One of those boring facts about speakers known only to audio wonks is that many, if not most, have enclosures made of medium-density fiberboard (MDF). The reasons are many: It's a rigid substance that doesn't warp, and it makes the audio sound good. It perplexes us, then, as to why anyone would want to build speakers out of concrete.
While we agree that these concrete speakers are "works of art," which the designer claims on his website, we're not so sure the hard-as-rock speakers — which weigh 35 pounds each — will sound any good. Made to accompany a small shelf system, the stereo pair sells for $700 (or $600 with the drivers removed). At least they'll never fall victim to termites.