LRAD
450XL
GENASYS INC.
Manual Part No.: 112343-00 Rev. E
2
1.1 Acoustic Volume Levels
The LRAD-450XL acoustic device is capable of producing a maximum continuous sound pressure
level (SPL) of 145 dB in order to achieve adequate communications over long distances. The
sound pressure levels achieved at full volume at distances of 40 meters or less may cause
hearing damage if people are exposed to these for long periods of time. The following graphic
shows the LRAD-450XL’s maximum volume levels over distance. The LRAD-450XL’s volume
decays by approximately 6 dB per doubling of the distance down-range.
The following range chart is marked to correspond with the Department of Defense’s MIL-STD-
1474D (Noise Limits), which dictates maximum daily exposure durations for various sound
levels. Personnel within a 40 meter range should wear hearing protection at all times or should
not be exposed to output from the LRAD on a daily basis. Personnel in the range of 40 to 1000
meters should wear hearing protection or limit their daily exposure times to the durations
listed in the tables that follow. Personnel beyond the 1000 meter range may be exposed to the
LRAD’s output continuously on a daily basis without risking hearing damage.
Figure 1: LRAD-450XL SPL vs. Distance
0
20
40
60
80
100
120
140
160
1
10
100
1000
10000
SP
L i
n d
BA
Range in Meters
SPL vs. Distance - LRAD-450XL
115dB at 40m
