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Old 3rd December 2012, 01:09 AM   #311
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I have one bit of advice for this project:

Make sure you are happy with your choice of driver before you start.
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Old 3rd December 2012, 01:14 AM   #312
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Quote:
Originally Posted by planet10 View Post
. No foamboard.
Are you coming to the mainland before Christmas? I have 16 boards available at a great price.

Then you can hear your FF125 babies before you decide. Did Rich send you an email?
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Old 3rd December 2012, 01:15 AM   #313
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Originally Posted by planet10 View Post
I just checked the local dolllar store. No foamboard. Michael's (on theotherside of the grocery store has 20x30" for $5 a sheet, 2x for ones with flat colour or some patterns including glittery metallic.

Each sheet good for 4 4.5" wide 30" strips.

CAD program says the short sporals are 1585mm (62.4"), the long ones 2234mm (88") so total of 7.638m = 301"

9 strips for the short, 12 for the long, 6 sheets = $30, $10 more for a colour or patterned board in the exit area.

I'll continue to check other stores.

dave
Try Walmart. The $5 a sheet stuff has really thick paper and is a pain to cut with a razor actually - I think they put glass fibers in the foam and it doesn't cut cleanly.
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Old 3rd December 2012, 01:23 AM   #314
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Quote:
Originally Posted by Cal Weldon View Post
I have one bit of advice for this project:

Make sure you are happy with your choice of driver before you start.
Yes, use something you know from other projects so that when you listen to it for the first time, you know that it's the enclosure that is doing this - by 'this' I mean turn a driver you know and like into something almost unrecognizable from a take your breath away, love. My other recommendation is to get something with a definite high end that is strong. If you look at the TC9FD's SPL vs freq plot, it packs a wallop from 9k Hz on up, exceeding the nominal SPL rating by 5 to 7 dB and I think this helps to balance it in such a bass heavy enclosure.
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Old 3rd December 2012, 01:24 AM   #315
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the only foam board stock i found at dollarama was only an 1/8" thick and seemed to flimsy.i thought about laminating it but that kinda takes the ease of use factor out of the equation.
after a little experimenting with coroplast it does seem to have draw backs,for instance if you cut it parallel to the "ribs" it's almost impossible to bend (especially a small radius) but a perpendicular cut can be easily curled into a tight roll without alot of crinkling of the inner layer.
i may make an attempt with a thin plywood (front and back) and coroplast (cut the right way) for the inner spiral.
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Old 3rd December 2012, 01:31 AM   #316
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Originally Posted by turk 182 View Post
the only foam board stock i found at dollarama was only an 1/8" thick and seemed to flimsy.
There is close to equal pressure on either side if the 'flimsy' wall of the horns so don't worry about it. Be concerned about what the driver is mounted to. The Sure-Ply I used my might end up needing a Supra Baffle to help stiffen things up, but as is it's a heck of a start. This is an evolving project.
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Old 3rd December 2012, 01:43 AM   #317
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Originally Posted by xrk971 View Post
What 3 in driver did you use?
Those are custom, hand made driver from little known remote town, Werdifucowee in central Africa.
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Old 3rd December 2012, 02:31 AM   #318
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Quote:
Originally Posted by Cal Weldon View Post
Are you coming to the mainland before Christmas? I have 16 boards available at a great price.
No plans to travel to Canada before Christmas.

Happy 50th coming up i understand.

dave
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Old 3rd December 2012, 02:33 AM   #319
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Originally Posted by xrk971 View Post
Try Walmart. The $5 a sheet stuff has really thick paper and is a pain to cut with a razor actually - I think they put glass fibers in the foam and it doesn't cut cleanly.
I avoid Wally World whenever possible. Rith says we have a dollarama here.

dave
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Old 3rd December 2012, 04:00 AM   #320
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Seems to me that routing a template for use in a pin router would be expedient. Create complimentary channels in the front and back to receive the strips of foam core.

Also, why not go ahead and make an mtm using 2 Vifas and an economical tweeter? ...or 4 in a diamond mmtmm surrounding the tweeter? They are small enough that lobing shouldn't be an issue. There's no reason you full-rangers should have all the fun.


Last edited by Ed LaFontaine; 3rd December 2012 at 04:07 AM.
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