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In the Forum: Horn-Loaded Speakers
In the Thread: The Ridiculous Japa-Brazilian horn.

Post Subject: Damping with VB-1XPosted by jessie.dazzle on: 4/27/2009

http://www.cascadeaudio.com/marine/vb_1x_damping_compound.htm

After reading the tech notes on VB-1X, I have difficulty with the manufacturer's claim that the product is effective at damping frequencies down to 10Hz, when at the same time they specify a coating that measures only "1/32 - 1/16 inch" in depth...

This product seems to be conceived mostly for automotive use. In this context (sheet metal panels), I would say that as much of the benefit comes from the added mass to the panel, as from the product's capacity for "converting vibration into viscous friction" (potential quote of the week there).

Composition-wise, no details are given as to the liquid component, but as it cleans up with water, I would guess it to be a thickened latex (sort of like thick latex house paint). As for solids, "silica-mica ceramics"; I will say only that silica is the primary component of common sand.

Along the same lines, you may want to check out 3M "Body Schutz" and other paintable rubberized coatings : http://www.autobodytoolmart.com/c-577-undercoatings.aspx
Also available in aerosol cans that work very well.

Unless building up an abnormally thick coat, none of the above will be as effective as the previously-mentioned 1/4" thick, semi-cured rubber product from Spain, however, it is important to note that this stuff is not paintable, and is the color of peanut butter.

jd*

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