Coral M-4501 compression driver mystery

Hi,
just arrived from Japan mounted on coral ah-502 horn but I cannot find any Informations about these drivers. Any ideas about them?
Thanks!
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Here are some photos of a horn/lens made by Fukuyo/ Coral Professional Audio, almost a direct copy of JBL's 2307/2308:
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JBL23xx .png

The Coral M-100 specifications and appearance are very similar to the JBL 2410.
The M-4501 may be more similar to the JBL 2461, which used a phenolic diaphragm, response 500-12kHz.

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The Coral AH-502 horn appears to have copied the JBL 2345:
Screen Shot 2024-03-25 at 3.57.58 PM.png

Your M-4501 photo shows the back cover missing screws, does it have a working diaphragm?

Art
 
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Hey I got a pair of these anyone knows of any replacement diaphragms for them or for a pair of electrovoice dh1a both are heavy the first are 10 lbs a piece the other 25 lbs so I need newer diaphragms for them wondering if they made textreme or beryllium for them contacted radian but they never answered they both got working diaphragms but I want extra so any info will help
 
Radian seems to only make beryllium diaphragms for their own drivers.
JBL and Altec ~1.75" diaphragms physical mountings are different from each other.
As far as the similar size Coral, DuKane, and TOA diaphragms, I don't know if they are the same mounting configuration as either JBL or Altec.

To my knowledge Radian has never made any aftermarket diaphragms of any material to fit EV drivers.
Personally, I don't think there would be much to gain substituting beryllium or Textreme for the stock 3" titanium DH1A diaphragm (other than above ~15kHz) and may be a loss in the low end.

Art
 
Thanks I read that the dukane 5a540 is a clone of the jbl2410 I guess I can try some radian diaphragms since I know radian has them for jbl I was hoping but I want to see it possible but Thanks again wanted to hear if it was possible to step up my two monsters i guess I'll just buy extra compression driver like eminence for the textreme and radian for the beryllium