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Old 27th February 2013, 08:53 AM   #811
lolo is offline lolo  France
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Glory to the CBT! Eh.. when will they make a dipole version of it?

BTW, you did not answer, what is the polar like below 6-500hz?
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Old 27th February 2013, 08:55 AM   #812
lolo is offline lolo  France
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Quote:
Originally Posted by Omholt View Post
With all due respect, many of you do not seem to understand the importance of a uniform response over a broad passband, and think that a speaker this is beaming is without flaws. You are overly concern with some sidewall reflections while you overlook the coloration it brings. A speaker that is beaming and has a polar that is collapsing is in totally need of broadband treatment to sound correct. Both at sidewalls and at the ceiling!
You think you are only the one to understand that? What is a point source CD dipole after all?
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Old 27th February 2013, 09:20 AM   #813
lolo is offline lolo  France
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Quote:
Originally Posted by Omholt View Post
I can't agree with you. First of all the CBTs are not omnis horizontally.
Secondly, they are have an off-axis response horizontally that resembles the direct sound to a greater degree then a normal size waveguide/horn. How can you then say that lateral contribution from a CBT is worse then from a waveguide? It's the opposite. A speaker that is omni at some frequencies and narrow at others, will colour the sound far more.
the (genuine) question is, what would the WG proponents do IF it was possible to design a compact (read: one you can sell..) WG going as low as 100hz.. Woud they still keep the omni pattern and argue (without too much evidence actually) that below 1khz it's not that important?

If I had to give up on dipoles and go "narrow", I would on paper choose the Synergy, but hey, I know nothing..
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Old 27th February 2013, 09:55 AM   #814
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How can the CBT not omni at lower frequencies? Is there any plots to back this?

Small unidirectional can be built using opposing woofer with digital delay I think (cardioid).
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Old 27th February 2013, 09:56 AM   #815
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I think it makes sense to couple a waveguide to a cardioid.
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Old 27th February 2013, 10:07 AM   #816
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I have wanted to do that but not really keen on the 5 amps/xo requirements
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Old 27th February 2013, 11:16 AM   #817
lolo is offline lolo  France
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Quote:
Originally Posted by keyser View Post
I think it makes sense to couple a waveguide to a cardioid.
it does, why is it not done is the question! however, wouldn't the cardioid still be too wide?
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Old 27th February 2013, 02:01 PM   #818
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Originally Posted by lolo View Post
You think you are only the one to understand that? What is a point source CD dipole after all?
...Apparently he is one of the few!

As some still persist in positing benefits to a dipole in a bounded environment!
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Old 27th February 2013, 02:13 PM   #819
dewardh is offline dewardh  United States
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Quote:
Originally Posted by ScottG View Post
The lower interest in the IMP might not be that weird.. I don't think many people have ever even heard of the AES paper(s).
But most have heard of (and heard) Bose . . . which does pretty much the same thing for pretty much the same reasons.

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Originally Posted by a_tewinkel View Post
Well someone pointed out that the results of the test weren't statistically significant anyway. Then someone mentioned CBTs, Earl Geddes joined in and things went along from Orion-bashing to the usual "what is the best radiation pattern" question
No surprise that . . . it’s not at all hard these days to design and build speakers that are reasonably flat on-axis (we have good “tone controls” now, too) and with inaudible (masked) distortion (cf Geddes). That speakers still “sound different” in the listening room leaves . . . the room itself, and the power response/polar pattern of the speaker exciting the room. So that’s what we end up talking about. And it generally divides us into two camps: the “exclude the room” (narrow polar) group (who tend to listen to “studio” and HT types of “synthetic” sound); and the “include the room” (omni and dipole) group (who tend to listen to “acoustic” (typically “classical”) music and want “high fidelity” reproduction of that “original sound”).

Quote:
Originally Posted by Omholt View Post
The CBT benefits from a near uniform 180 degree power response
That’s not what I heard, nor do I see how it could be the case regarding horizontal dispersion.

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Originally Posted by foxfyr View Post
some still persist in positing benefits to a dipole in a bounded environment!
Perhaps because some of us have heard them?
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Old 27th February 2013, 02:20 PM   #820
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Quote:
Originally Posted by lolo View Post
it does, why is it not done is the question! however, wouldn't the cardioid still be too wide?
If you find a cardioid is still too wide you could tune its polar response to a super/hypercardioid.
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