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Multi-Way Conventional loudspeakers with crossovers

New Celestion "AxiPeriodic Driver"
New Celestion "AxiPeriodic Driver"
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Old 26th July 2016, 10:17 PM   #21
Face is offline Face  United States
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Image of the BMS coax, just for comparison sake.

Click the image to open in full size.
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Old 27th July 2016, 02:05 PM   #22
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I didn't do complete justice to the new driver yesterday when I said it merely remained pistonic over the audible. This quote from the conference paper below claims effective "pulsating sphere" behavior and goes a long way to relieving my fears that as a 2" diaphragm might beam excessively at HF.

"A radial phase-plug, designed according to the
methodology in [2], transforms the acoustical particle
motion from axial diaphragm motion to a close
approximation of a pulsating sphere at the end of the
plug. The waveguide walls are correctly shaped to allow
spherical wave propagation resulting in wider dispersion
and greater output than the original, uncovered dome."
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Old 28th July 2016, 12:57 PM   #23
Patrick Bateman is offline Patrick Bateman  United States
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This project reminds me of a prophetic essay from half a decade ago. In a nutshell, software is becoming so advanced, the difference between the winners and losers in industry is dependent on how good their software is:

Marc Andreessen on Why Software Is Eating the World - WSJ

IE, this looks like a legitimate step forward from Celestion, an achievement that would not have been possible without software.
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Old 28th July 2016, 01:17 PM   #24
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Software took over the world a long time ago. That is yesterday's story. I think Celestion's advancement should be credited to hardware finally become cheap and powerful enough that doing the amount of FEA and BEM computation that was needed became practical. Not all that many years ago, that would have taken a supercomputer.
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Old 26th August 2016, 06:21 AM   #25
ErnieM is online now ErnieM  United States
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OEM only. Guess it'll be awhile before someone could test these out.
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Old 26th August 2016, 10:50 AM   #26
phase_accurate is offline phase_accurate
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I wonder what 90x40 2" horn they used for their measurements. Celestion themselves don't have one in their programme.

Regards

Charles
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Old 2nd December 2017, 06:47 AM   #27
Ro808 is online now Ro808  Netherlands
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May be this one?

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Old 2nd December 2017, 05:37 PM   #28
BHTX is offline BHTX  United States
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Quote:
Originally Posted by Ro808 View Post
May be this one?
That appears to be an SEOS-24 from DIY Sound Group, which is not an exponential horn:
Fiberglass SEOS-24™ DIY Sound Group

Last edited by BHTX; 2nd December 2017 at 05:40 PM.
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Old 2nd December 2017, 06:17 PM   #29
eriksquires is offline eriksquires  United States
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Quote:
Originally Posted by Zero D View Post
What interests me, is celestion say it needs no Xover ! Of course it's not a piezo, so what's going on ?
Not exactly. What the spec sheet says is:

Quote:
No midrange crossover required, leading to improved performance across the crucial vocal audio band, for superb intelligibility
Meaning you don't need to pass from one driver to another in the 1-3kHz range, which is true, but you still very much need a high-pass filter, and probably some EQ work as well to get the top octave to behave.
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Old 4th December 2017, 02:21 AM   #30
Ro808 is online now Ro808  Netherlands
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Quote:
Originally Posted by BHTX View Post
That appears to be an SEOS-24 from DIY Sound Group, which is not an exponential horn:
Fiberglass SEOS-24 DIY Sound Group
That was ironic.
I am sure they've tested this driver with a wide range of horns/waveguides in the lab.
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