...the idea for hi-fi speakers is to make the box walls as dense and thus non-resonant as possible, right? i'm sure stone or concrete could be used, but who would want to move those around? solid 1" slab exotic hardwoods would be nice too, but again, heavy, and also very costly.
i was in the shower awhile ago and i thought: why not make the box walls out of double walled, injection molded plastic, similar to a coleman camping cooler or what have you...? near the bottom would be a drain plug, and on the top, a filler cap.
so when the speakers are shipped to you they are featherlight; you open up the cap and fill em up with tap water. voila: a heavy, dense, non-resonant speaker box, that is very cheap, and very lightweight on moving day(drain em)!
i figured at 1 gram per cc they'd be denser than almost all woods(some very hard woods sink in water), and if you made the wall cavities 2" thick, it would be solid as a rock...
the drivers would screw in like any other speaker. the inside of the cabinet could be braced and tuned like any other cabinet.
what say... should i patent it? Yellow_Light_Colorz_PDT_16