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MONITOR
SUBGROUP INSERTS
TIP SEND, RINGRETURN
17
L
4
3
12
2
15
SUBGROUP OUTS
MONITOR
MONO
BAL / UNBAL
16
R
4
3
11
2
AUX INSERTS
TIP SEND, RING RETURN
14
6
5
4
3
2
AUX SENDS
BAL / UNBAL
13
6
5
4
3
2
100 - 240 V
50 - 60 Hz 55W
POWER
ON
22
20
19. Talkback Mic
This is where to plug in an external talkback
microphone. Dynamic and self-powered condenser
microphones work well.
20. Power
Press the top of this rocker switch inwards to turn on
the mixer. The front panel power LED [57] will glow
with happiness, or at least it will if you have the mixer
plugged into a suitable live AC mains supply.
Press the bottom of this switch to put the mixer into
standby mode. It will not function, but some circuits are
still live. To remove AC power, either turn off the AC
mains supply, or unplug the power cord from the mixer
and the AC mains supply.
As a general guide, you should turn on your
mixer first, before any external power
amplifiers or powered speakers, and turn it
off last. This will reduce the possibilities of any turn-on,
or turn-off thumps in your speakers.
21. 48V Phantom Power
Most modern professional condenser mics require
48V phantom power, which lets the mixer send
low-current DC voltage to the mic's electronics through
the same wires that carry audio. (Semi-pro condenser
mics often have batteries to accomplish the same
thing.) "Phantom" owes its name to an ability to be
"unseen" by dynamic mics (Shure SM57/SM58, for
instance), which don't need external power and aren't
affected by it anyway.
Press the top of this switch in if your microphone
requires phantom power. (Always check the position
of this switch before connecting microphones.) A red
LED [56] will illuminate just above the main mix
meters [58] to indicate that phantom power is active.
This is a global switch that affects all mic channels' XLR
jacks at once.
14
VLZ4 4•Bus
21/22
23/24
INSERTS (TIP SEND, RING RETURN)
BAL / UNBAL
BAL / UNBAL
1
20
19
L
4
MONO
LINE (BAL / UNBAL)
1
20
19
R
STEREO RETURNS
BAL / UNBAL
1
2
1
ONYX MIC PREAMPS
L
5
MONO
1
2
1
R
20
19
RIGHT
TALKBACK
MIC
PHANTOM
ON
INSERT
LINE
TIP SEND
RING RETURN
BAL / UNBAL
21
19
8
18
17
16
15
18
17
16
15
18
17
16
15
LEFT
MAIN OUT
MAIN OUT
INSERT
LINE
7
7
TIP SEND
RING RETURN
BAL / UNBAL
8
Never plug single-ended (unbalanced)
microphones, or ribbon mics into the mic
input jacks if phantom power is on. Do not
plug instrument outputs into the mic XLR input jacks
with phantom power on, unless you know for certain it
is safe to do so. Be sure the main level [75] is turned
down when connecting microphones to the mic inputs
when phantom power is turned on, to prevent pops from
getting through to the speakers.
22. Power Connection
This is a standard 3-prong IEC power connector.
Connect the detachable linecord (included in the box
with your mixer) to the power receptacle, and plug the
other end of the linecord into an AC outlet. The
VLZ4 4•Bus Series Mixers have a universal power
supply that can accept any AC voltage ranging from
100 VAC to 240 VAC. No need for voltage select switches.
It will work virtually anywhere in the world. That's why
we call it a "Planet-Earth" power supply! It is less
susceptible to voltage sags or spikes, compared to
conventional power supplies, and provides greater
electromagnetic isolation and better protection against
AC line noise.
Disconnecting the plug's ground pin is
dangerous. Don't do it.
14
13
12
11
14
13
12
11
14
13
12
11
MONO
TAPE
MAIN OUT
IN
INSERT
LINE
OUTPUT
9
L
U
R
+6
LEVEL
TIP SEND
RING RETURN
BAL / UNBAL
8
10
6
UNBALANCED
3
10
9
8
7
2
10
9
8
7
1
10
9
8
7
OUT
USB
L
18
R
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