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Critical subwoofer tip

I assume that everyone already knows the importance of phase matching a sub to the main speakers but it’s a little more complicated than simple 90 degrees or 180. The B&W sub that I have has four choices. In every case there has been a definite correct position that can be non standard. My current setup shined at 270 degrees vs the std positions. It’s completely obvious and the other choices would not have been satisfying. 
From my lengthy experience I would want a subwoofer with several phase choices. I personally don’t see how one could seamlessly integrate the mains and the sub without this flexibility. No one asked but i thought this info might be useful to anyone purchasing a subwoofer. YMMV
4425

Showing 1 response by mike_in_nc

mike_in_nc
1,166 posts
 
The idea that reflections negate the need for sub phase matching is erroneous. However, it may be less important for those using DBAs, which (at least from what I’ve read) often run the subs somewhat out of phase with one another.

I have done measurements, and despite reflections, having a sub out of phase with the corresponding main speaker can give a broad and deep (and quite audible) null near the crossover frequency. This isn’t theory or possibility, it’s reality. It’s why expensive subs tend to have continuous phase (delay) controls on them.


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