FAST Build: Alpair 7.3 - Seas L26ROY

Swifty · 17th October 2011, 10:24 AM

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...

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

Quote:

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!

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.

17th October 2011, 10:24 AM	#1
Swifty diyAudio Member Join Date: Jun 2004 Location: Holland	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:

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17th October 2011, 10:36 AM	#2
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	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?

17th October 2011, 11:14 AM	#3
Swifty diyAudio Member Join Date: Jun 2004 Location: Holland	Thanks Buzz! Did I ever mention wanting to go for an OB arrangement? I don't think so...

17th October 2011, 11:17 AM	#4
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	I thought I remember you had them in OB setup, oh well, too many threads in my head.

17th October 2011, 01:04 PM	#6
tuxedocivic diyAudio Member Join Date: Jan 2011 Location: Victoria, BC	This looks awesome! Very keen to follow this

14th March 2012, 04:07 PM	#7
Swifty diyAudio Member Join Date: Jun 2004 Location: Holland	Winter has ended, weather is improving, so onward with the build! 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!

14th March 2012, 10:30 PM	#8
malibujeff diyAudio Member Join Date: Mar 2010 Location: Georgia	Really cool.

15th March 2012, 06:54 AM	#9
Andy17 diyAudio Member Join Date: Feb 2012	Looks really great

15th March 2012, 07:58 AM	#10
zman01 diyAudio Member Join Date: Feb 2011 Location: Dhaka	Yup looking great. Boenicke-audio inspired shell? Look forward to your listening impressions.

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