Klipsch Reference Series R-4B 2.1 Channel Sound Bar Built-in Dolby Digital Decoder True 2-way soundbar with two 3/4" horn-loaded dome tweeters and dual 2.5 woofers Wireless subwoofer with 6.5" down-firing driver 1 Optical digital, 1 Stereo Analog, Bluetooth and USB Type A inputs Virtual Surround, Voice Enhance and Night Modes