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Old 21st December 2010, 08:24 PM   #1
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Default Alpair 7 - good baffle thickness?

Related to this discussion in the Dec 14, A10.2, A6p, A6m have hit Madisound thread;

What would you say is a good baffle thickness for the Alpair 7, incl. bezel cover? 18mm? 20mm? More? ... Would you consider 15mm too thin and difficult to work with?

I'm having some wood cut for a Frugel-Horn Mk3. Might as well bump up the baffle thickness I think. How far to go, then?

Thanks!
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Old 21st December 2010, 08:44 PM   #2
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assuming the alpair7 baffle is similar to my 12's they are almost 12mm inc gasket . assuming you're recessing your baffles 15mm doesn't leave much room for your screws to bite into let alone radius . minimum would be 18mm .

cheers , Woody
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Old 22nd December 2010, 12:43 AM   #3
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Here is a set of dimensions for the Mark Audio drivers (no Alpair 10.2 or 6.2 yet). i just revised the Alpair 7s to reflect a unit on hand.

Attached is the A7 (2nd production run with (grey) superGasket) mounted in 12, 15, 18mm baffles. 12 would really require supplemental support on the magnet, 15mm is probably fine (we use 18mm baffle with A12, which in the end has about the same "meat" (althou will magnet support) -- especially if the driver is backstopped with a holey brace, 18mm would be a 1st choice.

The above assume good multiply. MDF is not nearly as strong, so would need to be thicker. if you use aluminum, i'd rear mount them, with a 45 degree bevel on the opening.

dave
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Old 22nd December 2010, 03:54 PM   #4
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FWIW, if you're going down the MDF route (not recommended, but it's better than being tortured, thrown down a fire escape, and being danced on by gibbons) then you'll need 1 1/8in panel thickness to ~equal 3/4in of baltic birch or an equivalent thereof.
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Old 22nd December 2010, 04:12 PM   #5
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Quote:
Originally Posted by Scottmoose View Post
FWIW, if you're going down the MDF route (not recommended, but it's better than being tortured, thrown down a fire escape, and being danced on by gibbons) then you'll need 1 1/8in panel thickness to ~equal 3/4in of baltic birch or an equivalent thereof.

Scott, don't disparage being danced on by hairy apes - one of my fonder memories from high school grad (1969 - yes, really Grad '69 , but only in my hormone soaked dreams that night)

For those using BB, Apple or any of the HD plywood types, 1" thickness is available, but due to reduced demand is substantially higher cost. OTOH, If you're planning on a lot of speaker projects, a single sheet would produce a lot of pairs of driver baffles.

But absent that, I've been laminating a small plate or ring of 9mm ply on the rear side of driver cut-out of normally 15 or 18mm baffles. Even with the wider than normal bezel/flanges on Mark's drivers, the location of the screw mounting holes doesn't leave a lot of core material if you chamfer the inside and rebate for flush mounting. Regardless of your philosophy on sound of the materials, this is where MDF or particle board or low density plywood "pro-core" sheet goods show their true colours.

As Dave notes, driver / magnet brace probably never hurts .
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Old 22nd December 2010, 05:09 PM   #6
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What fine information - thank you all.

And as it turns out ... *pulls a long sheet of wood from under his desk and shows it to the camera* I have some extra 9mm ply that I've been wondering what I should do with!
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Old 23rd December 2010, 10:07 AM   #7
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Quote:
Originally Posted by Scottmoose View Post
FWIW, if you're going down the MDF route (not recommended, but it's better than being tortured, thrown down a fire escape, and being danced on by gibbons) then you'll need 1 1/8in panel thickness to ~equal 3/4in of baltic birch or an equivalent thereof.
Hi Scott,
I'm waiting at Melbourne airport. Should get back to HK tonight/tomorrow (fingers crossed). Wrong kind of snow at Heathrow so many long haul planes in wrong place. My flight is the first leg of the Melbourne - London rout.

So........love the "gibbon" reference......ummmmmph. Well applies to the world of Airport management at Heathrow and some of central EU!

Glad to see U back on DIYaudio.

Merry Christmas

Mark.
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Old 23rd December 2010, 02:08 PM   #8
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Hope your flight runs OK Mark; if I don't get change to speak to you before, then all the best for Christmas.

Upper management. Most of the gibbering fiends are only interested in lining their pockets. Running an airport properly doesn't come into it. The government's no better. I'd rather the nation was run by Monty Python's Flying Circus.

(just as a clairifcation to my last post, the thicknesses I quoted above are from the average MOE specs.; the MDF will be rather denser of course, which still makes it inferior).
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