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Doug, why melamine glue, is it more flexible (and thus more damping) than traditional wood glue? By polyurethane sealer do you mean wood finish sealer, or yellow foaming gap sealant, or gorilla glue type foaming glue? Thanks
Thick aluminum is pretty expensive, but it does work good. A couple aluminum speakers were at axpona.
I think cement's resonant freq and Q will be high like the wood, so MDF being lower freq, lower Q and heavier might be better.
Wayne, that richlite stuff looks awesome. I forgot about your thread about that. There is a cabinet shop in my town that is listed as a richlite dealer. I'll see if they have some scraps. It would be cool to build a speaker with it. Does it have any resonance of its own when you knock it?
Toole shows studies that show that high Q resonances are less audiable then low Q resonances (there is also less energy under the curve to excite them)Also energy to excite a resonance is at a minimum inversly proportional to the square of the frequency, one can argue that they are actually inversly proportional to the forth power of the frequency.dave
Cool! The richlite is a single note of higher frequency, and shorter duration than the wood panels. Almost like glass.
Notice how the Richlite panel rocks gently back and forth after being tapped and the MDF panel swings wildly. The Richlite is a lot denser than MDF and it takes a lot more force to get it moving, somehow this relates to Newton's Laws of Motion:
I now have a video on YouTube that compares the resonant properties of three materials: 13ply 3/4" plywood, 1" thick Richlite, and 3/4" MDF. Each panel is suspended by a wire and tapped with a hammer. Check it out.http://www.youtube.com/watch?v=SkSxH40x5SAWayne
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