Audio selector (4 amplifiers – 2 speakers) review, teardown and analysis

I bought from Aliexpress this audio switch. It’s a device where you connect several audio amplifiers and several speakers, and then you can make any combination amplifier- speaker you want. Easy, clean, and fast, without having to connect/disconnect cables, make a mess of wires, drag the speakers and the amplifiers around, and lose a lot of time.
It’s more for testing and comparison reasons, where you change the sound seamlessly, without disturbance, to hear the differences between different systems.

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