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Old 15th March 2006, 02:16 AM   #1
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Default Jx92s VTL

I am considering for my first full range speaker project a Jordan JX92S Transmission Line design. Has anyone here done a similar project? It seems like a great driver for under $400 a pair.
Less pulp more juice Twisted Pear Audio.
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Old 15th March 2006, 05:01 AM   #2
maxro is online now maxro  Canada
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You didn't do a search, did you? Having heard neither myself, it seems that GM's MLTL designs are preferred here over the VTL from the Jordan site.

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Old 15th March 2006, 06:09 AM   #3
Dumbass is offline Dumbass  British Antarctic Territory
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Originally posted by maxro
it seems that GM's MLTL designs are preferred here over the VTL from the Jordan site.
I forget who modelled the VTL using Martin King's software; anyway, the VTL was designed BEFORE that software was available.

I tend to agree, the two GM designs (31" and 48") look awfully good and have gotten good reviews.

One nice thing about the VTL is the wide baffle. I think that's a big part of why it sounds so good. Also, I think the VTL performs better in-room than modeling would indicate.

One could do a lot worse than a pair of JX92S.
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Old 15th March 2006, 06:17 AM   #4
richv is offline richv  Netherlands
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Default Different MLTL-48 designs

BTW - does anyone know why the MLTL-48 from the Jordan site is smaller then the one originally posted by abpea? Is one more evolved then the other - is there a preference?

New 48" ML-TL Review


Thanks, Richard.
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Old 15th March 2006, 11:50 AM   #5
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Sincere thanks to all of you for the great ideas and links.

I did search a bit (for about an hour) but was not finding the concise view I recieved here. Sorry if I inconveinanced any of you.

I will post more on my experiences as I build these speakers. These are nice drivers, I am very impressed with the quality out of the box.

Less pulp more juice Twisted Pear Audio.
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Old 15th March 2006, 12:52 PM   #6
Tintin is offline Tintin  Sweden
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I am considering building speakers with the JX-92S driver as well and it ends up in either GM's cabinets (most likely the 48") or in Peter Milletts MLTQWP (alphabet soup extraordinaire these assignments) found at http://www.pmillett.com/jx92s.htm. RAndyB reported building some designs on the driver and was not very happy with the VLT and I think he eventually used Peters design.

I suppose either of the GM31 or the GM48 cabinets would have their own merits, Colin hinted that someone preferred the 48" to the 31" while the 31" could give a more accurate response http://www.diyaudio.com/forums/showt...280#post789280

Has anyone auditioned both? Opinions on Peters design?

// Jonas
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Old 15th March 2006, 05:07 PM   #7
Colin is offline Colin  United Kingdom
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Hi - Bruce (abpea) built both MLTLs (and the VTL). GM has mentioned a couple of times that the 31" is the more accurate, closer to a true monitor. The 48 veers towards a musical instrument presentation.

I'm using the 48" and find it an addictive speaker to listen to, with really engaging bass (without sounding overwarm or full). Note that this is on some quite nimble-sounding Naim amps, so others may not suit. The Gainclone should be a good match, from the descriptions I've read.

I've heard the VTL, which I liked but didn't feel had the bass reach of the MLTLs - though it wasn't a side-by-side comparison. If you keep the internal cross sectional area the same, you could build a wide baffle version of the MLTLs. Bruce has done this and retained the triangular cross-section. I went for the triangle shown on the Jordan site. (The measurements there came from GM and should be the final spec.)

BVruce's review of the various MLTL variants is here.

One more thing -protect the drivers when you're fitting them as it only takes a dropped bolt to gain a dent. Mark Audio sells some neat plastic covers which fit onto the driver bolts with magnets. You take 'em off to listen and fit back on quick when there are children and/or animals around. (Why do dogs like to stuff their noses directly against the source of sound when a loudspeaker is playing?)
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