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Best way to decrease the internal volume of a sealed speaker?

I have a very fine sealed 0.75 cu foot cabinet that I would like to reduce the internal volume to about to about 0.45-0.65 cu feet. There is limited space to add things like bricks, pavers etc inside.
I am thinking of using some plastic containers with lids glued to the inside cabinet. Should they be filled with sand?

ozzy


ozzy

Showing 2 responses by bdp24

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bdp24
10,208 posts
 

ozzy, Black Hole 5 is a 1-3/8" thick cabinet damping pad with adhesive on one side. You attach it to the cabinet's interior walls to damp panel resonance and absorb internal reflections. GR Research sells an even better panel damping material named NoRez.

Bracing dowels can be secured to interior cabinet walls with wood glue or epoxy.

bdp24's avatar
bdp24
10,208 posts
 
Add bracing---dowels attached to opposing walls. It will not only decrease the enclosure's internal volume, but make it more non-resonant (or at least raise the frequency at which it resonates, thus making the resonance less audible).
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