GM JX92S MLTL-48 Triangle (JIT for UK Meet) - 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 17th July 2007, 08:55 AM   #1
diyAudio Member
 
Join Date: Feb 2007
Location: Leeds
Default GM JX92S MLTL-48 Triangle (JIT for UK Meet)

Hello
I have had a pair of JX92S in the project to-do-list since the end of 2004. Funny thing my project stack is not FILO of FIFO a random collection of events occationally trigger activity on one or sometimes several projects. Some continue to completion (or as near to completion as I ever finish a project) some get advanced or a few extra components sourced and pushed back on the stack. There is nothing quite like a deadline to spur activity (think: last minute homework and exam revision etc). So out with the MDF. Apparently the 48 is more popular than the 31. The triangular is more of a challenge than the square box. I like to mitre so how to cut 60 degrees when the saw only adjusts to 45? I added a 15 degree offset to the saw base plate as shown:

Click the image to open in full size.[/IMG]

Usually for boxes I use 18mm MDF for all the sides and 25mm for baffles but with only three sides I went for 18mm. If I were to make them again I would use 25mm.
I have used Dedsheet panels before but this time I had a bit of roofing felt spare so cut that in to strips and used Evostick solvent free contact glue (much easier to use than the smelly stuff).
I cut and rounded over some off-cuts to brace the sides and front. Leave the front facing leg slightly too long and when the glue sets trim them all level relative to the front with a router.
Click the image to open in full size.[/IMG]

I cut a notch stating about 20mm up from the bottom back point to fit a pair of binding posts the cable is silicon sealed up to the driver. The BAF stuffing is neatly arranged before the front is glued. Finish to taste. What colour have I painted them? Wait and see!
Chris
  Reply With Quote
Old 17th July 2007, 10:15 AM   #2
Colin is offline Colin  United Kingdom
diyAudio Member
 
Join Date: Aug 2003
I like the neat bracing arrangement.

Look forward to seeing pics of the finished cabinet. I know from experience the triangle isn't the easiest of builds and one day I intend to rebuild mine to get a better finished result. I went for thin strips along the corners to hold everything together (three sides inside but looks six out). It sort-of-worked but hand-planing them didn't. I've since discovered the wonders of power sanders ...

Still sound good though.
  Reply With Quote
Old 17th July 2007, 12:39 PM   #3
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Default Re: GM JX92S MLTL-48 Triangle (JIT for UK Meet)

Quote:
Originally posted by Mr Chris
What colour have I painted them? Wait and see!
You tease, you...

They're looking good to me so far.
__________________
Community site www.frugal-horn.com Commercial site www.wodendesign.com
  Reply With Quote
Old 17th July 2007, 01:56 PM   #4
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
I love those little braces, they look almost hand carved.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 30th July 2007, 11:46 PM   #5
jkeny is offline jkeny  Ireland
Banned
 
Join Date: Feb 2007
Location: Dublin
Hey Chris,
This box got universal praise at the DIY meet - well done.

Can you give some more measurements for the panel sizes, etc for construction - I have 2 JX92S drivers just waiting for a good box to house them. Like you I have too many projects on too many burners & life keeps getting in the way of finishing them. Sounds like a good excuse doesn't it but maybe I'm just lazy, who knows?

John
  Reply With Quote
Old 30th July 2007, 11:54 PM   #6
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
BTW, they were painted desert khaki-ish.

That gives me an idea - we should send them to the Gulf, and let everyone on all sides listen to them. They would do much more for world peace than any amount of tanks and planes.

I can just picture it now, an insurgent planting a bomb stops, listens, and becomes completely distracted by how such a little driver can sound so good!
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 31st July 2007, 12:41 AM   #7
jkeny is offline jkeny  Ireland
Banned
 
Join Date: Feb 2007
Location: Dublin
Is anybody in a position to compare them to the standarad 48" box?

Edit: RandyB for instance was at the meet, I think, and has a number of JX92S boxes?
  Reply With Quote
Old 31st July 2007, 07:28 AM   #8
diyAudio Member
 
Join Date: Feb 2007
Location: Leeds
Here's a photo of the first listen in progress...

Click the image to open in full size.
  Reply With Quote
Old 31st July 2007, 08:57 AM   #9
diyAudio Member
 
vitalstates's Avatar
 
Join Date: Jan 2006
Location: uk
They sounded awesome on Saturday Chris. I was really impressed how they made use of the corner, it really sounded like the bottom end was rock solid.

Ed
  Reply With Quote
Old 31st July 2007, 01:57 PM   #10
BWRX is offline BWRX  United States
diyAudio Moderator Emeritus
 
Join Date: Jan 2005
Location: Pennsylvania
Nice job on those 60 degree cuts. Those aren't easy! Excellent finish on the enclosure too
__________________
Brian
  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
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
Veneering the JX92S GM MLTL LizardBrain Full Range 10 5th April 2006 09:31 PM


New To Site? Need Help?

All times are GMT. The time now is 01:27 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