So the winner is the PAM8302A, with 2,5W output it is still loud enough, produces way less noise than the PAM8402A but is mono. However I don’t think it is necessary to have stereo sound in the blaster, besides the sound files are mono anyway to reduce their size. Apart from that anybody could solder any other amplifier to the mainboard, it is just that I’ll place the solder eyes to match the PAM302A layout.