Sat, I don't have any comment on this absurd amplifier question(or is that a comment in itself?), but as to permissible sound levels to avoid hearing damage, the source that you quote appears to be too permissive. Standards adopted by the EPA and World Health Organization for "community" levels, not those suggested for workplace exposure where some hearing loss is considered acceptable(by some), are those which are advisable for listening in the home, and as shown in the third table here are substantially lower than the workplace suggestions.

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Enjoy the music, not the equipment.