GM JX92S MLTL-48 Triangle (JIT for UK Meet)

Mr Chris · 17th July 2007, 08:55 AM

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:

[/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.

[/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

Colin · 17th July 2007, 10:15 AM

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.

Scottmoose · 17th July 2007, 12:39 PM

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.

pinkmouse · 17th July 2007, 01:56 PM

I love those little braces, they look almost hand carved.

jkeny · 30th July 2007, 11:46 PM

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

pinkmouse · 30th July 2007, 11:54 PM

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!

jkeny · 31st July 2007, 12:41 AM

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?

Mr Chris · 31st July 2007, 07:28 AM

Here's a photo of the first listen in progress...

vitalstates · 31st July 2007, 08:57 AM

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

BWRX · 31st July 2007, 01:57 PM

Nice job on those 60 degree cuts. Those aren't easy! Excellent finish on the enclosure too

17th July 2007, 08:55 AM	#1
Mr Chris diyAudio Member Join Date: Feb 2007 Location: Leeds	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: [/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. [/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

17th July 2007, 01:56 PM	#4
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	I love those little braces, they look almost hand carved. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

30th July 2007, 11:54 PM	#6
pinkmouse diyAudio Moderator 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! __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

31st July 2007, 01:57 PM	#10
BWRX 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

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17th July 2007, 10:15 AM	#2
Colin 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.

30th July 2007, 11:46 PM	#5
jkeny 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

31st July 2007, 12:41 AM	#7
jkeny 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?

31st July 2007, 07:28 AM	#8
Mr Chris diyAudio Member Join Date: Feb 2007 Location: Leeds	Here's a photo of the first listen in progress...

31st July 2007, 08:57 AM	#9
vitalstates diyAudio Member 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

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