What is your experience with the W26FX002. I am considering using this in a single solution, please see my discussion;
https://www.diyaudio.com/community/threads/2-possibly-3-ways-around-the-fostex-fd600.403095/
For those who may interested, early next year I may be looking to sell a brand NEW 16 ohm pair of these via PayPal
https://www.usspeaker.com/radian 745neoBepb-1.htm Haven't decided on pricing but splitting the PayPal fees will help expedite the sale.
https://www.usspeaker.com/radian 745neoBepb-1.htm Haven't decided on pricing but splitting the PayPal fees will help expedite the sale.
Funny you should ask. At 8:33 in this video Troy (Joseph) Crowe mentions his collaboration with a local plastics maker that produced a clone of a diaphragm for this or another a JBL driver.
Why not let him know of the substantial demand among those at this thread and beyond for perfect clones to repair and to have on hand as "spares" to maintain usage of this much praised driver?
Presumably, any difficulty in doing so lies with successfully replicating those "fingers" surrounding the diaphragm. As those here have certainly speculated on the purpose of those structures, if Troy and the rest of us could determine their true purpose perhaps that would better ensure that new diaphragms for the 6681B would deliver sound quality identical to the originals. joseph_crowe@josephcrowe.com
My bad, I should have read the rest of this thread since your last post. Wow! Radian and you guys are truly committed to making this happen! It will be quite the event when seasoned ears do comparative tests between drivers with the original diaphragms in excellent condition and the final prototypes. Then if they sound essentially identically they will likely test as much.
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I wouldn't know if this would help but at some point during the design/test phase of the finger design, this OEM might offer advanced methodologies to perfect that step.
https://www.kartesian-acoustic.com/copie-de-motor-structure
https://www.kartesian-acoustic.com/exclusive-spk-request
https://www.kartesian-acoustic.com/exclusive-transducers
No idea on exactly how they might help or their fees but further inquiries could be worth while.
But if n/g and/or especially if you're a lot closer to perfectly cloning the finger structure, reaching out to https://josephcrowe.com/ might be the best bet. Troy fully tests new drivers and horns very often, posts his results on YouTube AND I think he may know a local precision OEM who might turn out very small runs.
Also, there's those other OEMs I had posted here earlier.
Just checking if you have seen the finger(s) drawings shown in Figs 3 and 4 of the Yamaha patent, post #526.
Won't these close up photos help? https://josephcrowe.com/blogs/news/yamaha-ja6681b-compression-driver
https://www.madagascarsound.com.au/2018/yamaha-ja-6681b/
And if this damaged one is still available.
https://www.befr.ebay.be/itm/JA6681B-Yamaha-Diaphragm-NB093100-in-original-box-n eeds-to-be-redomed-/222009046870
Are you saying with a good tweeter (like the one you recommended in posts #1 and 4 and which Lagroute warned against in post #29), that the 6681B in the Athos 4001 horn won't match the sound stage size, openness and transparency of a Seos horn? If so, why is this?
And which horn Seos model?
Does it matter whether the Seos/Yamaha combo is placed on the room's long or short wall? Best seating distance?
How to integrate two or three of the best MODEL tweeter drivers, as recommended by you and Lagroute?
Crossover point with a 3 cu ft sealed Altec 416-8B midwoofer?
Please also spare some time to peruse these horns and plans and compare them to Seos horns for use with the 6681B. https://josephcrowe.com/
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Hi Oltos,
I don't know how Yamaha sqeezed 14khz out of the JA6681. It falls off like a rock beyond 12khz in real life application.
I tried to integrate one of the best ring radiators out there but the result was never satisfying. Can't speak for the Raals or other exotic tweeters though as I am on a budget.
Time moves on and if I had the same big listening room and a functioning pair of 6681 as back then I would experiment further with different components but I need to work with what I have.
Joseph Crow designs are outstanding as far as I can see but pulling them off in diy is no small task.
The Seos approach is the best compromise I came across so far.
Things might change if you sit 20 feet away from the speakers but very few people have this privilege.
Cheers Klaus
P.s. a transparent DSP crossover/EQ can change things drastically for the better.
I don't know how Yamaha sqeezed 14khz out of the JA6681. It falls off like a rock beyond 12khz in real life application.
I tried to integrate one of the best ring radiators out there but the result was never satisfying. Can't speak for the Raals or other exotic tweeters though as I am on a budget.
Time moves on and if I had the same big listening room and a functioning pair of 6681 as back then I would experiment further with different components but I need to work with what I have.
Joseph Crow designs are outstanding as far as I can see but pulling them off in diy is no small task.
The Seos approach is the best compromise I came across so far.
Things might change if you sit 20 feet away from the speakers but very few people have this privilege.
Cheers Klaus
P.s. a transparent DSP crossover/EQ can change things drastically for the better.
I didn't open any door 
.
While it is unfortunate that 66.6mm voice coil aluminum diaphragms for the Yamaha JA-6681 using the 15 tiny copper beryllium arms for suspension are not available, there was nothing in the original design that I thought was particularly compelling.
In case anybody is starting the thread from scratch, one correction should be noted: In post #10 Radian wrote:
"If you got the 6115H or the 6215H Monitor then there is the JA-6681b in it. If you got
the 4115H then there is the JA-6603 in it."
The Yamaha S4115H and the floor monitor (S2115H?) used the JA4201 Horn/Driver, a much smaller 42mm (1.6") diaphragm, crossed at 2000Hz.
Art
.While it is unfortunate that 66.6mm voice coil aluminum diaphragms for the Yamaha JA-6681 using the 15 tiny copper beryllium arms for suspension are not available, there was nothing in the original design that I thought was particularly compelling.
In case anybody is starting the thread from scratch, one correction should be noted: In post #10 Radian wrote:
"If you got the 6115H or the 6215H Monitor then there is the JA-6681b in it. If you got
the 4115H then there is the JA-6603 in it."
The Yamaha S4115H and the floor monitor (S2115H?) used the JA4201 Horn/Driver, a much smaller 42mm (1.6") diaphragm, crossed at 2000Hz.
Art