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Calculate Sound Pressure Level at specified distance to loudspeaker


Sensitivity in dB per 1 watt and 1 meter	dB/W/m
Amplifier power of each loudspeaker	Watts
Number of loudspeakers	pieces
Distance to loudspeakers	meters	feet



Generated sound pressure level

Table of Sound Levels

Sound sources (noise) Examples with distance	Sound pressure Level L_p dB SPL
Jet aircraft, 50 m away	140
Threshold of pain	130
Threshold of discomfort	120
Chainsaw, 1 m distance	110
Disco, 1 m from speaker	100
Diesel truck, 10 m away	90
Kerbside of busy road, 5 m	80
Vacuum cleaner, distance 1 m	70
Conversational speech, 1 m	60
Average home	50
Quiet library	40
Quiet bedroom at night	30
Background in TV studio	20
Rustling leaves in the distance	10
Hearing threshold	0

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