A sound so immense, the housing need to be forged from concrete. The P.A.C.O. Bluetooth Speaker is a gesture-controlled gem with a pair of 6W amps, a front-firing 3.5-inch speaker and 2-inch surface transducer for added warmth. You’ll find no audio jack, with all tunes streamed wirelessly from your smartphone or media player. A nice added touch is the option to build it yourself from open source plans.