The Topping MX3s desktop D/A (digital-to-analogue) converter, stereo amplifier and headamp is a real Swiss Army knife that will be the perfect companion for a 2.1 system. With AK4377 DAC chip, 2x50W power, Bluetooth 5 connectivity, aptX HD and aptX Adaptive support, digital and RCA inputs, subwoofer output, remote control.