Jordan JX92s - Supravox 165 GMF - Veravox 7x - Page 3 - diyAudio
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Old 22nd July 2006, 12:41 AM   #21
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dezzz,

Let me inject a suggestions (or second Colin's suggestion in his first post in this thread): Build the GM MLTL (48" or 31" version) for the JX92S instead of the VTL. The MLTLs are very simple to build and yield very good results. You would attain more bass than your bass reflex cabinents and be very satisfied with the results.

In most any configuration you'll need baffle step compensation to improve the balance of the JX92S.

Jim
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Old 22nd July 2006, 07:28 AM   #22
dezzz is offline dezzz  Denmark
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My intention with the VTL was to put it right up against the back wall, to create the illusion of a almost infinate baffle. But maybe the cabinet is not shallow enough to achieve this effect?

I did come across that Jordan Horn, and it looks very nice. But that rather large peak around 150 Hz's doesn't look good. The CSD on the other hand, compared to the CSD Klang + Ton published on their take on the VTL, look almost too good to be true.

I had a second look at Colin's recommended enclosure yesterday. It sounds nice, but bass reflex? I typically don't like these designs. I prefer a closed design, where you can still sense the lowest bass frequencies, maybe it is the not so steep rolloff that makes them sound much better. And the improved transients. That is why I thought that a Transmission line of some sorts might be the best choice for me... I really would prefer a design that favours transients over bass.

But please tell me more on those MLTL designs. What version would suit be best considering what I said above. And in what areas would this design beat the VTL's? Again how would I fight baffle step. I would hate to put any electrical components in front of the JX92s.

Thank you once again for your fast replies!
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Old 22nd July 2006, 05:57 PM   #23
dezzz is offline dezzz  Denmark
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I was looking at the MLTL-31, and read that as long as I keep the cross section around the 195cm², and the height of 31" I guess, I can change the shape as I see fit. This is very close to the 184cm² cross section and 32,5" height of the VTL. When I construct my loudspeakers I almost always keep it all together with screws so I can go back on my decisions, I am never quite sure that I am making the right decision :0)

So this fact, that the two are potentially quite like each other, might prove to be exactly what I need. This way I could start of with a closed box, then test the MLTL by adding a vent to the bottom, and finally I could if not satisfied yet try the VTL. And ofcause the backplate would be bolted on, so that I could always remove that and compare to an open baffle solution.

I would most likely be going for a very shallow design with a depth of 11cm and a width of 40cm(external measurements), with a curved front baffle. And the height around those 31" internal.
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Old 22nd July 2006, 10:31 PM   #24
ScottG is offline ScottG  United States
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I'd ask Nelson Pass what his take on the audible difference is between the J-Low and other designs.

(he sometimes is around here, but you can almost certainly "ping" him on his forum section)

http://www.passdiy.com/speakers.htm

Of course the Jordan Horn isn't a J-Low.. but it isn't bad either..

Here is another subjective source on differences - including the addition of corrective networks. They are not your drivers.. but it should give you a general impression..

http://www.tnt-audio.com/casse/lowtherpm2a_e.html

Also note that neither horn uses mdf - however here is a horn that does use mdf, BUT notice what the manufacturer mentions about making mdf "work"..

http://www.6moons.com/audioreviews/gemmeaudio/108.html



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Old 23rd July 2006, 06:41 PM   #25
Colin is offline Colin  United Kingdom
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The original VTL design on the Jordan site allowed for building as a closed, vented or TL box. From recent comments by GM, the 31 MLTL would give you an accurate sound, slightly less full in the bass than the 48 but the 48 is an excellent speaker. The MLTLs aren't exactly reflect enclosures - there is more about them on MJK's site

You could use the JX92 and JX53 together, which would reduce the forwardness of the 92. The crossover point would be first order 500Hz but the 92 would need reducing in output level to match the 53. It's not easy and personally I don't think it's worth all the bother.
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Old 23rd July 2006, 07:51 PM   #26
dezzz is offline dezzz  Denmark
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Yes I thought about using the JX92s and the JX53 together at first, but the break in has really started to do wonders on the JX92s. They are no longer as rough, and the imaging seems to grow larger and larger :0)

I must say that I am very drawn to the shallow design, both because of the baffle step, but mostly because of the remark I read on the Jordan site, adressing wether the shallow depth of the cabinet would have a bad influence on standing waves, and waves exiting back through the cone. The reply was, on the contrary. I have a few sheets of PC noise dampening sheets that I think would do an excellent job just behind the driver. Also considered the deflex panels, but I have read very different reviews of them, so they can wait.
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Old 23rd July 2006, 11:47 PM   #27
ScottG is offline ScottG  United States
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You might try the 53 as an ambiance "filler" in a reflective horizontal omni design..

see the "Klang und Kunst" photo:

http://www.ennemoser.com/user.html
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Old 24th July 2006, 12:42 AM   #28
dezzz is offline dezzz  Denmark
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Ahh yes that looks interresting :0) Much better than keeping the driver on a shelf in a box.

And even if the result is disappointing, it would still be very nice if it had a switch, so you could turn it on when leaving the sweetspot, enabling a low frequency crossover. I will definately try this when I finish the new cabinets. Thank you Scott! Now if only I enjoyed working with wood as much as I enjoy reading about doing it...
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Old 24th July 2006, 09:18 AM   #29
Colin is offline Colin  United Kingdom
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Don't start slooshing C37 or any other treatment on the Jordan cones or you'll muck them up.

The shallow profile cabinets work quite well - the triangular ones work even better. But the shallow profile, wide panel boxes do look very smart. Felt or BAF wadding behind the drivers is all that is needed with either. I've heard varying opinions on the Deflex panels.

Regarding the 53 - I don't think these are needed with the Jordan JX92 designs; there isn't a sweet spot - you can move about without losing imaging (that's the reason for the rising HF response, which compensates for the extreme toe-in). In any case, the 53 is about 3dB less sensitive, so I'm not sure you'd hear it. With care, and a good filter, you could use them as very small speakers on their own for nearfield use.
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Old 25th July 2006, 03:59 AM   #30
navin is offline navin  India
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Quote:
Originally posted by ScottG
You might try the 53 as an ambiance "filler" in a reflective horizontal omni design..
How low can the JX53 or JxR6 go?
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