This small, compact, versatile and high-performance O-Noorus PA-70 Class D amplifier uses an Infineon MA12070 amplifier chip and is thus capable of delivering 2x55W power at 4Ω (1% THD). Practical, it incorporates an unbalanced stereo RCA input, a USB-A port and also a Bluetooth 5.0 receiver for wireless music streaming from a smartphone, for example. Outputs include speaker terminals and a subwoofer output (RCA) for setting up a 2.1 audio system. The front panel features a volume control knob, associated with an NJW1194 controller, as well as two gain control knobs for bass and treble (+/-10dB). All components are housed in a sturdy, sober CNC-machined aluminum case.