Celestion's senior acoustic engineer posts here all the time, so they're definitely "in touch" with the DIY community:
https://www.diyaudio.com/forums/search.php?searchid=19800007
I am looking forward to the first Danley/PureGroove products with the Axi2050.
This driver could potentially improve fidelity and have a beneficial impact on production costs as well as retail prices.
The mids and the accompanying complex XO are the weak spot in the Synergy concept. That's my humble opinion after listening to 10-12 different Danley/PureGroove systems and I know I am not alone in this.
It wouldn't surprise me, if Tom is currently testing some of these in his lab.
This driver could potentially improve fidelity and have a beneficial impact on production costs as well as retail prices.
The mids and the accompanying complex XO are the weak spot in the Synergy concept. That's my humble opinion after listening to 10-12 different Danley/PureGroove systems and I know I am not alone in this.
It wouldn't surprise me, if Tom is currently testing some of these in his lab.
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Pure Groove Systems threw in the towel. It became a venue for playing soccer.
You can see Danley's speakers sitting sadly in the background
Evolve Soccer LA - 52 Photos - Soccer - 1921 Blake Ave, Los Angeles, CA - Phone Number - Last Updated November 25, 2018 - Yelp
I used to rave a lot in the nineties, and this particular part of Los Angeles was where a ton of the 'underground' parties were. I'm guessing Pure Groove Systems were hoping to "re-ignite" some of that retro vibe, but that ship sailed a long time ago. EDM isn't an underground thing anymore, you don't need to go to shows on skid row anymore. 25 years ago, that was the norm; almost every rave was in this neck of the woods. But it all got big and commercial and it moved out of this neighborhood.
You can see Danley's speakers sitting sadly in the background
Evolve Soccer LA - 52 Photos - Soccer - 1921 Blake Ave, Los Angeles, CA - Phone Number - Last Updated November 25, 2018 - Yelp
I used to rave a lot in the nineties, and this particular part of Los Angeles was where a ton of the 'underground' parties were. I'm guessing Pure Groove Systems were hoping to "re-ignite" some of that retro vibe, but that ship sailed a long time ago. EDM isn't an underground thing anymore, you don't need to go to shows on skid row anymore. 25 years ago, that was the norm; almost every rave was in this neck of the woods. But it all got big and commercial and it moved out of this neighborhood.
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They pulled the plug?
PureGroove is marketed by Danley Soundlabs and their own website is still in the air.
However, the most recent updates are related to their studio monitor line-up.
PureGroove is marketed by Danley Soundlabs and their own website is still in the air.
However, the most recent updates are related to their studio monitor line-up.
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polars on Axi2050
I have no doubt that this excellent design can do a 300-20K but how is the high frequency performance off axis? Does it drop off like a stone?
I have no doubt that this excellent design can do a 300-20K but how is the high frequency performance off axis? Does it drop off like a stone?
Isn't that the whole point of the design: it tries to nullify the higher frequency modes of the diaphragm.
Off axis response is mostly dependent on the design of the horn and above 8kHz pretty much defined by the phase plug. In the case of the Axi driver this is the inner channel.
So far, without detailed and specific data, we have to guess about the Axi2050's performance.
The big annular diaphragm is very rigid due to its centered voice-coil, dual clamps on both the in- and outside edge, as well as the features (ribs) in the diaphragm. Therefore it's supposed to operate in pistonic motion over a much wider range, even compared to drivers with a 3" diaphragm. Its 5.25" diaphragm is designed to "flex" at both sides of the voice-coil.
So far, without detailed and specific data, we have to guess about the Axi2050's performance.
The big annular diaphragm is very rigid due to its centered voice-coil, dual clamps on both the in- and outside edge, as well as the features (ribs) in the diaphragm. Therefore it's supposed to operate in pistonic motion over a much wider range, even compared to drivers with a 3" diaphragm. Its 5.25" diaphragm is designed to "flex" at both sides of the voice-coil.
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In 1978, Sony engineers had similar objectives with their honeycomb diaphragms:
"For accurate pistonic motion of loudspeaker diaphragm which of course guarantees high fidelity sound reproduction, this new loudspeakers were developed. This loudspeaker, having honeycomb sandwich diaphragm which is derived at multiple points to eliminate low-order break-up vibrations, has only 1/20 diaphragm deformation and also four times wider pistonic motion range, compared with current one".
"For accurate pistonic motion of loudspeaker diaphragm which of course guarantees high fidelity sound reproduction, this new loudspeakers were developed. This loudspeaker, having honeycomb sandwich diaphragm which is derived at multiple points to eliminate low-order break-up vibrations, has only 1/20 diaphragm deformation and also four times wider pistonic motion range, compared with current one".
Parts I & II of the project (courtesy of Bernie Broderick):
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Lots of good info! The low frequency performance is impressive..looks like it'll make smaller synergy horns obsolete by eliminating the need for close spacing at the throat.
I think 300hz is probably safe when combined with direct radiators but it might be wise to raise the crossover a bit if combined with a high power mid-bass horn section. They mention that the area is approximately the same as a 5.5" dome. It has 1mm of linear travel. It can only move so much air. For a very loud and clean horn-loaded point source PA system I would use it above 450hz.
I think 300hz is probably safe when combined with direct radiators but it might be wise to raise the crossover a bit if combined with a high power mid-bass horn section. They mention that the area is approximately the same as a 5.5" dome. It has 1mm of linear travel. It can only move so much air. For a very loud and clean horn-loaded point source PA system I would use it above 450hz.