Alpair 7 - Twin driver studio monitor plan - Page 3 - diyAudio
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Old 29th June 2010, 08:51 AM   #21
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And the damping. Please don't forget the damping.
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Old 29th June 2010, 09:31 AM   #22
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The plans in post 14 have been updated. Some glitches fixed and cleats added so that the back can be removed.

pdf version of plans

And a bit bigger visualization

Click the image to open in full size.

dave
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Old 29th June 2010, 09:50 AM   #23
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Quote:
Originally Posted by Musik007 View Post
My sample was already done by the maker. The rear panel is fixed and can not make it removable. Is there any technique to put damping material into the lower chamber and make it attach onto the rear wall?
Short of routing the back off and replacing it, it will be difficult to get the damping in the bottom chamber up to specification, but given that it has a 1" tall slot full width, you should be able to coax a full width piece of 1/2" wool or cotton felt thru the port and up the back side which will help at least a bit.

dave
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Old 29th June 2010, 12:20 PM   #24
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Mark...

Is it possible to do the same design with alpair 12's?
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Old 29th June 2010, 02:09 PM   #25
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Quote:
Originally Posted by aptquark View Post
Mark...
Is it possible to do the same design with alpair 12's?
That's a question best answered by Scott.
Thx
Mark.
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Old 29th June 2010, 03:35 PM   #26
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Hi dave,

Thanks for your suggestion.

Tony.

Quote:
Originally Posted by planet10 View Post
Short of routing the back off and replacing it, it will be difficult to get the damping in the bottom chamber up to specification, but given that it has a 1" tall slot full width, you should be able to coax a full width piece of 1/2" wool or cotton felt thru the port and up the back side which will help at least a bit.

dave
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Old 30th June 2010, 12:16 AM   #27
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dual alpair 12's ?

sure, but the sweet spot height will be tiny at 10-12'.

You can do it, you may not like the results, but the strengths may outweigh the minus in your opinion.

For me making dual 4" (57cm2 each) was not a mistake and I'd recommend it. I have exactly 9 pennies under the front edge. I'll let you know if I should have got a 6.5" instead of dual 4" after I've had my alpair 12 for a while.

Off the top of my head, an mtm design sounds like sound is coming at me from a tunnel (lack of ceiling bounce at some frequencies). A single driver should not have this effect.

Norman
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Old 30th June 2010, 03:25 AM   #28
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Quote:
Originally Posted by Musik007 View Post
Hi dave,
Thanks for your suggestion.
Tony.
Hi Tony,
Remember we got your cabinet guy to make an access panel in the back of a box last year. Since the boxes are still at the factory, ask him to make an access panel - see pic.

I suggest making the internal section of the panel around 110-mm high X 120-mm wide. This should be big enough for access. Also the outer section is bigger so can be sealed and screwed.

Thanks

Mark.
Attached Images
File Type: jpg access_panel.jpg (67.3 KB, 546 views)

Last edited by markaudio; 30th June 2010 at 03:26 AM. Reason: additional info
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Old 30th June 2010, 04:10 AM   #29
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Hi Mark,

Just called the cabinet maker. The cabinets were already built and all panels were assembled. So can not make an additional access panel on the cabinet as this is not work on milling machine. Can make it or make removable rear panel on next lot.

Thanks,
Tony.
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Old 30th June 2010, 07:33 AM   #30
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Quote:
Originally Posted by Musik007 View Post
Hi Mark,
Just called the cabinet maker. The cabinets were already built and all panels were assembled. So can not make an additional access panel on the cabinet as this is not work on milling machine. Can make it or make removable rear panel on next lot.
Thanks,
Tony.
Hi Tony,
Bet they have a jig saw somewhere in their workshop. Still, such is life.
Re a new set of cabs, ask them to follow Dave's latest drawing. That means the whole rear panel is removable, similar to the Pencil's they made last year.

Thx
Mark

Last edited by markaudio; 30th June 2010 at 07:34 AM. Reason: typo mending
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