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user manual
LMS-A6
LMS-A6 user manual
Page 12
restrict the full undistorted output of the amplifiers. Note that the actual output power available
often depends on the mains supply voltage, which may ‘sag’ during heavy performances.
In a system where the amplifiers are capable of exceeding the ratings of the speakers, set the
threshold to a level appropriate to the speakers and NOT the clipping point of the amplifier. This is
normally achieved by feeding the system with pink noise at the maximum level required and then
turning down each limiter threshold switch until the yellow LIM LED is just flashing.
Limiter Cancel
When up (CANCEL), this switch will disable all limiters and the yellow LIMITER CANCEL LED will
light. It is normally only used when setting up and calibrating - or trouble shooting - the system.
When the limiters are cancelled the output meters will continue to operate normally up to the
limiter threshold.
Output Level and Limiter Meter
The lower four green LEDs show the signal level in dB relative to the limiter threshold. i.e. they
always show the signal headroom that is available before the limiters will start operating. The
yellow LIM LED lights when the threshold has been reached and the limiter is operating. The top
red LED lights when the input signal is causing 4dB or more limiting to occur. If during use the +4
LEDS are on for more than occasional brief flashes the input signal is too hot and should be
turned down at the mixing console to reduce distortion.
Band Mutes
Each output has an independent MUTE Switch and red MUTE LED. These are latching switches
which will retain their settings even when power is turned off and on again.
Note that the MUTE LED will always follow the position of the MUTE switch regardless of the
status of the standby mute. If the expected output signal appears to be muted but the MUTE LED
is not lit then check the STANDBY MUTE LED