High Efficiency Speaker Asylum

RE: Yep, one at a time...

204.94.81.82

Rod M

W

In Reply to: RE: Yep, one at a time... posted by Ivan303 on November 13, 2023 at 19:52:05

You're making me wonder what I have and should I have them re-magnetized. As I recall, Bruce bought a lot of JBL 2440s and changed out the diaphragms for 2441s. Did you get your JBLs via Bruce?

What does Radian say about diaphragms? I noticed that a lot of the aftermarket folks are selling titanium diaphragms instead of aluminum.

-Rod

https://www.simplyspeakers.com/jbl-replacement-speaker-diaph (Open in New Window)

Follow Ups:

RE: "Did you get your JBLs via Bruce?" - Ivan303 12:27:23 11/14/23 (0)
The first two came with the EdgerHorns as purchased from Chris Brady. He had bought them new and unfinished from Bruce and had the cabinets finished with Cocobolo Wood Veneer (done by his father and brother).

I bought them from Chris when he 'upgraded' to the Cogents. Once I got back to San Francisco one of the drivers started rubbing and so I sent it to either Bruce or Orange County Speaker and they diagnosed 'rust in the gap'.

Got two used drivers from Bruce and they were VERY weak so I sent them back to be re-magnetized and one was returned to me dead. Seems they re-magnetize them with the diaphragms in but short the terminals which should protect the diaphragm but...

Not this time Sent it back and it was returned functional with a 'new' diaphragm but who knows what brand/kind. All of this in about 2008?

All the drivers I have are marked as 2441.

Consensus seems to be that of all of the after-market diaphragms out there that aluminum is best and as JBL aluminum is unobtainium, about the only aluminum available for a 2441 series is the Radian and the good news is that they sound very good.

Oh, and might I suggest a sub-woofer solution for horn lovers?

Tried about every Big Boom Box Sub (REL, etc.) and they boom but no music do I hear in the range below the Edgar mid-bass bins.

Now running two of Fitzmaurice's Table Tuba Longs, cabinets made by a guy in Phoenix. Not huge, just 12in. x 18in. x 60in. tall. Fit both in the back of the Prius. Folded with about a 10 ft. path length and a $75 Dayton driver.

Changed my listening world! From the listening position it sounds like the existing folded mid-bass horns go down to 40 Hz rather than 80 Hz. as before.

First they came for the dumb-asses
And I did not speak out
Because I was not a dumb-ass
RE: Yep, one at a time... - tomservo 11:47:03 11/14/23 (6)
Titanium is stronger for a given weight but it's a harder material to make and form and is still sensitive to metal fatigue. I have seen Ti diaphragms for a 1.4 inch exit driver that literally shattered into flakes of various sizes on touching. Avoid using breakup mode range at significant level.
- RE: Yep, one at a time... - claudej1@aol.com 08:19:35 11/15/23 (0)
  "Titanium is stronger for a given weight but it's a harder material to make and form and is still sensitive to metal fatigue. I have seen Ti diaphragms for a 1.4 inch exit driver that literally shattered into flakes of various sizes on touching. Avoid using breakup mode range at significant level." Tom Danley
  
  The last sentence is key to my success in using pro compression drivers in my homes for many years in the new millenium.
  
  In a 2" throat driver, with 4" VC, I never used shelving on the top end, going for a Super Tweeter instead (tractrix).
  
  Why amplify all those "nasty things up top" when there are so many great Super Tweeters out there from 106-111 decivel sensitivity to work with!
- If the Radian web site is to be beleived... - Ivan303 12:32:37 11/14/23 (4)
  their diaphragm is made of a 'unique aluminum alloy (aluminum, titanium, and copper)'.
  
  In a few weeks I'll know how they sound.
  
  First they came for the dumb-asses
  And I did not speak out
  Because I was not a dumb-ass
  - Radian diaphragms (Open in New Window)
  - RE: If the Radian web site is to be beleived... - claudej1@aol.com 09:50:18 11/15/23 (0)
    Enjoying mine for 2 years, for many hours weekly, along with Danley system.
  - RE: If the Radian web site is to be beleived... - tomservo 13:19:19 11/14/23 (2)
    Sounds good, i used the 475 a bunch of years ago and it was very clear sounding. Radian made their name with replacement diaphragms and some were supposed to be better than the originals and that was 20 years ago.
    - RE: If the Radian web site is to be beleived... - claudej1@aol.com 08:21:10 11/15/23 (0)
      I second the motion relative to Radian quality. Purchaser should have no worries!
    - Comforting to know... - Ivan303 07:04:49 11/15/23 (0)
      as the original JBL aluminum diaphragm for the 2441 is no longer available.
      
      First they came for the dumb-asses
      And I did not speak out
      Because I was not a dumb-ass

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