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In Reply to: RE: Aluminium! As the Brits say... posted by Rod M on November 13, 2023 at 17:27:09
First one I'm sending is the one I pulled a few years ago, because it was weak. Was after we moved to Santa Fe. I replaced it with the still working one of the original pair that came with the system. The other original had 'rust in the gap' shortly after returning to San Francisco from Utah, or so they told me, and was scrapped. Bruce found me a very used pair (actually twice, long story, ALNICO compression drivers to not travel well, first pair he found be were REALLY bad, etc.) which I have been using for years but...
I'd like to get all of them done and be done with it.
One by one leaves me with a working system. And I'd like the Radian 'aluminium' diaphragms as I'm pretty sure these are not original.
Bao Nguyen at Speaker Repair Pros will re-magnetize and replace the diaphragms with the Radian (which I can get from Parts Express for $115 and will send him) for about $50.
Shipping will be twice that for me (but not you as you live nearby).
The toobs and horns are sounding pretty good of late and it's winter here so I can't bike.
And I love my Edgar Horns. They will be buried with me somewhere in the New Mexico desert along with all my tubes.
Legal to do that here, just as long as it's not in the HOA. ;-)
First they came for the dumb-asses
And I did not speak out
Because I was not a dumb-ass
Follow Ups:
Low output sounds like they need a re-mag. Ken at Upland Loudspeaker Service can do that.
I'd have that done before messing with diaphragms.
eso
They were a carnival of American decay on parade, and they had no idea of the atrocity they had inflicted upon themselves." Henry Chinaski
Just having them replaced at the same time.
History of these (used) drivers would suggest differing and not top shelf diaphragms, especially after sending one back after recharging due to no sound and the diaphragm being replaced with who knows what?
As long as the largest cost of this exercise is back and forth shipping might as well do it right and be done with it before I get any older.
Horn wrestling is a young man's sport.
First they came for the dumb-asses
And I did not speak out
Because I was not a dumb-ass
Horn wrestling is a young man's sport.
You can do it!
I plan to spend my declining years swapping out interconnects. =:-0
First they came for the dumb-asses
And I did not speak out
Because I was not a dumb-ass
Those A drivers were my first choice for 2441's and Edgar Salad Mid Horns.
My used pair came from a EE with Apogee speakers and he did not want to ship them to another potential purchaser to CA from MI.
He was 21 minutes from my house and I had the cash.
Next to the "expensive stiffer poisonous metal powder" diaphragms in my TAD 4002's, the Aluminum ones came closest to that level of performance.
They came with ribbed and smooth versions (one each) of the Titanium diaphragms, which are now for sale.
You will like the Radian Replacments. They have a superior suspension and they Aluminum Alloy/Compound or whatever they use is First Class.
Good choice for a fellow Salad bowl owner!
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
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
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.
"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!
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
Enjoying mine for 2 years, for many hours weekly, along with Danley system.
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.
I second the motion relative to Radian quality. Purchaser should have no worries!
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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