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Old 24th November 2005, 12:02 PM   #1
smithie is offline smithie  United Kingdom
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Default jx92 tl sound quality.

hi
i know theres alot been said regarding the jx92 and teds site transmission line enclosurer but im trying to find out where ive screwed up as i find the sound quality quite a dis-appointment.
firstly the jx92 i have are the earlier versions not the s models,i state that incase that has any bearing on my sound quality.
i built the enclosures as advised on the site,made from 18mm mdf complete with the foam behind the driver.
when i first played them i was impressed by the bass extension(i had been using them in 8litre sealed enclosures before that) but then the chinks began to show...for me this is ..one hell of a over hang,boom or resonance,a hollowness around the mid bass area,also find the bass abit lazy sounding which tends to slow the music down and lacks tight defenition.
other then those points the knock on effect is those effects cloud the glorious mid range that i know the jordans do so well!
anyone out there with in depth experience with this enclosure and would share there hornest views regarding the sound quality they go from theres,any solutions ,fixes or ideas where i screwed up?
another point i must make is i use 845se valve amps(20watts) could the speakers be showing up there limitions? (they sounded really good with the sealed 8litre enclosures) volume isnt a issue,i never go pass 10 oclock on the pre-amp,believe me,thats more then load enough in my room!
on another note my amps have 4 and 8 ohm taps,which one do you think it sould be set on for this driver!.
sorry for the long post,im just gutted that my hard work has ended in such dis-appoint for me,i cant imagine mjs new speakers and the essences sounding like this otherwiose they wouldnt be getting the good reviews!
if anyone has a alteritive enclosure that would suit this older driver and give me lovely tight deepish bass with that open mid range and treble...i would be very intrested!
heres hoping!
many thanks
smithie
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Old 24th November 2005, 07:49 PM   #2
Dumbass is offline Dumbass  British Antarctic Territory
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I'd experiment with stuffing (polyester, wool, Acoustistuf, etc).

(BTW I assume you mean the VTL labyrinthine enclosure?)

Traditional TLs use a lot of stuffing to damp resonant modes. The VTL supposedly doesn't require stuffing, but given the sound quality you are describing, it may very well do the trick. I'd try stuffing the top chamber first, then if that doesn't do the trick, start stuffing down into the labyrinth.
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Old 24th November 2005, 09:52 PM   #3
smithie is offline smithie  United Kingdom
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hi
thanks for that tip,im just about to give it a go,ill let you know how it pans out!
all the best
smithie
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Old 25th November 2005, 04:55 AM   #4
JVA is offline JVA  Canada
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I found stuffing the vent with just enough pollyfill,but no more will do the trick. Also I turned the speakers enough inwards that the drivers cross in front of your seating position.
Joe
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Old 25th November 2005, 08:47 AM   #5
EC8010 is offline EC8010  United Kingdom
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It might be a lack of stuffing in the line, but you are also driving the loudspeaker from an amplifier with significant output resistance (which will cause bass boom). Perhaps you could try another amplifier to pin the problem down to the amplifier or the loudspeaker.
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Old 25th November 2005, 10:21 AM   #6
smithie is offline smithie  United Kingdom
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hi guys
thanks for all the input i am experiment now with stuffing,ive put some behind the driver and this has helped alittle,will play with the vent stuffing as well,i over did it at first and altough the booming or what ever it is was reduced so was the life to the sound...i can see this could take a while for fine tuning...the joys of diy!
hopefully i will be able to get my hands on sone a solid state power amp so i can check out to see if my amps are causing the situation( i hope not or im stuffed,if you can forgive the pun!)
thanks for all your input,advice.
on another note,do you guys think i would get a good increase in sound quality by building new enclosures out of ply instead of mdf,or do you feel it wouldnt be worth the effort?
all the best
smithie
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Old 25th November 2005, 10:37 AM   #7
EC8010 is offline EC8010  United Kingdom
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Surprisingly, MDF is actually better than plywood!
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Old 25th November 2005, 11:51 AM   #8
navin is offline navin  India
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I have heard the JX92 (older version) with SS amps (50W) and they sonuded decent to good (depending on the program material) in 8 liter sealed boxes. The sub was not built yet so we did notice the lack of bass.

from what we heard we felt that the JX92 seems to prefer solo piano and voice and stuff like that to a whole orcehstra or a rock group. i hope to listen to the speaker with the sub one day.

1. try an SS amp maybe it is the 845 amp's coupling to the JX92

2. as others suggested try damping - it should reduce but in most cases will not eliminate the resonance.

3. void free marine grade ply is as good if not better than MDF.

I have used both and even used a sandwich (Ply-mdf-ply-mdf-ply-resin bonded fiberglass-lead sheet) and and find that void free ply (most marine grade ply is void free) is just as good and easier to work with than MDF. MDF creats a lot of dust and does not bend (for curved sides) as easily as ply.
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Old 25th November 2005, 02:23 PM   #9
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Hi smithie

I also tried the Jordan JX92S Driver because when I heard it for the first time, I was impressed how a small speaker like this can sound. It was build in a small closed box, with less than 10l Volume, filled with damping wool.

This nice speaker (build by Hauke Langhein) was driven by good tube amplification. So good so far. I bought a pair JX92S.

Because I wanted to have more bass, I tried the J-Low Horm Design from N.P. But I cannot recommend this design.
It is not the perfect cabinet for the Jordan driver.

My mockup was discussed by some visitors which are true 'horn experts' and they say it is something like an open baffle with a minor horn-effect, to say the best of it

Maybe this is true. It was my fault not to think it over before it was built.

Anyway - no Problem! I tried another very small vintage coaxial driver made by Philips with a harder suspension and stronger magnet in this horn - and this was far better.

Back to the Jordan Driver: I discussed it with Markus Boldyreff who is a experienced developper for Opera Audio. He did a lot of research with the JX's and told me he has got the best results with Transmissionline.

Later I smashed the big horn-cabinet (nobody liked it) sold my Jordan chassis, because they lack on fine definition when complex music material is played and the sound tends to be hard and artificial (IMHO - this is a matter of taste)

My personal conclusion: I think it is the easiest approach to use a simple closed box for the JX. Other construction-principles like e.g. bass reflex, TML, or horn would need a lot of experimenting an tuning - this may be too much effort...

Best regards, Jo
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Old 25th November 2005, 02:25 PM   #10
RAndyB is offline RAndyB  United Kingdom
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Smithie,
I knocked up one of the VTL enclosures from the design on ejjordan site and was disappointed. Far more woolly than the TQWT I had built previously.

If your room is fairly small and rectangular, there is probably some room resonance at the same frequency as the cabinet resonance, which does not help.

I shall probably build an 8litre cabinet to try in my 15ftx12ftx9ft room. It may be that less bass is preferable to woolly bass.

An amplifier with very high damping factor is desirable - do I mean necessary? - for resonant cabinets. However, the Jordans show up any unpleasant distortion from SS amps, so choose carefully!

Do you have baffle step compensation?

Andy
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