always best to face the wave-cancelling woofer firing toward the wall.
JR is a fantastic resource, as is Duke, who first introduced his swarm approach quite some time ago. I might add that Duke's system is quite a good value. Duke, good to see you still supporting the mighty SoundLabs
The Swarm Subwoofer System
Von Schweikert's new 10" sealed Foundation subwoofer, and a higher power vented 12" subwoofer below.

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