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In Reply to: RE: Perforated speaker cabinets posted by Bill the K on June 23, 2024 at 04:42:45
The simplest way to control panel damping is constrained layer damping which is 2 layers for each panel glued together with a glue that never totally hardens. The panels can be the same material or different ones. A simple one going back over 50 years to the old IMF Monitor speakers is to finish a wood(MDF today) panel with Formica(or similar material) with the non setting glue.
Rigidity in this case would usually be bracing perpendicular to the walls, preferably close together, say 4 to 6 inches.
Follow Ups:
I think Q Acoustics has a dual panel with a gap filled by a fluid I think. I am thinking of perforations stuffed with dampeners. Easy to build and experiment. Maybe good for budget bookshelves. Maybe a wild idea. It would also work like semi open baffle variation. Sorry for the craziness.
Cheers
Bill
I'm totally aware of Q Acoustics cabinets. Rockport also uses constrained layer damping and probably a few others. I mentioned IMF because they did it 50 years ago. And, of course, in the 60s there were thw Wharfdale cabinets that were two layers with a middle layer of sand.
And some mildly controlled craziness is cool and fun.
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