Nobsound Mini Bluetooth Power Amplifier Stereo Hi-Fi Digital Amp 2.0 Channel 50W×2 with AUX/USB/Bluetooth Input Wireless Audio Receiver PC Sound Card with Power Supply (Black)

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I have also enclosed a picture of the output waveform with a 4 Ohm load connected to one of the outputs when driving the amplifier with a sine signal. AUX mode has slightly better sound but I find myself connecting mostly with Bluetooth because it's so convenient. Read more My first unit had a problem with the AUX section and the seller sent a new one immediately. This results in a strange stereo image where bass is affected and voices and instruments cannot be placed properly, a fuzzier stereo image.

Given the fact that the connectors aren't hand wired and are soldered onto the PCB correctly this leaves a few conclusions.There is general consensus in the audio world which of the pins are assigned to a signal as used by HIFIMAN for instance. Class-D amplifiers work by switching the output between ground and the supply voltage at a high frequency.

Just check out Audio Space, Cayin, Prima Luna, Consonance, Mingda, Doge and Line Magnetic are all excellent.

When manufacturers measure amplifier dirtortion they usually measure distortion by adding a low-pass filter after the Class-D amplifier. As such I would bet this amp does not meet the FCC Part rules section 15B which is a requirement by law and as such most likely is even illegal to distribute in the US. The amp and speaker combination works really well with jazz/folk/accoustic music but can get a bit muddled with complex music like rock or orchestral music.

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Those of us at the coal-face (techs, engineers, etc) have a very healthy disrespect for Chinese made products.