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Swifty 17th October 2011 10:24 AM

FAST Build: Alpair 7.3 - Seas L26ROY
After the proof of concept monkey coffins I poster earlier, I finally started building the cabinets for my FAST project. I will be using the "Translam" method, mainly due to my limited access to nice tools like a table saw (or even a shed for that matter) All I have is a router, jigsaw and a workmate.

The sides will be made from 24mm baltic birch ply and will function as the L26ROY's baffle. The middle 9 slices are water proof MDF. Bracing will be extensive. to get the resonating frequency above 200hz as much as possible. (200 hz will be the crossover point between the two drivers)

The Alpair 7.3 will be housed in a separate chamber, designed to minimiste standing waves. This chamber will be made heavy and thick by adding car audio deadening mats to keep it's resonating frequency below 200 hz as much as possible. Here are a few pics of the progress so far:

buzzforb 17th October 2011 10:36 AM

I am inspired. Keep up the good work. I have been looking at how to do a teardrop for the 7.3. Just seems like a cool idea and there is another fellow doing it with a Fostex. I will try combining the 7's with a T-TQWT for my CA 22RNX. Bjorno simmed one for me and it looks usable up to 150-200Hz. May I ask why you dropped the OB concept?

Swifty 17th October 2011 11:14 AM

Thanks Buzz!

Did I ever mention wanting to go for an OB arrangement? I don't think so...:confused:

buzzforb 17th October 2011 11:17 AM

I thought I remember you had them in OB setup, oh well, too many threads in my head.

silverhairbp 17th October 2011 12:56 PM


Originally Posted by buzzforb (
I thought I remember you had them in OB setup, oh well, too many threads in my head.

Goto uses an OB.

tuxedocivic 17th October 2011 01:04 PM

This looks awesome! Very keen to follow this :)

Swifty 14th March 2012 04:07 PM

Winter has ended, weather is improving, so onward with the build!:D

For the cabinets I am using a combination of waterproof MDF and Birch Ply. The Birch will be used for both side panels and MDF for the rest. The MDF part will be haevily reinforced and stiffened by birch ply supports as shown in the picture. Furthermore I will cross brace all panels extensively with broom handle sticks. Pics of that will follow.

The first cabinet is ready for the final sanding/filling/finishing! Yay!

malibujeff 14th March 2012 10:30 PM

Really cool.

Andy17 15th March 2012 06:54 AM

Looks really great

zman01 15th March 2012 07:58 AM

Yup looking great.

Boenicke-audio inspired shell?

Look forward to your listening impressions.

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