Drawmer SL22 Sound Level Limiter - Manual (Page 8)

8
CONTROL DESCRIPTION
THRESHOLD
The threshold control sets the signal level at which the
SL22 limiter circuit (protect) triggers.
MAX VOLUME
Set the maximum volume that you wish the audio signal
to reach - the output level leaving the SL22 will not rise
above this level.
If you wish to protect your speakers from pops and bangs
simply set the aud io levels to that whic h you are
comfortable, or those within the specifications of you
music system. However, in order to comply with noise at
work and local authority noise regulations the output
volume level should be calibrated (see calibration section).
SIGNAL
W hen lit identifies that an audio signal is present but is
not being limited. If the SL22 is connected correctly but
no led is lit then an error has occurred within the audio
signal path and should be investigated.
ALERT
The Alert LED lights when the signal level is within 6dB’s
of the threshold level at which the signal will begin to be
limited (i.e. protection occurs). The LED acts as a warning
and at this point no limiting is occurring.
The level set can be written in the white box underneath
PROTECT
When lit identifies that the level of the audio signal has passed threshold and the SL22 is limiting the level of the signal
in order to protect the speakers, the hearing of the listeners or complying to noise regulations.
The level set can be written in the white box underneath.
CHAPTER 2
A
ACCESS TO CONTROLS A & B
Once the SL22 is connected it is remarkably easy to set up having only two adjustable controls. These are placed on the left
side of the front panel behind a security plate. Tamper-proof screws are used to hold the plate to make unaurthorised adjustment
to the settings very difficult.
Access the controls by removing the two tamper-proof TORX screws that holds the plate using the tamper-proof screwdriver
supplied. Once set up the plate should be replaced using the tamper-proof screws. A security label can be placed across the
plate to further secure the settings.
B
C
D
E