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Old 2nd June 2009, 09:43 PM   #11
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Default Re: octognal cabinets

Quote:
Originally posted by Hilly-wa
my eight-siders. Pioneer Model A11EC80-02F Driver in a TL
Click the image to open in full size.

Those sure are pretty

dave
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Old 2nd June 2009, 09:53 PM   #12
Coyote is offline Coyote  Canada
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Default ...

Ok,

I just fell off my chair,
Dave
The pic you have provided for the octogone is one of the pic that this guy sent me earlier this week (or so)! Maybe he is a member here too???
I saw this pic from another site (i Think) and emailed him for more information!
They sure are nice.


a.
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Old 2nd June 2009, 09:59 PM   #13
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Default Re: ...

Quote:
Originally posted by Coyote
The pic you have provided for the octogone is one of the pic that this guy sent me earlier this week (or so)! Maybe he is a member here too???
His is post #10 in this thread.

dave
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Old 2nd June 2009, 10:29 PM   #14
Coyote is offline Coyote  Canada
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Default ...

you're rightost 10.
I think it is the same person.
we'll see!
Cheers,
a.
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Old 3rd June 2009, 02:36 AM   #15
chrisb is offline chrisb  Canada
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Quote:
Originally posted by MJL21193



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.

Well yes, calculating the angles and even cutting all the pieces at the same setting is one thing, but getting them exactly right for seamless structural joints can be a challenge the first couple of times.

Also, my earlier post wasn't clear, but I was really responding to Bob's comment re odd number of sides. Above 5, I imagine it would get more than a bit time consuming to accurately set the saw for the calculated angles, and fit the parts for tight joints

7 sides = 25.71*
11 sides = 16.36*
13 sides = 13.46*

etc.

Of course this is all just bloviation on my part, as I've never been inspired or commissioned to try anything more elaborate than a six sided box

Click the image to open in full size.


the 1" MDF carcasses for these were not just folded and masking-taped together
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Old 3rd June 2009, 03:14 AM   #16
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Quote:
Originally posted by chrisb

...as I've never been inspired or commissioned to try anything more elaborate than a six sided box

You need to stretch your creative legs - the fun you are missing.
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Old 3rd June 2009, 04:39 PM   #17
chrisb is offline chrisb  Canada
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Quote:
Originally posted by MJL21193



You need to stretch your creative legs - the fun you are missing.


Oh, I had at least a decade's worth of fun with the Tannoy Churchill clones.
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Old 3rd June 2009, 05:26 PM   #18
Coyote is offline Coyote  Canada
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Default Jordan JX92s

Ok,
Well,

So lets pretend that,
with a Pioneer Model A11EC80-02F of 4.5inch
Using the alignment tables one comes up with SL = SO = 68.741 sq. inches, and a corrected length of 45.193 inches tall.
4 sides of 5-5/8 inches with 4 sides of 2-1/16 inches maps out to the correct SO, and we cut 22.5-degree cuts.
(not my numbers)
Switching to the Jordan at 5.5inch and if one would want to keep the cabinet at a Max of ...say 4ft (48inch = lenght of a sheet), how can I calculate the square inches required and how to calculate the size of the 16 boards (2x8boards) needed if I wanted to keep the same board size ratio as per the original Pioneer box?

I am a bit lost at the moment with all this

I am planning on using 5/8 high quality birch ply.

Cheers,
Thx you all.
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Old 3rd June 2009, 05:38 PM   #19
Coyote is offline Coyote  Canada
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Default Planet 10

Dave,

Thank you for the suggestion

"Take either of the 2 GM ML-TLs off the Jordan site, or Jim Griffin's ML-TL"

The EJJordan vtl transmission line is on my agenda to build at one point!
I am looking at reviews of this cabinet and other modified versions. Suggestions welcome on the Jordan VTL.

This could bring in the question of full range spkr, at 88db efficiency the JX92s might be a challenge to drive with a tube amp.



Alain
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Old 5th June 2009, 01:41 PM   #20
Coyote is offline Coyote  Canada
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Default Ok

First:
Yeahhhhh!
I received the authorization from the owner to share the pictures, etc.
He kindly sent to me those a few weeks ago.
I know I could have just post the pics but, better ask first.

Here they are.
The speaker as a flat panel
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