Jordan JX92S from EAD or Mark Audio Alpair 10? - Page 5 - diyAudio
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Old 3rd June 2009, 02:21 PM   #41
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Hi ilwooz, aha, okay you are looking to build something very specific, as opposed to the theory.

MJK's classic TL alignment tables don't cover MLTL (which can be tuned lower than a classic TL for a given rough cabinet size). Classic TL means no port tube, MLTL has the port tube (which is the ML or mass loading in MLTL).

So you might want to post questions here and one of the gurus will have excellent suggestions or will run a calculation in a tool such as Henkjan has suggested. GM can do this stuff in his head, by the way.
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Old 3rd June 2009, 02:45 PM   #42
Colin is offline Colin  United Kingdom
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I really don't think it's worth doing an Alpair VTL. The Creative Sound version is wider and deeper than the JX92 VTL, so they have clearly adjusted the line cross-section and/or increased the cavity volume. But they have already taken Ted's VTL and used it for other drivers so they have some experience with the design.

Given that Jim Griffin has already designed an MLTL, that would be the one I would go for. The triangular MLTLs do look attractive and their shape means they can go back against a wall and require no additional toe-in.

You could build it square and adjust the width vs depth to match that of the VTL, although you'd have rather a monolithic slab at the end of it. A Russian chap did a curved version of this for the JX92 48" MLTL somewhere on this forum.

Or go for the JX92 VTL, which is a proven design with some nice reviews of the commercial versions (see the HiFi News review on the MJ Acoustics site, below).

Just my thoughts. Others here will have a better idea how to approach the design of a genuine ALpair 10 VTL-style cabinet.


MJ Acoustics S1R
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Old 3rd June 2009, 06:12 PM   #43
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Quote:
Originally posted by Colin
Others here will have a better idea how to approach the design of a genuine ALpair 10 VTL-style cabinet.
Just build the VTL cabinet. The A10 should work in it -- at least as well as the VTL works.

I am suspicious of the VTL cabinet, it shows no signs of anything but classic TL design and sims show expected problems with ripple.

One could fairly easily fold the GM 48" ML-TL into a VTL-like profile, Or if one was going to use the Alpair 10 start with the Griffin ML-TL

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Old 3rd June 2009, 07:29 PM   #44
ilwooz is offline ilwooz  Italy
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Hi guys,
thanks to everybody for the replies. Actually my choice would be the Alpair 10 over the Jordan, mainly for the more accurate parameters responses compared to those stated by the manufacturer. Since I am a newbie and I have no the instruments and knowledge to do the measurements and the adjustments to solve eventual problems when the build is done, I think the Alpair should be a safer way for me. I saw the MLTL for the Alpair 10 done by Jim Griffin and for sure is an excellent design, I would try to build my speakers following this project but the cabinet is a bit too tall. This is the reason why I'm looking for a way (if exists) to adapt the aspect of one of the original MLTL 48" designs (GM's for the JX92S or JG's for the A10) to the Jordan's VTL (as I said, I like the aesthetics of the Konus Essence very much, it remainds me at the monolith of Kubrick's 2001 sorry for this "crazy" OT). The GM 31" is of course a very good alternative but, assuming to choose the Alpair 10, once again is not clear in my mind what I have to do to modify this design to fit the A10 parameters (and, eventually, to make it looks like the Konus Essence). Summarizing, the goal would be to build a pair of towers with the Alpair 10 in a MLTL less tall and more wide, with a frequency response extended and linear like the GM's 48" or the JG's 47" for the A10. However, a GM's MLTL 31" adapted to the Alpair 10 parameters would be a pleasant alternative.
Daydreaming?
Thank you so much guys and bye,
Christian

P.S. Dave, the frequency response graph you posted is very eloquent, thanks a lot...
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Old 17th March 2010, 10:09 PM   #45
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Which of these two drivers go louder? I know a few will frown at this question but its important for me. Also, am I right in thinking that the Alpair doesnt have to be 'toed in' as much as the Jordans?
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Old 17th March 2010, 11:51 PM   #46
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Quote:
Originally Posted by Bill poster View Post
Which of these two drivers go louder? I know a few will frown at this question but its important for me. Also, am I right in thinking that the Alpair doesnt have to be 'toed in' as much as the Jordans?
Hi BP,
If you're looking for a "Rock Un Roll" driver, the Alpair 10 will have its limitations. Can you give more information as exactly what you're trying to achieve? What amplification you're using? etc etc. The new gen 2 drivers are wide dispersion. Typically 7 to 12 degrees will illicit a near flat wide response.

This link to the new Gen. 2 Alpair 10 maybe useful.
Alpair 10 - Generation 2 - sneak peek

Cheers

Mark.

Last edited by markaudio; 17th March 2010 at 11:53 PM. Reason: typo mending
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Old 18th March 2010, 01:30 PM   #47
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Hi Mark, I have two enclosure designs in mind- one is a stand mounted design utilising 2 unts in each enclosure, reflex. The enclosure will be an injection moulded type.
The 2nd design is just an experimental horn type

I've been a fan of metal drivers for a while- As well as sound quality and looks, SPLs and the way the drivers behave at the low end are important- these two look to be the best full rangers within my budget.

Couple of further questions- is there a real benefit to adding a ribbon tweeter? And if the Jordans have to be toed in so much, how would this affect the tweeter axis?

Last edited by Bill poster; 18th March 2010 at 01:34 PM.
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Old 18th March 2010, 11:00 PM   #48
GM is online now GM  United States
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Originally Posted by rjbond3rd View Post
GM can do this stuff in his head, by the way.
I can?!

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Old 18th March 2010, 11:24 PM   #49
GM is online now GM  United States
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I have two enclosure designs in mind-
Sounds like a commercial venture.........

GM
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Old 19th March 2010, 12:16 AM   #50
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I can?!
Well, you can tell whether a driver/cab will work based on a few facts, yes. At least, that's what it looks like to me

Last edited by rjbond3rd; 19th March 2010 at 12:19 AM.
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