This calculator provides the required electrical power (power output from the amplifier) to produce a desired Sound Pressure Level (SPL) at a given distance, along with an amount of headroom to keep the amplifier(s) out of clip.
Distance to listener :		Meters Feet
Desired sound pressure level at listener :		dB SPL
Loudspeaker sensitivity rating (at 1 Watt at 1 meter) :		dB
Amplifier headroom :		dB ("0" if none desired)
Error: All fields must be entered. Calculate
Amplifier Power required = Watts

Sound sources (noise) Examples with distance	Sound pressure    Level Lp 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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