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Old 19th December 2012, 07:29 PM   #21
more10 is offline more10  Sweden
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Only 5208C and 5210 can be fitted with Truextent diaphragms. All other have 3 inch voice coil. But, the 450PB is not their best one inch driver. However, all their one inch drivers have the same mounting, so it should be possible to mount a 465PB or a 475PB on these coaxes.
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Old 19th December 2012, 07:32 PM   #22
more10 is offline more10  Sweden
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Quote:
I believe all Radian 1.75 inch voice coil diaphragms are the same
What I meant was that all Radian 1.75 inch voice coil for Radian drivers are the same.
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Old 19th December 2012, 08:35 PM   #23
winslow is offline winslow  United States
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But you can't change the drivers on them...or so I am told.
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Old 19th December 2012, 08:36 PM   #24
winslow is offline winslow  United States
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The 512/2B is a 1" exit driver too.
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Old 19th December 2012, 09:26 PM   #25
pos is online now pos  Europe
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Quote:
Originally Posted by Legis View Post
However I cannot locate any EU source for the Truextent.
Guido is the official distributor in europe:
Behringer electric - Beryllium zum Nachrüsten!
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Old 20th December 2012, 07:59 AM   #26
more10 is offline more10  Sweden
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Quote:
Originally Posted by winslow View Post
The 512/2B is a 1" exit driver too.
Its a ceiling speaker.

508/2B

Click the image to open in full size.

512/2B

Click the image to open in full size.

Both looks like 450PB to me.

I found another one, 5212B, but it must be a typing mistake by USSpeaker:-)
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Old 20th December 2012, 08:15 AM   #27
more10 is offline more10  Sweden
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Quote:
But you can't change the drivers on them...or so I am told.
One can always ask Radian for one where they swapped the compression driver at manufacture. If there are enough audiofiles asking for this maybe they will introduce a new product.
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Old 20th December 2012, 10:25 AM   #28
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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.
Do you mean Lansing Heritage forum? Best to credit the author properly so the correct person can take responsibility for any errors.
The notes appear to be incorrect. The 2450SL is not aluminium, it's Ti. So the subsequent discussion based on this chart's results about Al versus Ti. is pointless if so.
I do think that you are correct that the 1.5" exit CDs are the way to do it. Better in several ways despite the sentimental attachment to "classic" 2".

Best wishes
David

Last edited by Dave Zan; 20th December 2012 at 10:30 AM.
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Old 20th December 2012, 02:20 PM   #29
more10 is offline more10  Sweden
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Quote:
2450SL is not aluminium, it's Ti
It is aquaplassed ti. As good as or better than aluminium
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Old 20th December 2012, 02:22 PM   #30
JoshK is offline JoshK  Canada
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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 :-).
Hey, that is pretty cool news. I've been very interested to see what a Be diaphragm would do for a 1" CD.
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