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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: Excellent point posted by Duke on October 27, 2016 at 11:13:05:
I checked out your website. I assume you're talking about this:
http://www.audiokinesis.com/dream-maker-lcs.html
Looks like a controlled dispersion main speaker with some rear radiators, combined with a second effects speaker on the floor against the wall. Although the effects speaker is on its back so the peak of its radiation pattern is pointing at the ceiling, it is also going to radiate like an omni in the horizontal plane and produce a strong reflection off the front wall that will arrive just a few ms behind the main speaker, even earlier than the front wall reflection from a typical speaker.
In the picture from RMAF below, the effects speakers are in the corners. That position should produce a strong early reflection out of the corners, like that from a dipole or bipole but arriving in half the time.
I get that there will be a later reflection from the ceiling, but it looks like you're also adding early reflections and I can't square that with what you're saying about reflections being outright undesirable before 6 milliseconds.
It would seem to me that you could reduce the amount of radiation from the effects speaker onto the wall and delay the arrival of the front wall reflection just by moving the effects speaker out from the wall so it's directly behind the main speakers. Perhaps you've tried that and it didn't sound as good, but it would seem to better match the theory.
Another idea would be to place an upward firing 2-3" wideband driver on the top of each speaker in a shallow waveguide, perhaps recessed a bit with a ring of absorber around it just to make sure it doesn't contribute anything to the direct sound.
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Follow Ups
- It looks like your design will add reflections earlier than 10ms too - Dave_K 05:37:46 10/29/16 (1)
- A little bit, but the later reflections are many times stronger - Duke 11:31:40 10/29/16 (0)
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