AxiPeriodic Drivers - Axi2050 - Celestion - Guitar, Bass & Pro Audio Speakers
? 🙂
Frequency range300-20,000Hz
Voice coil diameter125mm/5in
Diaphragm type Circumferentially, AxiPeriodic, single annular
titanium diaphragm, integrated surround
http://www.tubeampdoctor.com/pdf/Celestion/Celestion_Pro_Speaker_Catalogue16.pdf - p. 6-7
https://www.facebook.com/Celestion/posts/1154178807937601 "Celestion Speakers: We expect it to be available for manufacturers towards the end of the year,"
? 🙂
Frequency range300-20,000Hz
Voice coil diameter125mm/5in
Diaphragm type Circumferentially, AxiPeriodic, single annular
titanium diaphragm, integrated surround
http://www.tubeampdoctor.com/pdf/Celestion/Celestion_Pro_Speaker_Catalogue16.pdf - p. 6-7
https://www.facebook.com/Celestion/posts/1154178807937601 "Celestion Speakers: We expect it to be available for manufacturers towards the end of the year,"
Last edited:
Any idea what it is? What size exit? Never heard of that term before.
Looks like its high end really drops away at about 12kHz but still impressive
Looks like its high end really drops away at about 12kHz but still impressive
The 140 dB figure is measured at one watt on a plane wave tube. Mounted on an exponential horn, it would appear that around 105 dB SPL (for one watt input ?) is the appropriate measurement for comparision with other drivers.
AES New York 2015
Paper Session P6
Friday, October 30, 9:00 am — 12:30 pm (Room 1A08)
Paper Session: P6 - Transducers—Part 2: Loudspeakers
Chair:
Sean Olive, Harman International - Northridge, CA, USA
P6-6 Wideband Compression Driver Design. Part 2, Application to a High Power Compression Driver with a Novel Diaphragm Geometry—Mark Dodd, Celestion - Ipswich, Suffolk, UK
Performance limitations of high-power wide-bandwidth conventional and co-entrant compression drivers are briefly reviewed. An idealized co-entrant compression driver is modeled and acoustic performance limitations discussed. The beneficial effect of axisymmetry is illustrated using results from numerical models. Vibrational behavior of spherical-cap, conical, and bi-conical diaphragms are compared. Axiperiodic membrane geometries consisting of circular arrays of features are discussed. This discussion leads to the conclusion that, for a given feature size, annular axiperiodic diaphragms have vibrational properties mostly dependent on the width of the annulus rather than it's diameter. Numerically modeled and measured acoustic performance of a high-power wide-bandwidth compression driver using an annular axiperiodic membrane, with vibrational and acoustic modes optimized, is discussed.
Paper Session P6
Friday, October 30, 9:00 am — 12:30 pm (Room 1A08)
Paper Session: P6 - Transducers—Part 2: Loudspeakers
Chair:
Sean Olive, Harman International - Northridge, CA, USA
P6-6 Wideband Compression Driver Design. Part 2, Application to a High Power Compression Driver with a Novel Diaphragm Geometry—Mark Dodd, Celestion - Ipswich, Suffolk, UK
Performance limitations of high-power wide-bandwidth conventional and co-entrant compression drivers are briefly reviewed. An idealized co-entrant compression driver is modeled and acoustic performance limitations discussed. The beneficial effect of axisymmetry is illustrated using results from numerical models. Vibrational behavior of spherical-cap, conical, and bi-conical diaphragms are compared. Axiperiodic membrane geometries consisting of circular arrays of features are discussed. This discussion leads to the conclusion that, for a given feature size, annular axiperiodic diaphragms have vibrational properties mostly dependent on the width of the annulus rather than it's diameter. Numerically modeled and measured acoustic performance of a high-power wide-bandwidth compression driver using an annular axiperiodic membrane, with vibrational and acoustic modes optimized, is discussed.
What interests me, is celestion say it needs no Xover ! Of course it's not a piezo, so what's going on ?
thanks NC535, Flaesh,
That probably means no crossover is needed between the sections within that driver (a guess). The power handling small print mentions band limited noise, which I think means it still needs an overall highpass crossover to the driver in general.
That probably means no crossover is needed between the sections within that driver (a guess). The power handling small print mentions band limited noise, which I think means it still needs an overall highpass crossover to the driver in general.
That dude says he's from Kef in this video:
https://www.youtube.com/watch?v=F3wMIgoV2Y4
Kef is the corporate sibling of Celestion. So I'm guessing that this compression driver is either a new take on wide bandwidth transducers (possibly BMR-ish?) or else it's an application of some of the innovations from the KEF LS50 into Celestion's lineup.
If you do a search for "mark dodd coincident source array" you'll turn up some of his work on the LS50
I hate to be a cynic, but it mostly appears that Celestion noticed that BMS made some clever coaxial compression drivers, and due to the fact they're made in Germany, they're $1500 a pair.
I *love* Celestion, I use it in literally half my projects, but a large part of the reason they're so darned good is that they're ubiquitous. The reason that I can get a great Celestion compression driver for $50 is because that same compression driver is in powered loudspeakers that you can find on Amazon for $250. Basically economies of scale that smaller manufacturers like 18Sound and Faital don't have.
JBL could probably sell their compression drivers at similar price points, they're made in Mexico.
Jbl's D2 dual diaphragm looks like another way to skin the cat. Anyway those are compomising at both ends of passband.
the diaphragm(s) and phase plug appear to be very proprietary.
i love the 1'" drivers from celestion and agree they sell them at really fair pricing. Never like the bms drivers in my system.
i love the 1'" drivers from celestion and agree they sell them at really fair pricing. Never like the bms drivers in my system.
So basically it's a large diameter ring radiator with carefully optimized breakup modes to extend top octave response. Will be interesting to hear how it does compared to current alternatives.
Go figure, it looks like this *isn't* a clone of the BMS.
I read the press release, and took a cursory look at the driver, and assumed that it was *two* rings.
But it's not - there's one ring and one voice coil. So this *is* something new. Neat.
I marked up their pic, to show what I mean. There are two acoustic pathways but only one voice coil and one diaphragm.
In some ways this is the *opposite* of the JBL. The JBL has two diaphragms, two phase plugs, and one acoustic pathway. The reason that the JBL works is because everything is equidistant. This is key, as a pathlength difference of even half an inch would create comb filtering in the top octave.
If the Celestion only has one diaphragm, but has two pathways, than that would seem to indicate that they've designed the diaphragm so that the highs are coming off one portion of the diaphragm, while the lows are coming off the other. Perhaps by using BEM they were able to optimize the diaphragm to do this. (Similar to how small full range drivers work, but it's not a cone it's a ring.)
I read the press release, and took a cursory look at the driver, and assumed that it was *two* rings.
But it's not - there's one ring and one voice coil. So this *is* something new. Neat.
I marked up their pic, to show what I mean. There are two acoustic pathways but only one voice coil and one diaphragm.
In some ways this is the *opposite* of the JBL. The JBL has two diaphragms, two phase plugs, and one acoustic pathway. The reason that the JBL works is because everything is equidistant. This is key, as a pathlength difference of even half an inch would create comb filtering in the top octave.
If the Celestion only has one diaphragm, but has two pathways, than that would seem to indicate that they've designed the diaphragm so that the highs are coming off one portion of the diaphragm, while the lows are coming off the other. Perhaps by using BEM they were able to optimize the diaphragm to do this. (Similar to how small full range drivers work, but it's not a cone it's a ring.)