Songistix today introduced the Monsoon MH-505 speaker system, a surround sound version of its entry level speakers. The MH-505 features four flat-panel satellite speakers with 2.5-inch mid-range cones, a bandpass subwoofer, and a new control for adjusting master and bass volume, rear-front fader, and mute, as well as a headphone jack. The system sells for US$179.