Polk Audio AM1450-A Surround Bar 400 CHT Polk's patented SDA surround technology delivers a rich, enveloping listening experience from a single source; no rear speakers or special room characteristics are required 7CH, 5CH or LCR configurable all from a single switch Easy plug-and-play connections, and no complex setup or calibration needed. It works right out of the box! Installs anywhere easily, with the simple secure wall-mount bracket or shelf cradle