Thiele Small Parameter like Focal Audiom 15AX from currently available - diyAudio
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Old 16th August 2011, 10:45 PM   #1
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Default Thiele Small Parameter like Focal Audiom 15AX from currently available

I am looking arround to low frequency transducers like Focal Audiom 15ax.
Especially the values for Vas (635 L) and Cms (the driver's mechanical compliance = reciprocal of stiffness, in m/N) so as Qms are exceptionell large and the resonance frequency f-res is very low (22,8 Hz). This value is by the use of cloth surround instead rubber very noteworthy and an indicator for a very low weight (mass) of the diaphragm (cone).
All this features saves an unparalleled combination of clean and tight bass so as a very low bass at the same time, if the camber volume is appropriate therefore.

Drivers with similar parameters that I know are the follow:
- Cabasse 55ND
Cabasse haut-parleur 55ND
- HKM XX-21
(formerly WESTRA/TESLA, see attachement)
- 2x McCauley 6258
McCauley.com : Products: Components > 6258: Specifications

Unfortunately the Cabasse 55ND is too expensive and the HKM XX-21 has to strong variations between the individual devices.
From the McCauley 6258 I use two pieces in one chamber. Unfortunately in the meantime very expensive in Europe (and amazingly not in United States), now twice as expensive than 14 years ago by German's old distributor "Sirius".

Which additional currently available bass drivers in this size have similar parameters (as close as possible to the Audiom 15ax for use in large cabinets, i. e. VAS between 500-800L, f-res. below 25 Hz and Qms above 10)?

Thank you for any hints.
Attached Images
File Type: jpg Focal Audiom15AX Thiele-Small large Font.jpg (246.1 KB, 141 views)
File Type: jpg Focal Audiom15AX Thiele-Small.jpg (148.0 KB, 139 views)
Attached Files
File Type: pdf XX-21.pdf (104.9 KB, 5 views)

Last edited by tiefbassuebertr; 16th August 2011 at 11:05 PM.
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Old 20th August 2011, 02:13 PM   #2
Scott L is offline Scott L  United States
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Default Might be worth trying

Search "Magnat" speakers, made right there in Germany, or at least at one time they existed. They made the woofer driver for an early version of the Wilson WAMM.
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Old 21st August 2011, 11:33 AM   #3
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Quote:
Originally Posted by Scott L View Post
Search "Magnat" speakers, made right there in Germany, or at least at one time they existed. They made the woofer driver for an early version of the Wilson WAMM.
Mean you the Aggressor 6000 about this image URL's ?
http://www.bilderzumanziehen.de/bilda/aggressor_h.jpg
http://www.bilderzumanziehen.de/bilda/aggressor_s.jpg
http://www.bilderzumanziehen.de/bilda/aggressor_v.jpg
This loudspeker I had to check a few years ago. And I realized, that he had high mechanical and non linear losses (low value for Qms) probably cause poor material properties from surround and spider.
Thus the sound of the OMEGA sub woofer about
http://www.ms-technik.de/sub.htm
in the low level aera is bad and only useful (but not really good) by middle audible levels.


BTW - by chance I read about the URL
http://www.naimaudio.com/news/article/3395
http://www.focal.com/en/home-audio-l...l-and-naim.php
follow:
United by their passion for perfect sound, leading high-end audio brands Focal and Naim, today announce they are merging to create a new European leader in the audio industry. Focal & Co will own and manage Focal and Naim as independent brands, retaining their unique philosophies and product ranges.
and here the German version:
http://www.i-fidelity.net/news/detai...aim-audio.html

Last edited by tiefbassuebertr; 21st August 2011 at 11:49 AM.
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Old 11th January 2014, 09:56 AM   #4
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are there any news?

check out also this thread:
FS: 2 FOCAL Audiom 15AX 15" efficient woofers
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Old 12th January 2014, 08:12 PM   #5
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Do you consider only 15" drivers or other sizes (12"/18")?
Do you only want actual driver productions or can also be discontinued replaceable models?
The surround has to be the same fabric surround or can it be made of different material like foam/rubber surround?
Your objective is?! The same internal volume/extension/SPL as the original, other... what's the net volume of the application and extension and SPL required (approximate).
One possible replacement of the same size would be the Fostex FW407/Fostex FW405.
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Old 12th January 2014, 08:26 PM   #6
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Actually the GPA 416-8B (16B) (not the GPA 416-8C) is a direct replacement with ~/-1.5dB. http://www.greatplainsaudio.com/
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Old 26th January 2014, 10:05 AM   #7
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Quote:
Originally Posted by Inductor View Post
Do you consider only 15" drivers or other sizes (12"/18")?
Do you only want actual driver productions or can also be discontinued replaceable models?
The surround has to be the same fabric surround or can it be made of different material like foam/rubber surround?
Your objective is?! The same internal volume/extension/SPL as the original, other... what's the net volume of the application and extension and SPL required (approximate).
One possible replacement of the same size would be the Fostex FW407/Fostex FW405.
I am looking for all sizes. I am looking only for currently available driver (actual driver, as you say).
Most important things in geenral are follow (for large cabinets):
1) high value for VAS
2) high value for Qms (low Rms)

Precision Devices' PD184 match the requirements in most cases - go to
PD.184

But there are special situations with special requirements sometimes (e. g. lower sizes or extended frequency area up to 300 Hz etc).
Thus I want to have an extended overview (line-up) of the most exist and currently manufactured bass transducers on the marked in this kind.
The mentioned brands about
Bumper Industries, Zeuz/Bumper Speakers, new Website through trouble vs. Earthquake?
could have also produce speakers in this kind, but there are no distributors in europe.

Quote:
Originally Posted by Inductor View Post
Actually the GPA 416-8B (16B) (not the GPA 416-8C) is a direct replacement with ~/-1.5dB. http://www.greatplainsaudio.com/
excellent advice - thank you very much;
very similar to this:
http://www.supravox.fr/anglais/haut_...0_2000_EXC.htm

Last edited by tiefbassuebertr; 26th January 2014 at 10:10 AM.
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Old 29th January 2014, 07:21 PM   #8
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Quote:
Originally Posted by tiefbassuebertr View Post
very similar to this:
400 EXC SUPRAVOX
I wouldn't call a field coil similar, but you can certainly regulate the power supply for the necessary adequate behavior.
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