Mounting Position
The Sentry should be mounted on a flat solid surface preferably where it can be seen by the
persons affected by its use (D.J., band, etc.). It should be located in a position where it cannot be
tampered with, e.g. a minimum of 8 feet (2.5 meters) from the floor, ideally on a wall facing the
noise source. It is not necessary to have a microphone suspended above the band or dance
floor. If the Sentry can hear the noise source above the background noise the unit can be
calibrated accordingly.
Avoid positions that are too close to the noise source e.g. in a typical concert room with the stage
area at one end the Sentry should be positioned centrally away from the stage at a minimum
distance equal to the stage width. If there is more than one source of noise, e.g. several
instruments in a band the Sentry should ideally be at a position equal distance from each
instrument. (see Fig1)
Ideal Position
w
“A”
x “W”
Sentry Stage
At least 2.5m
y
From Floor level
z
Fig 1
Distance “A” should never be less than distance “W”.
Poor Positioning
w
x
Stage
Position (B)
y
Sentry
Sentry
z
Better position
Poor position
Fig 2
In Fig 2 the instruments y&z will appear louder to the Sentry than instruments w&x. Moving the
Sentry back away from the stage to position (B) will minimise the problem
In order to help solve difficult location problems provision is now included to connect a remote
microphone to the Sentry MK2. See Drg No 879 for more details.
Page 3
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
1234
1234
1234
1234
1234
1234
1234
1234
1234
1234
1234
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
123
