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Old 11th November 2012, 01:29 AM   #1
tezza10 is offline tezza10  New Zealand
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Default Open baffle

Anyone see any issues with using a 10mm thick steel plate for the baffle plate (laser cut for drivers and pressed for side wings and base plate). Also just how much low end can I expect from 2 x 15" woofers each side (fs=47, Qts=0.55, Xmax= 4.1, Vd=3505, Sensitivity claimed 97dB)?
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Old 11th November 2012, 01:35 AM   #2
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I think, at 10mm, it is still going to ring like hell.

Ever knock on a military tank?

I know my 4 X 15" drivers will hit with authority.

Click the image to open in full size.

The bases are 2.5" thick.

Blair
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Old 11th November 2012, 02:26 AM   #3
tezza10 is offline tezza10  New Zealand
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Very nice! Are they solid timber baffle? And good point about the tank. I was just trying to get a bit creative seeing as I have access to a fabrication shop.
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Old 11th November 2012, 02:28 AM   #4
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The bass panels are cabinet grade ply. The tops are solid mahogany.

I think the steel would be awesome, but you need to sandwich it with a deadening layer in the middle of two 10mm pieces.

Blair
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Old 11th November 2012, 03:12 AM   #5
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Quote:
Originally Posted by tezza10 View Post
Very nice! Are they solid timber baffle? And good point about the tank. I was just trying to get a bit creative seeing as I have access to a fabrication shop.
Well, if you've got access to the stuff, then do it. Just make sure to brace the back side AND use a liberal amount of Dynamat or other similar material.
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Old 11th November 2012, 03:26 AM   #6
tezza10 is offline tezza10  New Zealand
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Would filling the gap (between the two layers of steel) with sand provide the damping needed?
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Old 11th November 2012, 03:29 AM   #7
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Peanut butter works best.
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Old 11th November 2012, 04:02 AM   #8
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I would use Masonite or something similar layered to get the speaker driver gasket thickness. Sandwich the speaker between the steel plates.
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Old 11th November 2012, 04:12 AM   #9
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My long standing plan was to use sand filled panels like what G.A. Briggs did a very long time ago.
I haven't yet completed testing my prototypes which use farily thin MDF. If everything goes according to plan , the final version will be with sand filled baffles. These can be a pain to make. I have experience making many sand filled baffles and stands in the past.
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Old 11th November 2012, 05:46 AM   #10
tezza10 is offline tezza10  New Zealand
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Originally Posted by Melo theory View Post
Peanut butter works best.
It would be eaten faster than I could fill the baffle plates !
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