Second Generation Jordan JX92S MLTL Designs - Page 3 - diyAudio
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Old 5th January 2010, 05:51 AM   #21
_henry_ is online now _henry_  Australia
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not trying to hijack the thread, but is this applicable for Alpair 10? since they have alot in common.

Anyone tried with alpair 5?

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Old 5th January 2010, 09:51 AM   #22
Colin is offline Colin  United Kingdom
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MLTLs are usually tuned for a specific driver, so you would get compromised performance by putting in a replacement. Especially in this case, I'd have thought, as the cabinets have been refined for this driver.
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Old 6th January 2010, 12:51 AM   #23
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Default BSC and New Crossover

Originally Posted by lydan01 View Post
Thanks Jim - looks like the P-E website is still a bit flaky, at least from here. And, CSS have as much stock of the Aurum Cantus as the local reseller. Seem's like it'll be straight Jordan's for awhile yet. Not a bad thing...

Hi, as you have noted, the new 35" MLTL requires very little BSC, a few dB goes a long way when it is located near a corner and toed in as is consistently noted for the JX92S! Enjoy...

I found that a few dB is quite pleasant, so 0.5 mH to 0.75 mH with about 3 ohms should be optimal.

As far as adding a ribbon, I put together a new crossover for that! It uses a 2nd order Linkwitz Riley configuration, with 3 dB of BSC rather than the traditional 6 dB from the mini-monitor.

It is equally well suited to 7.5" or 8.5" enclosure widths, uses easy to obtain parts and a much smaller inductor for the JX92S. It also offers the benefits of LR constant phase....

The schematic and parts list can be found here: Enjoy

If you need some assistance in getting components just email me.

Mark at Jordan USA.

Last edited by mdikovics; 6th January 2010 at 01:02 AM.
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Old 8th January 2010, 08:53 AM   #24
lydan01 is offline lydan01  Australia
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Thanks Mark!

The PE site came good earlier this week and I've ordered the G2Si's. All of the bits and pieces for both crossover designs and BSC have already arrived from a local supplier so I'll make a start on those over the w'end...

All going well I should be in a position to also take some measurements in the near future.

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Old 22nd January 2010, 05:11 AM   #25
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I'm very much a newbie here but am really interested in this design. My question is, does a 30 Hz bottom end really seem achievable to everyone here? I am for sure not knowledgeable enough to critique the design, I'm just curious if this can really go that low.
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Old 22nd January 2010, 07:25 AM   #26
lydan01 is offline lydan01  Australia
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I've not yet received my mic to take some measurements but by my ears and reaction from the flatmate - if its not there, its pretty close... You aren't going to get that at huge volume in my experience to-date though.
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Old 22nd January 2010, 09:28 AM   #27
Colin is offline Colin  United Kingdom
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My 48" Jordan MLTLs put out 35Hz at a respectable volume and gave the whole sound a nice weight. If anything, it put out slightly too much bass in my room.

Bass is a question of enclosure design with these drivers. But no, you won't go to ear-shattering levels. To use at very high levels, you need a horn or separate bass units.
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Old 26th March 2012, 04:06 PM   #28
mikelm is offline mikelm  England
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Thanks for providing this nice new design - I have all of the bits now and am just about to build.

To get the best possible results, I want to have some substantial bracing between the the front & back panels - I have allowed for this with my dimensions but I have one question . . .

If I have a solid front to back brace all the way from top to bottom, instead of having one line I will now have two 1/2 sized parallel lines that amount to the same volume.

Will this arrangement completely change the behavior of the air in the line and thus demand a complete re-design or will it work pretty much the same as a single line ?

If the answer above is that it will be different can you recommend the best method to front to back bracing without disturbing the operation of this design.

many thanks

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Old 29th March 2012, 11:15 AM   #29
Colin is offline Colin  United Kingdom
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A full length brace may be overkill, especially as MLTLs don't suffer from cabinet resonances in the same way as a reflex box. Being a quarter wave, the MLTL will have resonances at specific points along its length rather than pressurising the whole enclosed space, as in a reflex.

Elsewhere on the forum, Earl Geddes has recommended a cross-brace - two pieces of timber (25mm square oak, for example) joined and connecting front-back and side-side panels. I've done this on my gen 1 Jordan MLTL and it seems to work with a solid feeling enclosure (despite being made of MDF rather than stiffer birch ply).

Hope that helps.
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Old 29th March 2012, 04:48 PM   #30
chrisb is offline chrisb  Canada
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Surprisingly, absent ( or in spite of ) thorough test data on the subject, there's no consensus among commercial or DIY builders on the subjects of "best material" or bracing

I personally use only BB or similar plywood, with full length braces on many of my builds, but would offer the suggestions to align slightly off centre line, and to cut sufficient holes to open at least 40% of the surface area. Also, in an MLTL, try to keep the CSA of lateral or front to back brace members as narrow as possible ( i.e. 3/4" x 3" or more oriented lengthwise)
on hiatus
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