Beryllium diaphragms ??

[mikeharris]

I saw these folks at the AES show in SF recently...and was wondering if anyone has tried...heard...or measured these.
They fit the 375/2440 family of drivers

http://www.electrofusionproducts.com...asp?page_id=77

[ratitifb]

I saw these folks at the AES show in SF recently...and was wondering if anyone has tried...heard...or measured these.
They fit the 375/2440 family of drivers

http://www.electrofusionproducts.com...asp?page_id=77

http://www.audioheritage.org/vbullet...phragm-options


make a search with "Truextent"

[lgvenable]

these have been reviewed and discussed, just use "search"

[4313B]

I saw these folks at the AES show in SF recently...and was wondering if anyone has tried...heard...or measured these.
They fit the 375/2440 family of drivers

http://www.electrofusionproducts.com...asp?page_id=77

JBL did. The diaphragms are outstanding.

[spkrman57]

I've had them for almost a year in 2446 drivers and they have spoiled me big time!

See my avatar.

Ron

I saw these folks at the AES show in SF recently...and was wondering if anyone has tried...heard...or measured these.
They fit the 375/2440 family of drivers

http://www.electrofusionproducts.com...asp?page_id=77

[jw5115]

I was the first to use these, and had use of one pr of the prototypes prior to them being released for sale. while my first use of these was in my new line of field coil drivers. It was almost a year before I got around to refitting a stock JBL 2" format driver with these.While the performance in a field coil was to be expected to be outstanding , I had already been using JBL's GOTTO built berylium diaphrams. I was truly impressed with the improvement these made to the standard JBL line. If refitting an alnico driver I recommend recharging as well, since these are at least 30 yrs old.
when refitting these carefull attention must be made in also getting the correct height and this is usually 5-10/1000 above the top plate.
THERE IS NO LONGER ANY NEED FOR THE TAD 4001 &4002 DRIVERS WITH THERE STIFF SURROUNDS AND INABILITY TO GO DOWN LOW.
TRULY AN AMAZING SUCCESS FOR BRUSH-WELLMAN.
GOOD LUCK
JOHN WOLFF
CLASSIC AUDIO LOUDSPEAKERS

[4313B]

TRULY AN AMAZING SUCCESS FOR BRUSH-WELLMAN.

Yeah, JBL seems kind of miffed but they probably should have taken Brush-Wellman up on the offer to distribute them... Something tells me though that the price would have ended up being higher.

[cosmos]

THERE IS NO LONGER ANY NEED FOR THE TAD 4001 &4002 DRIVERS WITH THERE STIFF SURROUNDS AND INABILITY TO GO DOWN LOW.

Hi John. How low have you taken them? I've had them down to 410 Hz. with a 24db L-R slope, about as low as I'd want to take my horns, and to me they still sounded great without issues.

In answer to the OP, they are worth every penny, in my opinion. I know people who have spent much more on cables and gotten magnitudes less (if any) improvement. They are smooth and natural sounding.

[martin_wu99]

I've had them for almost a year in 2446 drivers and they have spoiled me big time!

See my avatar.

Ron

Pro sound at home!I like it,i like your signature

[kartsmart]

Has anyone tried these to replace the 2441 diaphragms for the 2397 horns with slots one the top endand how did they sound differently ?

[richluvsound]

its like taking the cotton wool out of your ears ! I believe others will agree me - you find the missing 15% of music you paid for

Rich

[1audiohack]

Has anyone tried these to replace the 2441 diaphragms for the 2397 horns with slots one the top endand how did they sound differently ?

Funny you should ask! This exact task is on my this week to do list.

[kartsmart]

Funny you should ask! This exact task is on my this week to do list.

Keep us posted on the 2397s and how they sound with the slots , also what are you using below the horns ? crossovers ?

[richluvsound]

Hey Hack ,


exciting stuff dude . I look forward to your impressions ...... Not wishing to piss on your fire ,but you may find the horn holds you back a bit . You may find you need a horn with more loading to make the most of the extension you will get below 900 hrtz ... Just my opinion .

The slots may be redundant too. You should be able to get the 2441 flat past you hearing . Maybe a Ribbon or the TD 703 ?


Rich

[1audiohack]

I have never myself used the 2397 although I have heard them alot. The pair I have were recently aquired for measurement purposes mostly and one more reference.

Since there is much published data for the 2441/2311 and 2441/2397 combinations and these were designed to work together I want to get familiar with them. I have not heard a 2" throat horn yet that I didn't think would benefit from a real tweeter (but I haven't heard them all) and I don't expect these to be any different. I am just trying to make my measurement and mental references more complete. What I am really interested in is what makes good workable combinations with the least amount of required EQ, one of the worst so far with the parts I have is a 2441Al on a 2365, yuck.

I plan on running them with AL,Ti, and Be. To listen to these I will probably set them on top of my office system so the stack would be Sub1500's, 2020's, 2397's, with 077's in and out optional. A DBX260 does the dividing, fun!