Specifications

10
-10.0
-8.0
-6.0
-4.0
2.0
4.0
6.0
8.0
0.5
10.0
12.0
14.0
16.0
18.0
20.0
0.1 10.2 10 1005 20 502
0.0
dBW (ref 1 watt)
Power (Watts)
-2.0
from the distributed line. Use the formula
dB = 20×log D
or the Inverse Square guide below to convert distance-related attenuation to dB; you’ll need to add this figure
to the desired SPL and then subtract the sensitivity rating to determine how much more or less than 1 watt the
loudspeaker requires.
Distance from speaker
Power increase in dB; referenced to loudspeaker
sensitivity rating (1 watt @ 1 meter)
Calculating the necessary power is simple addition and subtraction if you use dBW, a decibel reference to watts
in which 0 dBW = 1 watt. This is useful because the sensitivity spec already uses a reference of 1 watt. Then
you can use the formula
Power (in dBW) = ( desired SPL ) + ( distance attenuation ) – ( speaker sensitivity )
To convert dBW to watts, use the graph at right or the formula
Power (watts) = 10
(dBW/10)