New to this forum. Hello All. I would add this: ybe happy if you can hear the difference cause tweaking the placement or the phase makes audible differences. No argument against science except this is empirical. There are those that can’t hear the difference and those that can. End of story.
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
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
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I have a question for people who have phase controls for their subs. How do these work?see ieLogical SubterraneanHomesickBlues Most Phase controls are All Pass filters. They don't affect all frequencies equally. see http://www.ielogical.com/assets/SubTerrBlues/PhaseControl.png To properly integrate a 'generic' sub controls for Level, Phase, Polarity, Crossover Hz & Order are required. Delay is icing on the cake. Bespoke subs mating to a specific set of mains may get by with fewer controls. MC's response is nonsense. But I repeat myself. |
Miller Carbon and all of you that are "amazed by his knowledge" need to come to my house. My Velodyne subs, like the OP’s, also have four selectable amounts of phase delay. If you can’t hear the differences in 0, 90, 180 and 270 degrees with your ears and see them on an spl meter, then you are deaf and blind. This is a system with two subs rolling off above 40Hz and the loudspeaker pair running full-range. |
While it would seem that getting the phase to match the mains is ideal, theoretically this isn't necessarily going to result in no peak or notch at the crossover point. Not unless the slope of the cutoffs for both are the same. For a mains woofer, in a cabinet, this isn't actively controlled and is prob more gradual than a sub. Perhaps this is why best sound and SPL may be something other than zero. It mitigates that complex interaction, peak or notch. One of the advantages to wiring speakers to a (some) sub's speaker output and using its high-pass. Also, distance from sub to listener vs mains to listener further makes this issue more complex. Adjustable phase is an aid for both issues. Good stuff on this (in discussions of tweeter to woofer xo designing) at Linkwitz Lab site. |
- 83 posts total