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Multi-Way Conventional loudspeakers with crossovers

New Celestion "AxiPeriodic Driver"
New Celestion "AxiPeriodic Driver"
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Old 21st February 2019, 05:02 PM   #331
Ro808 is offline Ro808  Netherlands
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The square rather than rectangular horn on top of the booth is actually 80 x 60 instead of 60 x 40, as I erroneously stated.
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Old 21st February 2019, 06:55 PM   #332
charlie2 is offline charlie2  England
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Im a bit wet behind the ears

But is this a one mans obsession ( marketing campaign)

For Petes sake the driver is unobtainable its a ghost driver
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Old 21st February 2019, 08:19 PM   #333
Ro808 is offline Ro808  Netherlands
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What would be the nexus between the alleged marketing campaign and unobtainability?

Last edited by Ro808; 21st February 2019 at 08:27 PM.
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Old 21st February 2019, 09:24 PM   #334
David Morison is offline David Morison  Scotland
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Quote:
Originally Posted by charlie2 View Post
Im a bit wet behind the ears

But is this a one mans obsession ( marketing campaign)

For Petes sake the driver is unobtainable its a ghost driver
It has been said several times in this thread that it is an OEM only component.
That means it'll be perfectly obtainable, if you're a commercial manufacturer who'll be ordering by the hundred (or more).
A handful at least have already made their way into the wild.
The only weird thing is that so many people outside of the target market are showing so much interest.

(That's us, by the way.)
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Old 23rd February 2019, 03:07 AM   #335
Ro808 is offline Ro808  Netherlands
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Click the image to open in full size.


Perhaps less spectacular than the Axi2050, but at least readily available, even though Celestion states "OEM Only".


"The CDX14-3040’s diaphragm surround has a periodic geometry, which effectively eliminates circumferential modes while still allowing for linear excursion. A high-temperature polymer clamp ring is optimized for stiffness through its geometry, ensuring that the dome is always held rigid and preventing the diaphragm from bending. The diaphragm assembly is located into the magnet with a precision-cut aluminium locating ring. This is probably one of the most important parts of the driver, but so often overlooked. The locating ring ensures the coil is always held concentric to the magnet gap, as any offset of the can allow it to hit the magnet assembly. Between the cover and the clamp ring is a semi-rigid layer of a polymer similar to rubber, which spreads clamping pressure more evenly across the diaphragm assembly. This means that the diaphragm assembly is more likely to stay flat, holding the dome without allowing it to deform.
Inside the die-cast aluminium cover, acoustic damping material absorbs much of the vibration to the rear of the dome and makes the sound into behave as if the cavity is slightly bigger than it is. This enables the device to work down to a lower frequency, as the air load behind the diaphragm is often a limiting factor."

..."The CDX14-3040’s diaphragm surround has a periodic geometry".
I call these things radial ribs, but I might be missing something here.

For a hard suspension Titanium diaphragm, the breakup seems well behaved.
Evidently these are manufactures plots, but they look better than those of every other Celestion 3" diaphragm driver.
It's clean to about 13kHz and the impedance peaks are unusually low/smooth.
Attached Images
File Type: png Celestion_CDX14-3040_(Frequency_response_+_Impedance) (1).png (307.9 KB, 162 views)
File Type: jpg CDX14-3040_Parts_75.jpg (310.3 KB, 165 views)
File Type: jpg CDX14-3040_Cross-Section_80.jpg (139.8 KB, 161 views)
File Type: jpg CDX14-3040_Top.jpg (196.2 KB, 159 views)
File Type: jpg CDX14-3040_Bottom.jpg (218.3 KB, 52 views)

Last edited by Ro808; 23rd February 2019 at 03:15 AM.
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Old 20th March 2019, 09:29 PM   #336
Ro808 is offline Ro808  Netherlands
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In this thread Bjrn (Omholt) shares his experiments with the K402 + Celestion Axi2050 and Radian 950PB.

Last edited by Ro808; 20th March 2019 at 09:32 PM.
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Old 20th March 2019, 11:51 PM   #337
ErnieM is offline ErnieM  United States
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Interesting. Think I'd rather take a cleaner 700hz up than a duller 300hz and up solution. This is the second occasion someone has slightly preferred another driver in place of the Axi2050.

In the meantime, B&C just announced their DCX464 coaxial compression driver.
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Old 20th March 2019, 11:54 PM   #338
300Z is offline 300Z  Brazil
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Quote:
Originally Posted by ErnieM View Post
In the meantime, B&C just announced their DCX464 coaxial compression driver.
Can't wait to see more info on that driver.
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Old 21st March 2019, 12:05 AM   #339
ErnieM is offline ErnieM  United States
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Originally Posted by 300Z View Post
Can't wait to see more info on that driver.
Yup. I'm thinking it has a 46mm voicecoil for the highs and a 64mm voicecoil for the mids. 464. We'll see.
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