Aurousal MLTL using paired JX92s - diyAudio
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Old 30th March 2008, 08:51 AM   #1
Nardis is offline Nardis  United Kingdom
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Default Aurousal MLTL using paired JX92s

There was a thread about Aurousal A1s a year back. These were stand-mounted and used a JX92 in a 10 litre box.

At the HiFi show at Heathrow, London yesterday I heard the Aurousal VS Floorstander. This used 2 JX92s per channel wired in a “line array” ie the pair were close together at ear height. Impedance was quoted as 4 Ohm so presumably they are in parallel. I was told that the tweeter (domed neodymium) was switchable according to taste and “room ambience” that the JX92s are run full range, no xover and that the design uses a BSC. (VS = virtual source and seems to be a description of line array.)

The cabinet is 20mm thick inc veneer and is a ”quarter-wav MLTL based on Martin King’s spreadsheets on DIYAudio”. External dimensions are given as 107.5mm h x 21.5mm w x 26.8mm d giving a volume of about 35 litres, a line length of 41” and a CSA of about 62 in sq. ( It seems easier to mix imperial and metric units at this point). I was also told the line is heavily damped. Port is very low on the front. Bass is quoted as 30Hz (-3db) 25Hz (-6db) and they were in corners.

I had thought about using twin JX92s myself in the 48” MLTL, and I have to say that I was pretty impressed by these. They had very good bass, a rich full bodied mid, all the speed and detail of the JX92 and only the slightest hint of cone breakup if you were listening for it. Two other JX92 owners were also impressed. I’m certainly going to have another look at a two driver design.
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Old 30th March 2008, 10:15 AM   #2
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Default Re: Aurousal MLTL using paired JX92s

Quote:
Originally posted by Nardis
The cabinet is 20mm thick inc veneer and is a ”quarter-wav MLTL based on Martin King’s spreadsheets on DIYAudio”.
Does Martin know about this?
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Old 30th March 2008, 01:28 PM   #3
MJK is offline MJK  United States
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Nope. I had never heard of the speakers and when I searched on them I don't recognize the name of the owner. Did he pull the design off of the Jordan website?
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Old 30th March 2008, 03:26 PM   #4
MJK is offline MJK  United States
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Nardis and I have taken this topic off line, thanks for the heads up.
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Old 30th March 2008, 03:32 PM   #5
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Makes sense. I won't keep the thread 'obvious' -just quickly add that it doesn't sound to me like that they are lifted from the Jordan site. The only MLTLs there are the four Greg did a few years back, none of which appear to match those dimensions.

Cheers
Scott
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Old 30th March 2008, 03:41 PM   #6
MJK is offline MJK  United States
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As I indicated to Nardis in a private e-mail, there is really nothing I can do about this type of thing. This is the second small company designing speakers using copies of my worksheets of unknown origin that I have found in the past week.
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Old 30th March 2008, 04:27 PM   #7
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Ouch. They should suffer for this. Got an idea, but I'll mention it in a PM. No point in giving them free advertising too.
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Old 30th March 2008, 05:26 PM   #8
GM is offline GM  United States
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Sometimes it's beneficial to have rowdy friends in low places..........

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Old 31st March 2008, 12:08 PM   #9
Colin is offline Colin  United Kingdom
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Definitely not the MLTLs from the Jordan site but I bet it inspired them. I'll mention this to Ted and see if we can beef up the wording on the Jordan site to indicate that any designs based on or derived from the MathCad spreadsheets should be licensed from MJK.

The speaker doesn't appear on their website yet so maybe they were testing a design before licensing the software, but even so ...

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Old 31st March 2008, 12:40 PM   #10
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Hmm. Looking at the available data on the speakers, references to Martin are mysteriously absent, so they might either have been economical with the old actualite at Heathrow, or this could be another successful rip-off of Martin's worksheets.

That said, if the Aurousal people do indeed frequent the forum, perhaps they'd like to join the thread and clarify these questions. It would certainly be in their interest to do so.
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