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Old 15th January 2010, 11:17 AM   #1
markusA is offline markusA  Sweden
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Default Jordan jx92s ML TQWT's

I've just started the "burn-in" process of my new DIY speakers, a pair of ML TQWT's .
From what I've heard the jx92s really need a long burn in before they start sounding right.
At the moment it's a lot of midrange, a little sharp treable if exactly on axis and not so much bass.
Otoh I'm not using any baffel step correction yet so the weak bass is kind of expected. It's all there just not so strong.
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Old 15th January 2010, 12:43 PM   #2
ra7 is offline ra7  United States
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I would also check the stuffing. The jordans have plenty of bass, full and fairly low.
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Old 15th January 2010, 12:51 PM   #3
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Hi markusG, wow, nice! I just got a pair of JX92S's as well.

As I'm sure you know, they are designed by Ted Jordan for off-axis listening, so they will always be too bright on-axis.

(a) is that some kind of acoustic material on the wall?
(b) what are those tubes on the floor?

Last edited by rjbond3rd; 15th January 2010 at 01:18 PM. Reason: spelling!
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Old 15th January 2010, 01:00 PM   #4
Colin is offline Colin  United Kingdom
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On axis they sound far too bright. They're meant to be 30 degrees out from the rear wall, to cross well in front of listening position. Depending on the enclosure design, they really benefit from BSC to balance out any thinness in vocals. Spoken word is a good test.

Those look very nice. Are they a variant of Peter Millet's TQWT design or one of your own?

And I'm guessing the cylinders are Musical Fidelity power amps?

Last edited by Colin; 15th January 2010 at 01:02 PM.
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Old 15th January 2010, 01:52 PM   #5
markusA is offline markusA  Sweden
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Before I do anything I plan to break them in properly.
If I can afford it I'll get some measuring equipment before I start tweakig them with stuffing and "filters".

rjbond3rd>Nah, it's just regular wallpaper looking that way. The Tubes are Musical Fidelity X-A200 monoblock's. They can drive pretty much any load...
(X-Ray CD and Nu Vista Pre-amp)

Colin>It's my own design based on an older version of Martin Kings spread sheets.
30 degrees and crossing well in front of the listening position? Well ok? I'll give it a try.
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Old 18th January 2010, 11:42 AM   #6
markusA is offline markusA  Sweden
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A few days later...
They appear to be "warming up" but it's hard to make any definitve statement about the sonic qualities at this point.
I imagine the percieved audio signature will change drastically when I begin tweeking them with BSC.
The bass really needs a boost imho.
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Old 18th January 2010, 04:16 PM   #7
Colin is offline Colin  United Kingdom
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It also depends on cabinet. GM's 48" MLTLs have, if anything, slightly too much bass (at least in my room).
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Old 18th January 2010, 07:38 PM   #8
markusA is offline markusA  Sweden
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I suppose it also depends on what you want from a speaker.
The prototype BSC will be adjustable to allow fine tuning it. After I've tuned it I'll be making a more permanent and nice looking solution. This can take a while though since I plan on getting a measuring set-up.
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Old 18th January 2010, 08:10 PM   #9
markusA is offline markusA  Sweden
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The baffle is 215mm wide in total but the edges are rounded with a 5mm radius.
Do I use 205mm or 215mm when clculating the BSC?
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Old 18th January 2010, 08:44 PM   #10
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215mm

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