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SPEAKER HEIGHT / SPACING
A speaker's sensitivity specification gives you its Sound Pressure Level
(SPL) output at one meter with one watt input. The accompanying
illustration shows how you can determine SPL output at a given
distance based on the followingconstants that apply to sound:
1. Every time you DOUBLE THE POWER input to a speaker you
increase its SPL by 3dB.
2. Every time you DOUBLE THE DISTANCE from a speaker you lose
6dB of SPL.
Background Music Levels-SPL levels usually 3-6dB above ambient
sounds, approximately 70-85dB SPL's.
Foreground Music Levels-10dB+ above ambient sounds,
approximately 85-95dB SPL's.
Use an SPL meter during the businesses' peak traffic hours to
determine ambient levels.
Speaker Sensitivity: 89 dB
If speaker wattage tap is 3.8 watts
1 meter = 94 dB SPL
2 meters = 88 dB SPL
4 meters = 82 dB SPL
1 meter = 3.3 ft
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