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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: Duke...opinions please! posted by David Yost on March 6, 2007 at 09:00:14:
Hi David,Well you asked me to give my opinion on the downside of using a Cheney-esque slotted waveguide. In playing devil's advocate here, hopefully I won't totally rain on your parade - in the end I think it's worth a shot. Okay, here are the downsides I see:
1. As you widen the radiation pattern with the diffraction slot, you'll be spreading the energy thinner so to speak. And most of that panel area's output probably won't even make it through the slot. So the SPL in the sweet spot from that section of the panel will probably go down. Whether or not this will produce wierd effects, I don't know.
2. A diffraction slot may introduce coloration, but that coloration probably won't be audible at low or medium output levels. I definitely think the diffraction slot was an improvement on the VMPS speakers, so this probably isn't a big concern.
3. I don't know the best way to deal with that portion of the output that's occluded by the plywood - whether to absorb it, or try to channel it out the sides, or what. I think Brian Cheney had plenty of extra efficiency in the planar driver he uses his diffraction slot waveguide on, so he could get away with lots of absorption.
4. Line source propagation holds up for something like four line lengths' distance. So if your slot is two feet tall, it should give you line source propagation out to about 8 feet. [In a case where the line source extends from floor to ceiling, the effecive line length is tripled because of the reflections off the floor and ceiling - thus also tripling the distance to which line source propagation holds up.]
5. The upper and lower unoccluded sections may act as two separate radiators, which can result in some vertical comb filter effects.
Now after all this negativity on my part, let me say that often acoustics and ears do not work the way the brain reasons out they should. So I'd say go ahead and give it a shot! The cost of failure is small in this case, and the possible benefits are large.
If you do forge ahead and try it, let us know how it works!
Duke
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Follow Ups
- Re: Duke...opinions please! - Duke 14:57:51 03/06/07 (1)
- Re: Duke...opinions please! - David Yost 06:26:26 03/07/07 (0)
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