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Multi-Way Conventional loudspeakers with crossovers

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Old 13th October 2012, 02:25 PM   #1
ODougbo is offline ODougbo  United States
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Thumbs up SAND LINER - DIY

I've done this a few times; it seems to work well and meets all my criteria:

* Easy

* Low cost

* Could take extra time

Recipe: Simple - pick up Spray 77 at Home Depot, tape edges, spray and add sand. Let each application dry 12 hours.

This pic has 4 "coats"

Be careful with the glue, it's got a real kick to it
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Last edited by ODougbo; 13th October 2012 at 02:30 PM.
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Old 13th October 2012, 05:14 PM   #2
sippy is offline sippy  United Kingdom
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Do you multi-layer the glue / sand?
Most of the best glues are
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Old 13th October 2012, 05:36 PM   #3
tvrgeek is offline tvrgeek  United States
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So, this lowers both the panel resonance frequency and the Q.
I would hope a topcoat to seal the sand in, as I would not want it shaking loose and a grain inside my woofer gap. Couple coats of thick latex house paint maybe.

I offer that proper bracing and fill will do better. The only way to tell is two boxes and test.
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Old 13th October 2012, 06:16 PM   #4
ODougbo is offline ODougbo  United States
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Yes on multi-layer; this takes 3 - 4 days (5 mins morning/night)

Yes on top coat(s), going to use clear poly.

I do have similar mdf cabinets (left pic) and have done some testing..the sand wall boxes (right pic) are way better. If fact, going to pull the speakers out of the black boxes and move to new sand wall boxes.

The boxes on the right sound great (sand walls), one of my best projects - that's why building more.
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Old 14th October 2012, 03:12 AM   #5
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I have a friend who does this with plaster of Paris, he mixes it with shredded paper and Bondcrete and coats all the walls to a thickness of about 10mm
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Old 14th October 2012, 03:15 AM   #6
Pano is offline Pano  United States
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I've used bituminous paint mixed with a heavy dose of sand. Seems to work well. The paint is actually water based, so won't get you high, but it does clean up easily.
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Old 14th October 2012, 04:56 AM   #7
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Quote:
Originally Posted by Pano View Post
I've used bituminous paint mixed with a heavy dose of sand. Seems to work well. The paint is actually water based, so won't get you high, but it does clean up easily.
What kind of paint, Pano? I've got some horns I just built that could use some more damping. This sand and spray adhesive method looks good too.
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Old 14th October 2012, 11:56 AM   #8
ODougbo is offline ODougbo  United States
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Default Quick and Easy

I thought some might like this ploy:

For the port I picked up a 12" drain extension at HD ($2.50) in the plumbing section.

This PCV tube is 1-1/2" OD, all I needed for the hole was a standard 1 -1/2" flat spade bit. It was a good fit; used hot glue to glue it in.

For the next project, might use the flare end of the PVC (which would need a bigger hole)
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Old 14th October 2012, 03:06 PM   #9
Pano is offline Pano  United States
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Quote:
Originally Posted by natehansen66 View Post
What kind of paint, Pano?
It's a tar paint (bitumen). Black and thick. I was surprised to see it in water base. I think it came from the roofing aisle of a big box hardware store.

Doug's glue and sand should be similar, if not even better. His sand application looks thicker than mine.
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Old 14th October 2012, 03:15 PM   #10
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Quote:
Originally Posted by Pano View Post
I've used bituminous paint mixed with a heavy dose of sand. Seems to work well. The paint is actually water based, so won't get you high, but it does clean up easily.
Please don't use the solvent based adhesive! How do I know? Don't ask.
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