In my listening room of a little over 13’ x 16’ I find a single SVS SB16-Ultra to blend in very well. I’ve placed it off-center to the right between my two main speakers, and has spent some time aligning it fore/aft to make for the best timing integration, as well as adding a few, small DIY bass traps in each corner behind the main speakers to help control some bass peaks and make for a more stable and saturated stereo image. Coupled with the slight use of DSP-based PEQ and phase adjust the integration is excellent, and the respons is very flat. Coverage and smoothness through multiple (usually smaller) subs may have an advantage compared to a single sub, but I would emphasize the problem with lack of timing as a severe drawback here, insofar the subs have been spread throughout the room. There’s also the issue of single, larger radiating areas vs. multiple smaller dittos for bass, where generally I have a preference for the former. I would have loved to try out a dual sub setup with the specific sub I’m using, but unfortunately space won’t allow for this experiment with a placement between or on each outside of my main speakers.
