Polk Audio AM9500-A Surround Bar 9500 BT Discrete Amplification of All 8 Channels with electronic crossovers means each driver is tailored for better efficiency, lower distortion and better dynamics, closely matching that of a full-range system OCA-Optimized Center Array creates a more realistic center channel experience for greater intelligibility of vocals and mid-range clarity. OCA also creates greater SPL, dynamic range and better off-axis response Play All Your Digital-Encoded Source Material: Dolby Digital 5.1, DTS 5.1, Dolby ProLogic II Bluetooth wireless technology aptX and AAC delivers high quality sound from your smartphone, tablet, computer or other compatible device Energy Star certified