Allen&Heath ZED POWER - Manual (Page 28)

Allen & Heath 28 ZED POWER 1000
AMPLIFIER SECTION
Protect and Limit LEDs
The Protect LED will light up when the amps have
been shutdown with the AMPS STANDBY button
or if a fault has occurred with the amplifier.
The limit LED will light when the speaker output
starts to get close to the power rails of the ampli-
fier, typically when distortion gets to 1% or high-
er. The mixer will automatically limit the signal
level sent to the amplifier circuits.
NOTE: If the peak light starts to light brightly/
frequently reduce the Amp Level to avoid audible
distortion on the amplifier outputs or possible
speaker damage.
Amp Level
The amp level pots should be used to set the
relative amplifier output level for each channel.
These levels should be set up during sound
check so that during the performance the master
fader or aux fader can be used to control amplifi-
er level.
Selection switches
These switches are used to select the amplifier
source if no connectors are plugged into the
AMP INPUT TRS jack sockets.
AMP A can be sourced from the post fader main
mix left channel, or when pressed a mono sum of
main mix left & right post fader.
AMP B is from post fader main mix right channel
or post level pot AUX mix.
Bypass EQ
The stereo EQ circuit is in-line with the inputs of
Amps A & B. The circuit can be bypassed for
either side by pressing this button. This is useful
if you would like to use the EQ for feedback sup-
pression on the foldback speakers and not have
these frequencies removed from the main PA for
example.
9 Band graphic EQ
This is a stereo EQ circuit with a 12dB cut/boost
on each channel. See the frequency graph oppo-
site to see the filter response. This can be used
to shape the live sound or for feedback suppres-
sion purposes.