The incredible sound of the DRS-12BLU is defined by its highly efficient and articulate 800W Class-D amplifier. This relatively new design in power amplifiers is a proven success in the professional audio world for several reasons: Class-D directs nearly all of the signal directly to the transducers rather than causing waste through heat dispersion as in other amplifiers. The Class-D circuits react faster to signals and can render fast transients and sonic elements with more clarity and realism. Class-D also creates near-zero distortion regardless of the volume level. Bluetooth wireless connectivity and a USB/SD MP3 Player are directly built into the DRS-12BLU so that you have options for track playback and connectivity. With the option of Bluetooth you can play tracks directly from a wireless device and roam around the room and listen.