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Shall I buy MEANWELL GS60A18-P1J (60W) or Meanwell GS120A20-P1J (120W)?

Raspberry Pi 3 B+ with my USB microphone consumes 10W at full load.

Since 4ohm speakers that output 40W can draw more than 50W, I suspect that 60W is not enough. Raspberry Pi can reboot due to lack of power.

An amazon review for HiFiBerry Amp2 said that an 18V adaptor causes Raspberry Pi to reboot.

Which one between MEANWELL GS60A18-P1J and Meanwell GS120A20-P1J should I buy?

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