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@MatB @Luminair After about 5hrs of watching movies and listening to music (Bluetooth and RCA), I used an infrared thermometer and found that the BT20A Pro (with 48V PSU) stayed constant at 40°C

Thanks @MatB for digging deeper. After reading @Luminair reply, I went and read the data sheet (Section 7.4: Thermal Information and 9.4.1.5 Overtemperature Protection OTW and OTE) from Texas Instruments. Like @Luminair said, my Cambridge Audio being a class A/B is massive, has...

I've had the BT20A pro, 48V power supply for about 5 days, and I too have noticed that the amp is warm to the touch... It doesn't get unbearably hot though. Even at idle, the metal enclosure is warm to the touch. Playing music through a pair of KEF Q350 and running a REL Subwoofer via the...