The lowly cinder block isn’t good for much other than building. But Cinder Speakers, a collaboration between industrial designer Daniel Ballou and Dashdot, turns a pair of concrete cinder blocks into high fidelity speakers. Since concrete minimizes vibrations the material is a logical choice, or at least from that perspective since you’ll need to find a relatively solid surface on which to rest such hefty speakers, and perhaps line the base with a felt pad or similar to avoid scratches. The kit, still in development stage and with a target price of roughly $150, ships as pre-assembled panels that attach to either side of the blocks and feature a 5-inch driver, a tweeter, a crossover, and an input jack on the right side of the front panels. Where you get the cinder block, on the other hand, is your problem.