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I got a pair of Altec 288s drivers and a pair of horns and Im thinking of building a pair of large uglyish cabnets al-la VOT or atleast something of that nature with some sort of horn apature for the mid range. Its all very up in the air at this point.Anyway, as for building materials,
I was wondering if anyone had tried affixing sheet rock to the interior walls for strength and a hard but unresonant interior. Now Im not talking about drywall (although this might work) but the sort of sheet rock that is used on bathroom walls. In case you dont know what this is, its a very hard sheet of "concrete" .5-3/8inch thick which is strenghthend internally by thin sheets of fiberglass/metal mesh. Its heavy, and much much stronger then drywall. Its a pain to cut and you could never use it for the box itself but you could affix it to the interior walls.Is this an interesting idea, is it stupid, have you tried it?
Am I forgetting some fundamental about speaker building, please share your opinions.
What you're talking about is called Wonderboard.
I have some "concrete board" underlayment I'm trying right now, so far I say it is fantastic! This stuff is DEAD, I have only tried it with a small 1 cubic foot cabinet, but am working on a pair of 12 cubic footers with the material and baltic birch ply with two high efficiency 15" woofers per vented cabinet to be used in an otherwise horn system. The material sound a lot better than 1,2,or 3 layers of dynamat with the birch ply or mdf.Mike Bates
Man Ray, a famous photographer wrote in his autobiography tha Constantine Brancusi ( famous sculptor ) had carved some loudspeaker enclosures from solid marble blocks. He went on to say that although the drivers were not exceptional, the sound eminating from them surpassed anything he had ever heard, regardless of cost.
That is the extent of his account, as they were hastily gathering things up to avoid the approaching Nazi Army.But, it appears that historically, at least one genius has taken the path you have chosen. Or at least one close to it.
Luck Don B
I Don't have first-hand knowledge on this but I have seen this material mentioned on other forums with favorable results when used as damping/vibration control. Constrained layer damping may be worth investigating here. Perhaps the material could be affixed with some type of silicone or other viscous adhesive that would remain flexible after curing. That, combined with .75-1.00 inch cabinet walls would yield a very big but very dead enclosure.
I have read of a design in Speakerbuilder Mag. a few years ago in which that material was used by gluing it to the cabinet walls. It did add alot of mass to the cabinet, however it is very reflective to most frequencies. Good for dampening if you take care of the reflections.The carpenters cut it by scoring a line in with a box knife, than snapping it (much like glass). hope that helps.
Come to think of it, I may have read about it around here and but didnt realize it. The idea re-occred to me when I was reading a review of some concrete speakers. (a negative review no less)Thanks for the help
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