Any enclosure ideas for the "new" JX92S? - Page 3 - diyAudio
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Old 27th March 2008, 11:46 AM   #21
Colin is offline Colin  United Kingdom
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I've been in touch with Ted Jordan and alerted him to Zaph's findings, in case anything is going adrift with current units.

The first thing he noticed was that the web published spec was out on resistance and should read 6 ohms, not 4.5. Department of mea culpa as that typo was probably mine when I worked on the site. The published spec will be updated.

Ted is going to pull out a recent sample JX92S and check the spec. I'll post here when I hear from him. (Ted prefers not to join in the forums.)
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Old 27th March 2008, 02:37 PM   #22
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I hope the discrepancies will have no siginificant impact on, for example, GM's MLTLs dimensions. I am about to finish gluing the 31' version and would be very sad to know at this stage that the measures should be different.
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Old 27th March 2008, 05:23 PM   #23
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Quote:
Originally posted by Colin

The first thing he noticed was that the web published spec was out on resistance and should read 6 ohms, not 4.5.
If the other specs are 'correct', then the slightly increased BL in theory is an improvement, though I seriously doubt it would be audible in-room with any TL, MLTL alignments and my SWAG not even the tiniest sealed ones.

Anyway, looking forward to his thoughts/findings on the subject.

GM
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Old 27th March 2008, 05:28 PM   #24
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Quote:
Originally posted by A Sanchez

I hope the discrepancies will have no siginificant impact on, for example, GM's MLTLs dimensions.
Worst case scenario based on my comments here is you may want to either increase the vent length some or add a bit of stuffing inside the existing one to suit, though I imagine had these specs discrepancies not been noted you would be pleased with the design as is since the room dominates the BW they affect: http://www.diyaudio.com/forums/showt...91#post1465991

GM
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Old 7th April 2008, 03:47 PM   #25
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Quote:
Originally posted by Colin
I've been in touch with Ted Jordan and alerted him to Zaph's findings, in case anything is going adrift with current units.

The first thing he noticed was that the web published spec was out on resistance and should read 6 ohms, not 4.5. Department of mea culpa as that typo was probably mine when I worked on the site. The published spec will be updated.

Ted is going to pull out a recent sample JX92S and check the spec. I'll post here when I hear from him. (Ted prefers not to join in the forums.)
Is there any update on this? I had emailed them on March 25 and sadly there has been no response.

Perhaps I am thinking about this too much.

If you take the specified Qes = 0.58 and Qms = 1.35, I calculate Qts = 0.406 which matches the specified Qts = 0.4.

However, using the specified Fs = 45 Hz and Vas = 15.28, I calculate SPL = 85.84. Jordan has specified 88.

Is this another typo, or is it possible that have they used a specified SPL to calculate Vas?!

Am I making too much out of this? Is a 30% variation Qts no big deal?

Also, note that their impedance plots are only from 30 Hz to 10kHz. Is this why they have Re = 6 and others are measuring closer to 5 ohms?
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Old 7th April 2008, 04:02 PM   #26
Colin is offline Colin  United Kingdom
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No update received yet. Jordan commercial business is handled by EAD or the distributors. Ted is mostly consultancy now. As soon as I hear anything from Ted I'll post here.

This month's HiFi News review of the Aurousal A1 mk 2 seems to fit with the Jordan sensitivity, as far as I can tell. The mk 2 features the recommended BSC for the 8 litre enclosure so loses 3-4dB from the raw Jordan spec.
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Old 7th April 2008, 04:21 PM   #27
jkeny is offline jkeny  Ireland
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As per the title of this thread, I'm embarking on an enclosure that has not been tried before with the JX92S drivers, AFAIK (mine are not from the GB) - see the thread here: 3D Spiral Horns Anyone?

The final version I am having built, by the kindness of WoddturnerFran (as the name suggests he's a dab hand at wood & just finished some Fonkens), is this one: http://spiralspeaker.web.fc2.com/aaa...ng-ag180z.html

These cabinets are originally for the Fostex FE126E drivers & I'm wondering what, if any, changes to dimensions should be made?

Any comments/changes appreciated before wood is cut,etc?
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Old 11th April 2008, 09:50 AM   #28
jkeny is offline jkeny  Ireland
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Built these & initial reports are good: http://www.diyaudio.com/forums/showt...49#post1481149
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Old 25th April 2008, 03:26 PM   #29
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Quote:
Originally posted by gmilitano
However, using the specified Fs = 45 Hz and Vas = 15.28, I calculate SPL = 85.84. Jordan has specified 88.

Is this another typo, or is it possible that have they used a specified SPL to calculate Vas?!
How are you calculating Vas given Fs and sensitivity?
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Old 28th April 2008, 01:38 AM   #30
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You can calculate efficiency with Fs, Vas and Qes. You have to assume a density for air.

http://en.wikipedia.org/wiki/Thiele/Small
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