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Old 19th May 2010, 06:18 PM   #1
pjanda1 is offline pjanda1  United States
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Default BetsyK Simple TL

I've been talking about this box for a few months, and I finally completed some graphics. This is a folded TL/TQWT that I modeled in Horn Response. I have built a couple of pairs, and they sound great! They started as a project for my brother and sister-in-law who needed moderately sized enclosures. I like this box over vented boxes due to the intrinsic bracing and midbass gain. I have used them against a wall and in corners. You could make the terminus front facing, but I'd make it as pictured as long as you can get them an inch from the wall. Of course, you could also make them side facing.

I have them stuffed with a pound and a half of polyfill per box. I have it concentrated towards the top, and tapering down to stop just above the folds. The brace is arbitrary. You could leave it out, or you could do something more substantial. The drawing assumes 3/4" material. I used "Arauco" ply, which is an almost entirely void free pine that costs less than $25 a sheet.

This is my favorite reasonably sized box for the BetsyK's. I hope you'll ask questions and try them!

Paul
Wild Burro Audio Labs - DIY Full Range Speakers
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File Type: jpg BetsyK_TL.jpg (123.8 KB, 1594 views)
File Type: jpg BetsyK_TL_face.jpg (112.1 KB, 1521 views)
File Type: jpg BetsyK_TL_folddims.jpg (130.5 KB, 1500 views)

Last edited by pjanda1; 19th May 2010 at 06:22 PM. Reason: attachment troubles
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Old 20th May 2010, 01:34 AM   #2
pjanda1 is offline pjanda1  United States
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Oops! I was just pondering the drawing I posted, and it occurred to me that I screwed up badly. As you can see, the box doesn't have sides. That was intentional, and it is assumed that 3/4" sides cover the whole thing. However, the width of the cabinet with sides is 12"! I show the "guts" as being 12" wide, but they are really 10.5". A finished cabinet would be 12"w x 13d" x 44"h, not 13.5" wide as the drawing would seem to indicate.

Part of the design goal was to make very efficient use of both floor space and materials. So, you can get a pair of cabinets out of a sheet and a half of ply (many places sell half sheets). I get all the front, back and sides out of one piece. First, I cut two 44" pieces of the 8' length (allowing you to cut off the edges if they are damaged or not square). The, I cut each of those into two 10.5" (fronts and backs) and 13" (sides) panels. That allows you an extra inch for kerf (I use a thick plywood blade). So, you waste very, very little of the entire sheet and the grain goes up and down on your speaker. Then, I cut strips out of the other half panel for tops, bottoms and braces.

hope that makes sense,

Paul
Wild Burro Audio Labs - DIY Full Range Speakers
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Old 20th May 2010, 11:14 PM   #3
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Paul I have been waiting for something a bit smaller to come along. I think the next time I am at menards or one of the big box shops I will pick up arauco plywood.
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Old 21st May 2010, 06:03 AM   #4
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Vaguely what I had in mind. Probably won't stick religously to
the original 3rd K12 cab I was unsucessfully trying to sketch.
There are measurement discrepancies I've yet to resolve. I'm
just gonna wing it... In Styrofoam, of course...

Yes, I'm aware this cab is scale for 12, and BetsyK is an 8.
But we already know these two like each other, except for
the eyelet thing. Effect of foam is the only real gamble...
Aruco definately where I'd go next if the Foam don't cut it.
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Last edited by kenpeter; 21st May 2010 at 06:08 AM.
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Old 6th October 2010, 02:21 AM   #5
ejfud is offline ejfud  United States
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Anybody built one of these yet?

How's the bass response?
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Old 3rd June 2011, 01:02 AM   #6
tweakk is offline tweakk  United States
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Hey Paul,

I just got off the phone with a pro cabinet-maker and he's ordering the materials tomorrow and building a pair of your TLs for me.. 100% hardwood baltic-birch ply. I'll post pics when it's done.

:^)
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Old 3rd June 2011, 01:38 AM   #7
freddi is offline freddi  United States
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hi Kenpeter - did you catch the thread of the guy on the Karlson forum who landed a pair of the elusive "3rd K12"? - he loaded those with EV 12L - maybe you can get some dimensions - his are almost square at the bottom
Hello from a newbie - about to get my first set of karlsonettes
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Old 18th June 2011, 01:34 AM   #8
tweakk is offline tweakk  United States
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Finally!

My Simple TL with Founteck NEO 3.5H ribbon tweeters. 100% hardwood baltic-birch laminated with Wilson Art Xanadu.

Not hooked-up yet...
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Old 18th June 2011, 01:35 AM   #9
tweakk is offline tweakk  United States
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More...
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Old 18th June 2011, 01:05 PM   #10
ejfud is offline ejfud  United States
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Great build!
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