Second Generation Jordan JX92S MLTL Designs - Page 3 - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 5th January 2010, 05:51 AM   #21
_henry_ is offline _henry_  Australia
diyAudio Member
 
Join Date: Jun 2002
Location: Australia
not trying to hijack the thread, but is this applicable for Alpair 10? since they have alot in common.

Anyone tried with alpair 5?

cheers
  Reply With Quote
Old 5th January 2010, 09:51 AM   #22
Colin is offline Colin  United Kingdom
diyAudio Member
 
Join Date: Aug 2003
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.
  Reply With Quote
Old 6th January 2010, 12:51 AM   #23
diyAudio Member
 
Join Date: Jan 2008
Default BSC and New Crossover

Quote:
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...
lydan01,

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: http://documents.jordan-usa.com/2nd-...2Way-Xover.pdf. 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.
  Reply With Quote
Old 8th January 2010, 08:53 AM   #24
lydan01 is offline lydan01  Australia
diyAudio Member
 
lydan01's Avatar
 
Join Date: Jul 2007
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.

Cheers!
Dru
  Reply With Quote
Old 22nd January 2010, 05:11 AM   #25
diyAudio Member
 
Join Date: Jun 2009
Location: Berlin
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.
  Reply With Quote
Old 22nd January 2010, 07:25 AM   #26
lydan01 is offline lydan01  Australia
diyAudio Member
 
lydan01's Avatar
 
Join Date: Jul 2007
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.
  Reply With Quote
Old 22nd January 2010, 09:28 AM   #27
Colin is offline Colin  United Kingdom
diyAudio Member
 
Join Date: Aug 2003
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.
  Reply With Quote
Old 26th March 2012, 04:06 PM   #28
mikelm is offline mikelm  England
diyAudio Member
 
Join Date: May 2003
Location: England
Send a message via Yahoo to mikelm
Mark,

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

mike
  Reply With Quote
Old 29th March 2012, 11:15 AM   #29
Colin is offline Colin  United Kingdom
diyAudio Member
 
Join Date: Aug 2003
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.
  Reply With Quote
Old 29th March 2012, 04:48 PM   #30
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
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)
__________________
you don't really believe everything you think, do you?
community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Jordan JX92S MLTL-48 Front Baffle Question batdan Full Range 2 2nd December 2009 08:32 AM
First Impression: GM's Jordan JX92S MLTL Speaker abpea Full Range 147 7th October 2009 11:00 PM
Aurousal MLTL using paired JX92s Nardis Full Range 31 22nd January 2009 12:46 PM


New To Site? Need Help?

All times are GMT. The time now is 01:04 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2