Hi-Res audio for higher bit depth and sample rates of 96 kHz or higher ^^ 155 watts total power ^^ Built-in Texas Instruments TAS5754M built-in amplifier (40 watts x 2 for speakers ^^ 75 watts x 1 for subwoofer) so there is no need for outside amplifier or receiverjust plug into source and play ^^ Bluetooth 4.1 with Qualcomm aptX for CD quality sound and for pairing capability to stream audio playback from compatible devices