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Old 10th October 2009, 03:27 PM   #11
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by markaudio View Post
Hi guys,


Tinitus, Good question. Like so much in this industry, there's no agreed standard.

Cheers,

Mark.
Ofcourse we do know that its NOT one way when you write 12mm Xmax

Many times it enough to KNOW the company, and how they usually spec their drivers
But sometimes it does happen that the same manufactorer use one way on some of their drivers, and peak to peak on a few of their other own drivers, which is very confusing
Its very convenient when they also spec poleplate thickness and voice coil height

Last edited by tinitus; 10th October 2009 at 03:34 PM.
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Old 11th October 2009, 12:40 AM   #12
freddi is offline freddi  United States
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build a Karlson type for it and apply some serious watts
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Old 11th October 2009, 01:10 AM   #13
GM is offline GM  United States
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Simmed as a T-TQWT indicates Vas is much too low to work in a K.

GM
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Old 11th October 2009, 01:59 AM   #14
tinitus is offline tinitus  Europe
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I wonder, why such high Fs and relatively big Xmax ?
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Old 11th October 2009, 03:56 AM   #15
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Hi Greg,
I've been made aware of the design support you've given to a competitor. We'll wait to see what others come up with in the way of box plans.

Hi Tinitus,
The windings on the coils are long + my work (and Matsubara San's) delivers a wide X-Max.

The Alpair 10 design is similar to the 12. Its well known for its linearity. You may wish to take a look at some the German reviews as their evaluations are very comprehensive. In particular Hi Fi Selbstbau:

http://www.hifi-selbstbau.de/index.p...tpage&Itemid=1

In their "Datenblatter" section under "broadband chassis" you've find the Alpair 10 review. I think its now a subscription view.

Alpair 12 and Alpair 7's are on their way to Germany and Japan, no doubt evaluations on my design and build work will be done in great depth.

Mark.
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Old 11th October 2009, 05:45 AM   #16
GM is offline GM  United States
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Quote:
Originally Posted by markaudio View Post
Hi Greg,
I've been made aware of the design support you've given to a competitor. We'll wait to see what others come up with in the way of box plans.
Greets!

Not sure who/what you're referring to nor why I should wait on others for alignment ideas.

GM
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Old 11th October 2009, 06:07 AM   #17
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by markaudio View Post
Ich glaube ich werde mich anmelden

Sure, Xmax is nice
But I will try from a different angle
This Eminence 8" have close to the similar specs (mms), but much better sensitivity
http://www.eminence.com/proaudio_spe...8&SUB_CAT_ID=2
Ofcourse not the quality of yours
If it had the higher sensitivity it might be a fine mate with Mundorfs AMT ribbon

Last edited by tinitus; 11th October 2009 at 06:22 AM.
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Old 11th October 2009, 03:23 PM   #18
freddi is offline freddi  United States
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Quote:
Originally Posted by GM View Post
Simmed as a T-TQWT indicates Vas is much too low to work in a K.

GM
Beta 8CX "works" in k with Vas of ~20 liter - I've had one mounted in a coupler of ~ 1 cubic foot rear chamber/0.5 cubic foot front - but the aperture may have to be adjusted empirically (especially at the beginning) for best overall tone and front chamber arranged so the coupled-cavity peak is livable -- does front chamber height have some control of response? Carl didn't provide any data on his experiments and ran a 10" Scan Speak in a little coupler (IIRC 27.25"Hx14"Wx12D" which by BP standards would have a big ol' cavity peak. A one fold tapering t-line might shift things away from that condition.

Beta 8CX
Total Q (Qts)
BL Product (BL)
Fs-65.52Hz
Re-5.6
Le-0.85mH
Qms-8.82
Qes-0.34
Qts 0.33
Vas-19.99 liters / .71 cu.ft.
BL-11.1 T-M
Xmax-3.2mm
Sd-210.0 cm2
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Old 11th October 2009, 04:14 PM   #19
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Quote:
Originally Posted by tinitus View Post
I wonder, why such high Fs and relatively big Xmax ?
Fs is lower than most other wide-band units of equivalent size & Xmax substantially higher while still having a very wide useable BW. That's a problem?

Quote:
I've been made aware of the design support you've given to a competitor.
Mark, I'm not sure of the context here, but FWIW, GM did a couple of (excellent) MLTLs for the JX92S a few years back, which have been on the EJ Jordan site for a long time. Recently, Jordan USA, without asking his permission, let alone offering to pay him a percentage, appear to have started selling the 48in tall design commercially.
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Old 11th October 2009, 05:51 PM   #20
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Hi Scott,
Thanks for the info.

Hi Greg,
I now understand your past situation re some of your design work. Please accept my apologies and I'd welcome any suggestions you have for cabinet designs. Is it OK to send you a message via the forum?

Hi Tinitus,
I'll explain more about the Alp 12' mechanical properties ASAP.

Cheers,

Mark.
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