Diffusion inside Pensil Box? Other ideas for bracing... - diyAudio
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Old 26th January 2013, 12:54 AM   #1
diyAudio Member
Join Date: May 2005
Location: Spokane, WA
Default Diffusion inside Pensil Box? Other ideas for bracing...

Hello All,

Thinking about building a set of Alpair 12's for my girlfriend in a Super Pensil box and was curious if there are any advantages in the following ideas being implemented into the boxes.

1: instead of using bracing on 90 angles, just move the braces off center and cut at a 15 or so degree angle. Still use plenty of holes etc. and tighten everything up. Seems like this would solve some of the problems of directly opposing walls.

2: instead of idea 1 above with use some sort of diffusion inside the box to smooth out response. Perhaps instead of running mdf with swiss cheese as bracing just run lots of dowels of different dimensions.

Any thoughts?

Another idea that I had was to mount some diy set amps on the back of the box so they're more like monitors.

Love Mark's stuff, I can't wait to do a build.

My other gear is Decware and Linkwitz so I'm pretty spoiled.

Thanks guys, great forum!
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Old 26th January 2013, 06:35 AM   #2
zman01 is offline zman01  Bangladesh
diyAudio Member
Join Date: Feb 2011
Location: Dhaka

You mean for the Alpair 12P right? The old metal Alpair 12 is out of stock for North American dealers and Mark Audio is not producing that as of now.

As long as you don't have equal sections created by your angled brace, it should be ok - but not sure this method will yield major benefits. And you will need some stuffing too - so a removable back pannel is advised. Also instead of MDF, multi-layer plywood is recommended by most builders (MDF dust issues, ply is stiffer and lighter).

And I would suggest the standard Pensil 12 instead of the super because that is designed to have a flatter response, but YMMV.

Last edited by zman01; 26th January 2013 at 06:43 AM.
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Old 26th January 2013, 08:09 PM   #3
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Join Date: May 2005
Location: Spokane, WA
Yep, I mean the new Pensil. And yes, I would use MDF for the inside bracing but not the exterior. For that I typically go baltic birch.

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Old 26th January 2013, 08:16 PM   #4
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MDF makes poor braces.

community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
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