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Old 22nd February 2013, 10:27 AM   #391
lolo is offline lolo  France
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Originally Posted by greenm01 View Post
Then why mount a rear firing tweeter and/or mount drivers in an open baffle?
simple! because you can toe in the speaker such as you only get the reflected wave from the back sides, much later than you would get from the sides which you can now put in the dipole null, so you increase the ITD gap! But you haven't thought of that, have you? Not talking of power response..

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Old 22nd February 2013, 10:28 AM   #392
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Then why mount a rear firing tweeter and/or mount drivers in an open baffle?
It's the only way to get a high enough reflection level
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Old 22nd February 2013, 10:36 AM   #393
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I believe a dipole can work but it requires lots of acoustic room treatment to sound really good. I'd prefer a more intelligent speaker/room design.
All speakers need that. All of them. You just treat differently..
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Old 22nd February 2013, 10:41 AM   #394
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All speakers need that. All of them. You just treat differently..
Some speakers require it more than others. In general the wider the dispersion, the more dominant the room becomes and thus the more important to get the acoustics right. High directivity speakers still benefit from good acoustics, but less so. Dipoles are kind of a different beast, because of the unusually strong front wall reflection and nulls that usually in the direction of the ipsilateral reflection point.
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Old 22nd February 2013, 10:42 AM   #395
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life can be so unfair sometimes..
Nah, that's why we have eBay
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Old 22nd February 2013, 10:43 AM   #396
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I believe a dipole can work but it requires lots of acoustic room treatment to sound really good. I'd prefer a more intelligent speaker/room design.
+2
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Old 22nd February 2013, 10:51 AM   #397
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Some speakers require it more than others. In general the wider the dispersion, the more dominant the room becomes and thus the more important to get the acoustics right. High directivity speakers still benefit from good acoustics, but less so. Dipoles are kind of a different beast, because of the unusually strong front wall reflection and nulls that usually in the direction of the ipsilateral reflection point.
mmm. But if the beam is narrow and you want to keep enough high freq in the room, you need to diffract the wall behing listener, do you? Otherwise I can't see how you can keep a decent power response.
With a dipole you just do the opposite, it's diffraction/absorption compare to absorption/diffraction.. Although some dipole fans here like to absorb the rear wave as well..
Please remark I am not even touching the very delicate subject of low freq modes and coupling..

I see it just as the two sides of the same coin..
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Old 22nd February 2013, 10:59 AM   #398
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I see it just as the two sides of the same coin..
Should that be

"I see it just as the two sides of the same cone.."
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Old 22nd February 2013, 11:01 AM   #399
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Old 22nd February 2013, 11:16 AM   #400
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mmm. But if the beam is narrow and you want to keep enough high freq in the room, you need to diffract the wall behing listener, do you? Otherwise I can't see how you can keep a decent power response.
With a dipole you just do the opposite, it's diffraction/absorption compare to absorption/diffraction.. Although some dipole fans here like to absorb the rear wave as well..
Please remark I am not even touching the very delicate subject of low freq modes and coupling..

I see it just as the two sides of the same coin..
What probably works best in a two-speaker configuration is a cardioid toed out. The idea is to create a strong side wall reflection that is spectrally similar to the direct sound. I tried a crude approximation by toeing out two Geddes Nathans and it did work quite well.
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