Allen&Heath DP 1000 USER GUIDE - Manual (Page 18)

A
NALOG
C
ONTROLS
MONO
MIN MAX MIN MAX
GAIN GAIN
MAX MIN MIN MAX MAX MIN
GAIN GAIN GAIN
MONO
MIN MAX MIN MAX
GAIN GAIN LEV
MIC 48V
MIN MAX MIN MAX
GAIN LEV
STANDBY
MAX MIN
PROTECT
GAIN Matches the sensitivity of the channel input to
the connected source. Use the headphones monitor to
check the signal quality and adjust the control until
the meters read an average 0dB with the loudest
peaks up to ‘+6’. If set too high the signal may clip
and produce a harsh distorted sound. If set too low
the signal to noise ratio is reduced and excessive
noise may be heard. Always turn back the gain if the
red channel peak indicator flashes.
MONO Press this switch to sum the stereo channel
left and right signals together to produce a mono
signal, or when using the channel with a mono source
such as a microphone. If the switch is not pressed
the mic signal will appear on the left channel only.
MIC +48V Press this switch when using
microphones which require phantom powering. This
puts +48V DC on all the XLR mic input sockets.
Note that you can connect non powered microphones
to powered sockets without damage as long as
balanced leads are used. The switch is recessed to
prevent accidental operation and should be operated
with a pointed object such as a pen.
To prevent damage to the microphones
always use balanced mic leads. Do not connect
unbalanced sources to powered inputs. Always
plug the microphones in with +48V turned off,
and only switch +48V on or off with all output
faders turned down. Failure to do this may result
in loud thumps and damage to external
equipment.
AB LEV These are the volume controls which set the
listening level of the amplifiers. Start with these set
to minimum and adjust the faders until the meters
read around 0dB for the average signal level. Raise
the level controls until the required sound level is
heard from the loudspeakers. When set correctly the
faders and meters may be operated within their
correct range. When set incorrectly distortion or
excessive background noise may result. The normal
position for loud program should be between 12 and
3 o’clock.
To avoid the possibility of unexpected high
sound volumes always set the AB level controls to
minimum when changing the amplifier
configuration.
☺
Tip Take time to set the input and output levels
correctly. This will ensure that you get the best
performance from your system. The meters and
headphones monitoring system are provided to help
you set the levels accurately. If the levels are set too
high then distortion may result. This will be
indicated by the channel peak indicators flashing. If
the levels are set too low then excessive background
hiss and noise may be heard. This will be indicated
by very low meter reading
S
TANDBY
S
WITCH
, P
ROTECT
I
NDICATOR
LEV
MIN MAX
LEV
STANDBY
MAX MIN
PROTECT
Press this switch to put the console into standby
mode. This disconnects the loudspeakers using
relays (
DP1000 only), turns off (mutes) all the
outputs, and locks the controls. The sound of the
relays switching can be heard when the switch is
pressed. Standby should be used when the console is
left unattended to prevent the settings being tampered
with, when equipment is plugged in or out, and when
the system configuration is changed.
The display shows when standby mode is active.
The red indicator also lights when the amplifier is in
protect mode. This occurs for two seconds when the
icon is switched on to allow the circuits to stabilise
before connecting the speakers. It also occurs
automatically to protect the speakers if a fault or
excessive temperature is detected.
If the red indicator is lit with the switch in the up
position and power applied for longer than two
seconds then a fault may be suspected.
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