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Nice, Ben.I've been idly toying with the notion of getting my loudspeaker cabinets rebuilt by someone with access to CNC facilities, is that something you might get done? I doubt it is a cheap thing to do, but I really think it could benefit designs with strangled potential. Better materials, proper bracing, curved sides etc.
For magisters I have long thought of side firing woofers at floor level (a la audio physic) with a slim front baffle, perhaps with a decent cone midrange and tweeter upgrade (ATC or Ruark). The whole thing would need calculating for correct internal volume as the are infinite baffle, and would likely stand a metre and a half tall. In gloss piano white. Crossover design by our Col it even RFC, and I bet they would image nicely!
I was thinking about screwing additional mdf sheets around the cabinets. They would be enormously heavy! Would be interesting to sandwich sone insulation in between.(So not merely wool, but sheep flesh too...?)
Well I'd suggest that a second material ought to have different properties to the first. So if you used MDF for the cabinet, go for HDF or birch ply. Sandwich dampening material between, apparently this should be soft. Birds custard should do.Then fleece or foam inside.I bought fleece on Colin's advice when I fettled the Triangles, but misunderstood. I bought a bag of fleece rather than a hide, which is what he meant. I had to stitch bags together out of mesh to hold it.I'll go off and look up what I was reading, and link to it.
Not cavity as such, rather sandwich (mmm). Two different materials, with a gooey constrained damping 'filling'.Take a look, especially at the first four or five pages, of the linked thread relating to Harbeth. I think that's where the best info was.I certainly learned a lot about cabinet behaviour I wasn't aware of.