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Old 19th December 2012, 09:08 AM   #11
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Quote:
Originally Posted by LineSource View Post
The Altec forum measurements(fig 1) match data from several other sources. Aluminum and Titanium diaphragms have break-up modes between 10KHz and 15KHz, but beryllium does not typically break-up until above 18Khz, and usually only above 20Khz. This SPL data shows the more extensive break-up of titanium over aluminum diaphragms.

The general viewpoint on the Altec forum is that a beryllium diaphragm has little value with a 2" exit compression driver because the 4" mechanical diaphragm plus phase plug frequency limit is below 10Khz, especially when distortion is also considered. Aluminum diaphragms typically do not start break-up until above 10Khz.

The general viewpoint on the Altec forum is that the $400+ expense of a Be diaphragm is probably only justified for a 1.4"-1.5" CD to remove Al/Ti 10K-15Khz break-up distortion, or marginally valuable for a 1" CD to avoid break-up distortion until over 20Khz(example: TAD 2001). High frequency boost compensation can now extend a flat response to near 20KHz.

Today there are plastic compression driver domes, as well as robust plastic suspensions with aluminum domes. This allows a 1" compression driver to be used at low home SPLs down to 700Hz, and cover up to 20Khz. For my home DIY experiments, these wide BW 1" CDs are the most interesting.
According to my memory; Titanium has the first break up mode at 4 kHz and Aluminium at 7 kHz. For Be I think it is 14 kHz.

I have a slight off-topic question to add. How do you guys change diaphragms without the powerful magnetic field in the gap pulling the screwdriver into the diaphragm?

best
Kris
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Old 19th December 2012, 09:32 AM   #12
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Kris,

You must use titanium or Be-Cu tools. You can't use tools the are magnetic.
Also the screws used within the CD must all be non magnetic.


Regards,
C.A.
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Old 19th December 2012, 11:06 AM   #13
more10 is offline more10  Sweden
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Quote:
According to my memory; Titanium has the first break up mode at 4 kHz and Aluminium at 7 kHz. For Be I think it is 14 kHz.
That is for a 4 inch voice coil diaphragm. For 1,75 inch voice coil diaphragms the break up frequencies should be higher.

Quote:
How do you guys change diaphragms without the powerful magnetic field in the gap pulling the screwdriver into the diaphragm?
The magnetic force at the screws is not high. I use a plain screwdriver. I am looking for titanium screwdrivers though, just to be on the safe side.
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Old 19th December 2012, 11:20 AM   #14
more10 is offline more10  Sweden
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Geez, who the hell needs TAD. Thread at Audioheritage by djnagle compairing JBL 2445 with Truextent to TAD 4001
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Old 19th December 2012, 01:54 PM   #15
winslow is offline winslow  United States
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I always used regular screwdrivers.
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Old 19th December 2012, 02:07 PM   #16
Face is offline Face  United States
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Quote:
Originally Posted by more10 View Post
I sent a message to Materion using their web form , asking for information on Truextent for Radian and Altec drivers with 1,75 inch voice coils.

I got an answer within 24 hours. They will release a diaphragm with 1,75 inch voice coil for Radian drivers in january 2013. I really hope this is not confidential :-).
Did they list which models in particular? Radian Speaker Parts - Radian Audio. Radian high frequency drivers. Radian premium diaphragms for radian, JBL, TAD, Altec and more.
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Old 19th December 2012, 02:12 PM   #17
more10 is offline more10  Sweden
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I believe all Radian 1.75 inch voice coil diaphragms are the same. It will fit both 465PB and 475PB. 450PB is not worth upgrading in my opinion.
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Old 19th December 2012, 06:29 PM   #18
Legis is offline Legis  Finland
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I have a pair of mint JBL 2446J drivers. I will pair them with (maple tree based) Yuichi A290 horns after they are ready. At some point I'm very interested to change Truextent phrams based on the very positive comments. However I cannot locate any EU source for the Truextent.
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Old 19th December 2012, 07:01 PM   #19
winslow is offline winslow  United States
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What's the equivalent model Radians found on the coaxes?
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Old 19th December 2012, 08:25 PM   #20
more10 is offline more10  Sweden
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5208C

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and 5210

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looks like

450PB

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5215B

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and

5312

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looks like

651PB

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5215 NEO

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and

5312 NEO

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looks like

760NEOPB

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