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Tymphany's new +/- 45mm woofer
Tymphany's new +/- 45mm woofer
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Old 31st December 2017, 11:10 PM   #11
Windforce85 is offline Windforce85  Poland
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Originally Posted by Brian Steele View Post
Those specs actually look pretty good. Xmax is slightly low for car audio use, but efficiency is pretty high. Have you actually had one of these drivers on hand for testing?
I am sorry but this driver has not any specs. I cannot find it's Re and BxL figures? It lacks fundamental information about true motor performance. Please not take voltage efficiency into account for sub-bass duties as it is calculated for 1kHz after theoretical FR flat-out and far away after any subwoofer filters range.

Tymphany driver is OK for subwoofer duties but nothing spectacular. Just another cost-effective driver designed for car sealed DSP box in 15-inch range.

Last edited by Windforce85; 31st December 2017 at 11:14 PM.
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Old 31st December 2017, 11:29 PM   #12
Brian Steele is offline Brian Steele  Grenada
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Originally Posted by Windforce85 View Post
I am sorry but this driver has not any specs. I cannot find it's Re and BxL figures? It lacks fundamental information about true motor performance. Please not take voltage efficiency into account for sub-bass duties as it is calculated for 1kHz after theoretical FR flat-out and far away after any subwoofer filters range.
It's a DVC driver, with a quoted impedance of 4 ohms per coil. Re isn't given, but it's likely somewhere between 3 to 4 ohms. From this, you can use Hornresp to calculate the possible range of values for BL, given the other published parameters and a guess at Sd. Nothing beats having the actual driver on hand for testing of course.
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Old 31st December 2017, 11:40 PM   #13
Windforce85 is offline Windforce85  Poland
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I agree with you Brian but only low price of this transducer excuses all this 'guessing' about its low-level performance, not telling large signals, as Klippel does...
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Old 31st December 2017, 11:51 PM   #14
globalplayer is offline globalplayer  Germany
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Quote:
Originally Posted by Brian Steele View Post
Those specs actually look pretty good. Xmax is slightly low for car audio use, but efficiency is pretty high. Have you actually had one of these drivers on hand for testing?
Actually I got 5 of those, but the carbon copy european Alpine SWG-1244 version it has only a single 4 ohms voice coil.

Very good sounding and good materials/construction.
Infact very impressive considering the price point.
Cone is relatively light and very rigid.
xmax is 11.5 mm actually.
It is impossible to destroy it mechanically, only electrically.

I talked to the engineer in a german forum about construction/engineering:

Mivoc AWM 124 in 6th order Bandpass - Seite 2

If you can translate, maybe google.

It is more of a low distortion sq woofer.
On the pics they look exactly the same so I guess they are, apart from the dvc.
Also the pdf has the same specs listed.

To be sure here is the original:

Alpine SWG-1244 30cm subwoofer 250 WRMS 4 Ohm | eBay

Even the higher price and shipping it will be worth it.
But I think they are the same.
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Old 31st December 2017, 11:59 PM   #15
globalplayer is offline globalplayer  Germany
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Originally Posted by Windforce85 View Post
I am sorry but this driver has not any specs. I cannot find it's Re and BxL figures? It lacks fundamental information about true motor performance. Please not take voltage efficiency into account for sub-bass duties as it is calculated for 1kHz after theoretical FR flat-out and far away after any subwoofer filters range.

Tymphany driver is OK for subwoofer duties but nothing spectacular. Just another cost-effective driver designed for car sealed DSP box in 15-inch range.
Theres a pdf on the site.

Re is 2 x 3.6 ohms for the dvc
BxL is around 15-16 Tm for the single 4 ohms vc Alpine SWG-1244 version if I remember right, maybe a little higher.
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Old 1st January 2018, 11:55 AM   #16
Ron E is offline Ron E  United States
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This thread sure has a deceptive title.
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Old 1st January 2018, 03:45 PM   #17
phivates is offline phivates  United States
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Huge xlim fits with kilowatt amplifiers - and we all need that headroom right?
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Old 1st January 2018, 05:57 PM   #18
Reactance is offline Reactance  South Africa
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This is the same woofer that powers the SVS PB 16 Ultra. with an inch bigger.
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Old 1st January 2018, 11:12 PM   #19
GM is offline GM  United States
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Originally Posted by Ron E View Post
I wonder how it could do in a tapped horn?
Too big [~350 L net tuned to Fs] for the amount of usable output [~125 dB 30-80 Hz/1pi/400 W] due to a low compression ratio. 3500 W/45 mm adds another ~10 dB of horrible distortion?

GM
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Old 2nd January 2018, 12:06 AM   #20
mordikai is offline mordikai  United States
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This thread sure has a deceptive title.
Haha!
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