Most speaker DIYer’s will tell you that if you want great sound out of a cabinet you want it stiff and dampened so that box doesn’t resonate with changes in air pressure while others say you want the sound qualities that wood offers. Now there’s a speaker that offers both. The P.A.C.O. Concrete Speaker ($CALL) is probably the stiffest cabinet you’ll find on the market. The concrete cabinet will enhance the bass while the Fir Harmonic board top piece gives the treble warmth and defuses the sound 360 degrees. The speaker also features bluetooth connectivity and gesture control. With a wave of your hand you can change the volume, play, and stop or skip tracks. The P.A.C.O has a 3.5″ mid/low range driver and a 2″ surface transducer and has a frequency range is 85Hz – 20,000Hz.