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Old 2nd June 2009, 03:00 AM   #1
Coyote is offline Coyote  Canada
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Default Cabinets

I am thinking of building octogonal cabinets using the Jordan 92s or fostex full range.
rear loaded cabinet type or maybe TL.
I do not have much experience so I am seeking advice regarding octogonal cab style.
acoustically it seems to make sense but I have seen very very cab built that way.
Why???
Or am I going the wrong direction and should just build a Jordan type of cabinet?

http://www.ejjordan.co.uk/systems/jx92_system.html

thx
a.
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Old 2nd June 2009, 07:32 AM   #2
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Hexagon Pioneer B20FU20 Enclosure

The more sides you have, the closer you approach a cylinder. This shape is condusive to an ML-TL.

dave
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Old 2nd June 2009, 05:30 PM   #3
Coyote is offline Coyote  Canada
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Default dave...

Hey Dave,

Thank you for the link what a great cabinet John built! very nice!!!

BTW your posts are always full of information and insight. I often stay late pondering this and that after reading the threads on diyAudio
:-)
Cheers,
a.
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Old 2nd June 2009, 06:54 PM   #4
CSS/XBL is offline CSS/XBL  Canada
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Odd numbered sides help avoid parallel walls and some think that's good. I did that back in the early 80s with the original Jordan 50mm units, 4 per side.

Bob
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Old 2nd June 2009, 09:38 PM   #5
chrisb is offline chrisb  Canada
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Quote:
Originally posted by CSS/XBL
Odd numbered sides help avoid parallel walls and some think that's good. I did that back in the early 80s with the original Jordan 50mm units, 4 per side.

Bob

no doubt, but beyond 5 sides, the math for calculating miter angles and dry fitting gets a bit trickier and time consuming
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Old 2nd June 2009, 10:01 PM   #6
CSS/XBL is offline CSS/XBL  Canada
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True, but some software like BassBox 6 does the math for you.

Bob
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Old 2nd June 2009, 10:07 PM   #7
Coyote is offline Coyote  Canada
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Default Octogonal cab

Actually here is where my inspiration come from;
Someone I just 'met' over the internet created some cab with the help of MJKing TL calculation table...beautiful cab, in 2008, and he was kind enough to send me some pic of them.

I am thinking of using the Jordan JX92S and recalculate the cab size (he used Pioneer Model A11EC80-02F). Actually I have no idea how to calculate that at this time but I also think of making some mod to the original idea.
Maybe using a baffle instead of open top etc.

I have sent an email to the creator requesting permission to post some of the pic he sent me, I will update this tread accordingly.

In the mean time if anyone want to comments on the JX92 choice please feel free! I first thought of using the EJJordan TL plan but then read somewhere that they might not be the best enclosure, any thoughts on that?

Cheers,
a.

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Old 2nd June 2009, 10:18 PM   #8
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Quote:
Originally posted by chrisb

the math for calculating miter angles and dry fitting gets a bit trickier and time consuming

4 sides: 180/4 = 45*
5 sides: 180/5 = 36*
6 sides: 180/6 = 30*
8 sides: 180/8 = 22.5*
9 sides: 180/9 = 20*
10 sides: 180/10 = 18*
12 sides: 180/12 = 15*
15 sides: 180/15 = 12*
etc.

Increase accuracy of these angle cuts but doing one cut up and the next down with the fence on the other side of the blade.
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Old 2nd June 2009, 10:41 PM   #9
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Default Re: Octogonal cab

Quote:
Originally posted by Coyote
I am thinking of using the Jordan JX92S and recalculate the cab size
Take either of the 2 GM ML-TLs off the Jordan site, or Jim Griffin's ML-TL ... and if we are going there, there has been some argument (mostly by me) that an Alpair 10 might be a better drop in for the JX92 than the current production JX92, but if you are going there, then Jim Griffin's A10 ML-TL might be a better starting point.

ML-TLs tend to be very tolerent of driver parms thou, so whichever way you go will likely work out fine.

dave
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Old 2nd June 2009, 10:41 PM   #10
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Default octognal cabinets

Scroll down a few to see my eight-siders. Pioneer Model A11EC80-02F Driver in a TL

http://www.quarter-wave.com/Gallery/Gallery.html

I used the tape and glue method (no clamps) and the joints are perfect.
BTW I used Martin King's alignment tables as the starting and ending points for my design.

Hilly-wa
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