ALLEN & HEATH ZED 420 User Manual page 20

AUX1
PRE
8
+6
O O
AUX2
PRE
O O +6
AUX3
9
O O +6
AUX4
+6
O O
POST
PRE
AUX5
POST
+6
10 O O
AUX6
POST
O O +6
=
BAL
11
L R
ODD EVEN
12
MUTE
PFL
13
PK !
14
SIG
10
L-R
15
0
M
1-2
3-4
20
16
30
OO
17-18
Allen & Heath
STEREO INPUT CHANNEL
Auxes 1 & 2
8
Auxes 1 & 2 send a mono sum of the stereo channel left & right signals
sourced from pre-fader.
Auxes 3 & 4
9
Again, a mono sum of the stereo channel left & right signals, the source be-
ing switchable pre or post fader.
Auxes 5 & 6
10
Auxes 5 & 6 take their source from a mono sum of the stereo channel left &
right signals after the fader.
Balance control
11
The Balance control varies the relative levels between the left and right
channels.
Mute Switch
12
Mutes the signals to the main L R, M and Group buses as well as the Aux
sends.
PFL Switch
13
The PFL (Pre-Fade Listen) switch sends a mono sum of the stereo channel
channel signal to the PFL bus.
Signal & PK! LED
14
The Signal LED illuminates dimly at a threshold of –16dB on either left or
right channels and gets brighter with higher level signal. The source for the
signal & peak LED's is just after the EQ IN switch.
The PK! LED illuminates when the signal just after the EQ IN switch is
within 5dB of clipping.
Routing Switches
15
The routing switches connect the post-fade signal to the mix buses via the
balance control for L_R and the groups. For minimum noise from the mix
bus summing amplifier, leave the switches in their up positions if the channel
signal is not required on the bus.
Fader
16
The 100mm fader affects the level of the channel signal to the left & right,
mono and group buses and Auxes 5 & 6. Also Auxes 3 & 4 if switched to
post-fade. There is 10dB of gain at the top and the unity gain position is
marked by "0".
21 ZED-4 BUS User Guide