Fosi Audio BT20A PRO - The Small Performer

Hi guys,

I've had the opportunity to get this amp and test it, with stock 32V power supply; with original op-amps and with upgraded OP2134 op-amps. I've tested it on my three systems using Bluetooth or RCA, with different kinds of music - Rock, Pop, Electronic, R&B and Jazz. My original systems are AB class amplifiers (NAD C355BEE, Onkyo Integra 8690, NAD T742).

System 1: Focal JM Lab Chorus 714 speakers (8 Ohm, 91dB), played over Bluetooth (Tidal FLAC) and over RCA (NAD T545 CD...

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