ALLEN & HEATH ZED 420

Allen & Heath 15 ZED-4 BUS User Guide
MONO INPUT CHANNEL
1
2
3
4
5
1
Microphone Input Socket
Standard 3-Pin XLR socket wired as Pin 1=Chassis, Pin 2=hot (+),
Pin 3=Cold (-).
2
Line Input Jack Socket
Standard 1/4” (6.25mm) Jack socket for balanced or unbalanced line
level signals. Wired Tip=Hot(+), Ring=cold (-), Sleeve=Chassis.
The Line input overrides the Mic input, so if you want to hear some-
thing plugged in to the xlr socket, make sure nothing is plugged into
the Line input.
3
Insert Jack Socket
Standard 1/4” (6.25mm) Jack socket for unbalanced insert send and
return signals. Wired Tip=send, Ring=return, Sleeve=Chassis.
Nominal level is 0dBu. The insert point is after the 100Hz filter and
before the EQ.
4
Gain Control
This adjusts the gain of the input amplifier to match the signal level
of the input. The gain is varied from –6dB (attenuation) to +63dB
for signals plugged in to the xlr socket (Mic Input) and –10dB to
+26dB for signals plugged into the Line input jack.
5
100Hz Hi-pass Filter
The Hi-pass filter is used for reducing pop noise and rum-
ble from microphone signals. It is a 2-pole (12dB per oc-
tave) filter with a corner frequency set at 100Hz.
The filter affects signals from both Mic XLR and Line jack
socket.
10.00 Hz 100.00 1000.00 10000.00 30000.00
-50.00
-40.00
-30.00
-20.00
-10.00
0.00
10.00
dBr
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6
48V Phantom Power Switch
Applies +48V to pins 2 and 3 of the XLR input though 6k8 resistors
for phantom powered condenser microphones.
MIC
INSERT
LINE
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10
20
30
40
50
DIR OUT
48V
HPF
100Hz
1
1
1
1
IN
Direct Output Socket
Standard 1/4” (6.25mm) Jack socket. Wired Tip=Hot(+),
Ring=cold (-), Sleeve=Chassis. For recording individual channels,
factory default is prefade signal (post mute).
The nominal level is 0dBu and the output is impedance balanced.
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