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Multi-Way Conventional loudspeakers with crossovers

BMS 4592 vs Radian Beryllium
BMS 4592 vs Radian Beryllium
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Old 14th April 2018, 11:45 AM   #11
bjarnetv is offline bjarnetv  Norway
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i pulled out the calipers, and the internal construction is something like this, making the exit angle around 5 degrees unless my math is bad (it usually is )
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File Type: jpg IMG_3375.jpg (447.6 KB, 458 views)
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Old 16th April 2018, 02:48 PM   #12
bjarnetv is offline bjarnetv  Norway
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i guess my post-it sketch might be a bit confusing, so here is a better drawing.
475.jpg
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Old 16th April 2018, 07:07 PM   #13
Audiodidakt is offline Audiodidakt  Norway
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I got the include angel for that driver from Radian some years ago. Will check my emails tomorrow.
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Old 17th April 2018, 06:38 AM   #14
phase_accurate is offline phase_accurate
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Googling "Radian 745 Exit angle" leads to:

https://www.parts-express.com/pedocs...ta%20sheet.pdf



I wonder how good a match it would be with this one (made for a driver with 10.5 degrees exit angle):

CIARE ITALIAN SPEAKERS - PRO AUDIO B2B: PR 614 HORN 1.4 INCH

BTW: Vance Dickason tested the Radian 745 with both versions of diaphragms:

The 745NEOBe Compression Driver from Radian Audio | audioXpress


Regards

Charles
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Old 17th April 2018, 07:34 AM   #15
bjarnetv is offline bjarnetv  Norway
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There appears to be a slight, almost minute difference between the 745 and 475 drivers though

but seriously, unless the "online taper degree calculator" is messing with me, the exit angle is 5
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Old 17th April 2018, 09:13 AM   #16
phase_accurate is offline phase_accurate
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Ouch, sorry for that !!!

I would say the Exit angle is also 10 degrees on that one from your measurements:

2 x arcsin (2/23) = 9.97

Regards

Charles
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Old 18th April 2018, 03:43 AM   #17
hum4god is offline hum4god  United States
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Default 475 exit angle

exit angle.PNG

exit angle on the right in mm
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Old 18th April 2018, 03:57 AM   #18
Cableaddict is offline Cableaddict
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Quote:
Originally Posted by SpinMonster View Post
I know this is an old thread but after I bought Radian 475 Beryllium compression drivers from us speaker, I tried 5 times with e-mail for support and never got any response to my requests to know the exit angle of the driver and to see response graphs. Nothing was supplied with the drivers themselves as far as this basic and very needed information.
Call back and ask specifically for Dennis Stamatoiu. He the one person there that knows all the tech inside & out.

They are definitely not good with supplying graphs & other test data, though.

Also, from doing a lot of reading, in the recent past Radian has been guilty of playing fast & loose with the facts, so caveat etc....

But Dennis is very cool.

Other notes:

1: Whatever product you use, make sure it's made with pure beryllium. Evidently there's a lot of stuff now made (more cheaply) with other materials & a beryllium overlay, or whatever, and it's marketed the same but is very definitely NOT the same.

2: Consider other options with new technology. Some B&C titanium drivers use new polymer surrounds (polymide?) which they claim smooth out the sound of titanium, and Radian does something similar with their aluminum (not titanium) diaphrams.

In a perfect world, I'd want to audition all these options before spending all that money on Beryllium. (Even though I probably will. )
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Old 18th April 2018, 09:43 PM   #19
weltersys is offline weltersys  United States
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Quote:
Originally Posted by Cableaddict View Post
2: Consider other options with new technology. Some B&C titanium drivers use new polymer surrounds (polymide?) which they claim smooth out the sound of titanium, and Radian does something similar with their aluminum (not titanium) diaphrams.
Altec Lansing introduced the polymer surround 808 aluminum diaphragm around 1973, as I recall.
B&C and Radian (and many others) make some fine drivers, but nothing new about using polyamides, or charging 6 times as much for a Be diaphragm surrounded by the stuff...
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Old 18th April 2018, 10:16 PM   #20
dpunk is offline dpunk  United States
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The Electro Voice DH-1012, DH-2012 and DH-1506 also used polyimide surrounds with aluminum diaphragms. They date from around 1975.
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