What was the power output of the speaker assuming uniform spherical spreading of the sound and neglecting air/

at a rock concert a db meter registered 130db when placed 3.4 m in front of a loudspeaker on the stage. how far away would the sound level be a somewhat resonable 90 db

112 metres
The distance law for the sound pressure p is inverse-proportional to the distance r of a punctual sound source.

~4.9 metres would yield 90dB, assuming no other interference.

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