Samsung HT-F455K Region Free Dual Voltage Home Theater System (Black) 5.1 Channel, 1000 Watt Region Free Home Theater Watch movies from your USB Crystal Amplifier Plus available, CD Ripping available, 4 Tall-boy speakers, Football Mode available, Number of Sound Modes (DSP) x 8, Virtual Surround 5.1ch, Smart Volume available HDMI ARC (Audio Return Channel) allows you to easily connect compatible devices to process the TVs audio signal without a separate optical cable to your receiver. Samsungs proprietary digital amplifier technology, Crystal Amplifier Plus, delivers HD quality sound through you Samsung Home Entertainment System.