Radian 2218 NEO? 21mm x-max - Page 2 - diyAudio
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Old 29th October 2012, 09:19 PM   #11
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Quote:
Originally Posted by weltersys View Post
The Mms of a single 18TBW100 is 268.2 grams, (with a Sd of .1210 m2) it is a very stiff cone suitable for the high pressures encountered in a TH, almost overtbuilt for BR use.

Art
After re- reading the Radian 2218 specs, realized it was an 18" with an error in the SD specifications:

Surface Area of Cone (Sd)m2 .2269 m2 (should be around .12 m2)

I had thought it was a 22" or some such monster.

The diaphragm mass of (Mms) 236.2 grams, if correct, is reasonably beefy, though I still would reserve judgement about how well it would hold up in a tapped horn pushed to an Xmax of 21.3 mm, if that specification is correct.

Art
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Old 2nd November 2012, 11:13 AM   #12
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Originally Posted by weltersys View Post
I had thought it was a 22" or some such monster.

Art
Well there is this but it is OEM only and probably three times the price.
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Old 2nd November 2012, 12:26 PM   #13
epa is offline epa  Netherlands
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Originally Posted by mr. doom View Post
Well there is this but it is OEM only and probably three times the price.
this driver is especialy made for the powersoft ipal mod amp module.
more here
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Old 2nd November 2012, 03:40 PM   #14
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I followed up with Radian on the Xmax specification for this driver.

According to the response I received, the stated "21mm Xmax" is peak-to peak instead of the usual one-way Xmax specification. So this driver actually has a 10.5mm Xmax when you use the usual way to assign this number.

-Charlie
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Old 2nd November 2012, 04:02 PM   #15
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Default Ah marketing.

Quote:
Originally Posted by CharlieLaub View Post
I followed up with Radian on the Xmax specification for this driver.

According to the response I received, the stated "21mm Xmax" is peak-to peak instead of the usual one-way Xmax specification. So this driver actually has a 10.5mm Xmax when you use the usual way to assign this number.

-Charlie
Would not have expected that from Radian, I thought they were giving the VC overhang?
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Old 2nd November 2012, 04:04 PM   #16
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Quote:
Originally Posted by CharlieLaub View Post
I followed up with Radian on the Xmax specification for this driver.

According to the response I received, the stated "21mm Xmax" is peak-to peak instead of the usual one-way Xmax specification. So this driver actually has a 10.5mm Xmax when you use the usual way to assign this number.

-Charlie
Thanks for the insight, the Xmax looked unreal considering the surround.

Radian certainly wants a lot of money for a driver with about the same Xmax of a BC18TBX100.
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Old 8th November 2012, 12:13 PM   #17
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Did you get the 3015 yet?
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Old 9th November 2012, 01:58 PM   #18
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Default Surround.

Quote:
Originally Posted by weltersys View Post
Thanks for the insight, the Xmax looked unreal considering the surround.

Radian certainly wants a lot of money for a driver with about the same Xmax of a BC18TBX100.
I have not researched the TC sounds PRO5100 18" but is claims 31mm x-max with a accordion surround and the 21IPAL has 21mm. So it may be possible for these "pro" drivers to have longer travel, (not that it will make them exponentially better).
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Old 9th November 2012, 10:16 PM   #19
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Originally Posted by mr. doom View Post
I have not researched the TC sounds PRO5100 18" but is claims 31mm x-max with a accordion surround and the 21IPAL has 21mm. So it may be possible for these "pro" drivers to have longer travel, (not that it will make them exponentially better).
These drivers will do that much and the surrounds will physically go that far but the linearity past 20mm is questionable. Typical pro drivers have a geometric xmax in the 8-10mm range so by 20mm they have lost a lot of motor force and become very non linear anyway with compression and greatly increased distortion by that point.

The 5100 has a 19mm geometric xmax as does the bms 860 and 862. The 18 and 21 ipal are about 15mm overhang. These are the longest stroke pro drivers Im aware of. The Radian appears to be 10.5 mm which is about average for modern extended LF pro subs.
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Old 10th November 2012, 05:59 AM   #20
ZivkoF is offline ZivkoF  Slovenia
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Quote:
Originally Posted by mr. doom View Post
I have not researched the TC sounds PRO5100 18" but is claims 31mm x-max with a accordion surround and the 21IPAL has 21mm. So it may be possible for these "pro" drivers to have longer travel, (not that it will make them exponentially better).
Xmax = ((winding depth - magnetic gap depth)/2 + (magnetic gap depth)/3

TC sounds PRO5100 Xmax = ((76,2 - 38,1)/2 + 38,1/3 =
= 19,05 mm + 12,70 mm = 31,75 mm
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