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Old 26th March 2006, 12:37 PM   #1
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Default Opinion on laminating front baffle

i'm laminating a 1" followed by a 0.75" as my front baffle for dual 8" driver.

i remember reading couple of speaker designs that having the second one a bit larger in diameter to allow more air movement.

so wat i did was, the 1" has roughly 7.5" diameter while the 0.75" has 8.5" diameter.

after doing it, the second piece (0.75") look weird. i found the diameter to be a bit too big.

i'm wondering if it defeats the purpose of laminating it. The driver now is basically screwed on the 1".

any disadvantage ? any advise ?
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Old 26th March 2006, 12:58 PM   #2
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Consider using 1" thick marine plywood for the front baffle.

Some of the laminated front baffles leave a few deep "tabs" on the rear baffle for strength beams, and then route the rest of the rear baffle board on an angle to help air flow.


MARINE PLYWOOD
Technical Data

Moisture, % by Mass 5.1

Glue adhesion in dry state
a) Glue shear strength
i. Average, N 2520
ii. Minimum, N 1121
b) Adhesion of plies (by knife test) Passes the Test
Water resistant test (for 72 hours in boiling water)
a) Glue shear strength
i. Average, N 1980
ii. Minimum, N 882
b) Adhesion of plies Passes the Test
Tensile strength, kg/cm2
a) Parallel to grain direction 425
b) Perpendicular to grain direction 282
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Old 26th March 2006, 01:06 PM   #3
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fyi, i'm using both MDF

and no router

and the worst thing, i already cut those holes
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Old 26th March 2006, 01:59 PM   #4
Paul W is offline Paul W  United States
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...more marine materials. You could fill the angle between the different diameter holes with a mixture of epoxy and microballons. (The end result being a very strong angled chamfer.)

Automotive body filler would be stiff enough, but don't know if it would adhere well enough. I simply haven't tried it...but probably okay.
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Old 26th March 2006, 06:02 PM   #5
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Default Re: Opinion on laminating front baffle

Quote:
Originally posted by InfinityPWS
i'm wondering if it defeats the purpose of laminating it. The driver now is basically screwed on the 1".
No

Quote:
any disadvantage ?
not really

Quote:
any advise ?
just to make it look pretty to you.
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Old 26th March 2006, 10:09 PM   #6
amp_guy is offline amp_guy  United States
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Default bondo on wood

Quote:
Originally posted by Paul W
[
Automotive body filler would be stiff enough, but don't know if it would adhere well enough. I simply haven't tried it...but probably okay. [/B]

I have used auto body filler (aka bondo) many times on wood and wood products , it bonds with a vengance!
just be sure the surface is dust free before application
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Old 26th March 2006, 10:30 PM   #7
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Turn the baffle around, so the larger diameter hole is on the inside where it probably should have been from the start. With the driver mounted from the front, it's the inside where wave flow from the cone becomes more restricted especially with a thick baffle.
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