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Old 18th December 2018, 02:52 AM   #1
jdrouin is offline jdrouin  United States
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Join Date: Feb 2012
Location: Tulsa, OK
Default mFonken103SolT Build

I've begun to build a pair of mFonken103SolT -- the trapezoidal fonken enclosure for FF105WK but for the FE103Sol, using the alternate vent spacing included at the end of the FF105WK fonken planset. I might ask for some pointers on construction, but at the very least I figured this thread might be useful for other relatively novice builders who want to try one of the trapezoidal designs.

There is enough material left over to make a pair of Classic Golden Ratio enclosures, which I'll be doing at the same time (will post in the pic thread when done). These will be my third and fourth speaker builds, following a pair of Woden Shrike and Falcon, which are really good.

Material is 15mm Baltic birch, along with three 9mm boards of red oak and Brazilian cherry for the vent spacers. The different colors will make for an interesting pattern on the baffle, though I might end up veneering these. We'll see.

All panels were cut to rectangles today, with the width slightly wider to allow for margin of error when making the bevel cuts (will figure out how to do it on scrap first). The cut list in the plans made this really easy!

The plans call for 1/2" UltraTouch denim insulation, which doesn't seem to be available anymore, so I could use suggestions on good alternatives.

There's the 1/2" acoustic damping foam at Parts-Express:

Sonic Barrier 1/2" Acoustic Sound Damping Foam with PSA 18" x 24"

As well is this wool batting with a 1/4" loft. Perhaps it would work by doubling it up.

Amazon.com: Pellon W-72 Twin Size Wool Batting, 72" by 96", White: Arts, Crafts & Sewing

Any recommendations? What works for you?
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Last edited by jdrouin; 18th December 2018 at 02:54 AM.
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Old 18th December 2018, 04:48 AM   #2
pcgab is offline pcgab  United States
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Join Date: Dec 2014
Location: San Marcos, Texas
mFonken103SolT Build
Amazon.com: Buying Choices: 16 in. x 48 in. Denim Insulation Multi-Purpose Roll (6-Pack)

I order it from amazon. Nice stuff, seems to work very well.
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Old 23rd March 2019, 09:39 PM   #3
jdrouin is offline jdrouin  United States
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Join Date: Feb 2012
Location: Tulsa, OK
Thanks for that, pcgab, and sorry for the late response. I recently completed a pair of CGRs and ended up using wool batting with a 1/4" loft, and then doubling it up. It works very well.

It's strange to be taking up a loudspeaker project right after finishing the CGRs (which are superb, btw), but they've made me want to hear the trapezoidal mFonkens.

I started with the exterior side panels and vent spacers, cutting them to lengths that will turn out correct when I cut the big 45* chamfer later.

The spacers are 9mm (3/8" oak and Brazilian cherry from Woodcraft. Some of the oak is a hair thicker than the other material, so I might need to sand or plane it, or else insert paper shims where it seems there might be an unclosable gap with the interior wall.

Also, I had to make some spacers from two cuts of hardwood in order not to have to buy more material

Next I'll make the front baffle, rear baffle, and braces. I cut the brace panels 1/2" larger for inserting into dados for maximum strength and rigidity.
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Old Yesterday, 09:37 PM   #4
pcgab is offline pcgab  United States
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Join Date: Dec 2014
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mFonken103SolT Build
Funny, I built a pair of CGRs for a friend recently. He's using alpair 10p, iirc.

They do sound great, he's enjoying them quite a bit.

Excited to see you build the trapezoidal cabinets, should be fun!
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Old Today, 01:11 AM   #5
jdrouin is offline jdrouin  United States
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Yes, you and I had a lengthy conversation about sanding and oiling in that thread. ;-)
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Old Today, 11:59 AM   #6
pcgab is offline pcgab  United States
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Join Date: Dec 2014
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mFonken103SolT Build
Quote:
Originally Posted by jdrouin View Post
Yes, you and I had a lengthy conversation about sanding and oiling in that thread. ;-)
Ha, yeah we did!
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