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In Reply to: RE: Stereo Sub-Woofers posted by Bold Eagle on December 29, 2016 at 09:41:28
Same here! Stereo subs.
Just last week tried using stereo subwoofers. Now I would argue the point that you only need one for stereo use.
You go Jerry!!!!
Follow Ups:
Jerry were you there the time a guy brought a giant sub to the DYI speaker show in Dayton Ohio?...it was in one corner of a big room.He switched it on and it started to play. The funny thing I think is that there was not a hint of directionality to the sound coming out of the giant sub. I shut my eyes and without a visual cue there was no way i could determine where in the room the bass was coming from.And it was purposely way off center.
If you feel a sub is directional, then either the sub is playing frequencies that are high enough to be directional(not uncommon with consumer grade 3-piece systems) OR your eyes are fooling you and you think you are hearing the sub frequencies coming from one side or another of the room because of the visual cue for the sub location.
David
David et al.,
I believe there's more to the single sub than just directionality. I also think there's an issue with quality from a couple of factors.
First, there's the issue of exciting room modes. Two subs give a different pattern of room modes, and the excitation ought to be smoother.
Second, in a two woofer set up, switching the bass from mono to stereo sounds different. It could be from room modes, or interaction with the main speakers; or the summing when done electrically is not the same as when done acoustically in the room. For one thing, a single sub will not have the effect of Mutual Coupling. For another, if the original bass source is not centered, it will emerge from the two woofers with some phase shift between them. That phase difference gets wiped out in a summed signal.
My best success in a single sub, was a 12" woofer from Speaker Lab in a 3.25 cu. ft. ported enclosure with a third order low pass filter. But it only worked properly when wall loaded and accurately centered. Turned to the wall, the sound is more diffuse from the woofer, including port noise and woofer harmonics.
Another factor, usually overlooked is the production of harmonics by the woofer. While a 4th order low pass will certainly attenuate the fundamentals above its pass band, the harmonics are generated by the woofer itself and are not attenuated. Similarly, port noise is not attenuated. That argues for significantly higher quality woofers in a mono sub than would be needed in a pair of subs, stereo or not. In my case, I chose an Acoustic Suspension design to eliminate port noise.
Jerry
If I recall correctly, Linkwitz recommends multiple open-baffle subwoofers placed around the room to best deal with room modes. I don't have room for additional subwoofers, so my solution is to let my satellites (Spendor BC-1's) run full range and roll the subwoofer in around 40Hz. My room is paneled, with a carpeted concrete floor and one wall of cinderblocks. There is a lot of base boost so the subwoofer is set very low. It work pretty well. There is more than one way to skin a cat.
Dave
The two powered Eosone 12" subs used in the HT have a 12 db / octave low pass crossover switchable from 50 to 120 hz. Even set to 50 hz, I can faintly make out vocal fundamentals.I've yet to hear a single sub not call attention to itself.
Edit: Meant to place above this post, but am traveling and editing with phone is difficult. You get it, but I'm not sure that David does.
Edits: 12/31/16
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