The Denon Professional DN-350 MP will interface to any sound system via balanced or unbalanced outputs, and play audio files from the USB port, 3.5 mm stereo AUX input, or from a Bluetooth device.  This 1RU player also features a smartphone shelf to hold your device while it is paired via Bluetooth and charging from the USB charging port conveniently located on the front panel. Up to (8) Bluetooth devices can be stored in the player's memory.