VIZIO SB4551-D5 45&rdquo; 5.1 Slim Sound Bar System The complete 5.1 channel true surround sound home theater solution with incredible audio performance Download the VIZIO Smart Cast app to turn your smartphone or tablet into a powerful touchscreen remote Simply tap the Cast button from 100+ audio apps you already know and love to start playing on your sound bar. 104 dB of room filling, crystal clear sound with less than 1% total harmonic distortion