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VLZ4 4•Bus Features
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
Rear Panel - Connections
1. Mic Ins
This is a female XLR connector that accepts a
balanced mic or line level input from almost any type
of source. These Onyx mic preamps feature higher
fidelity and headroom rivaling any standalone mic
preamp on the market today. These circuits are
excellent at rejecting hum and noise.
The XLR inputs are wired as follows:
Pin 1 = Shield or ground
Pin 2 = Positive (+ or hot)
Pin 3 = Negative (– or cold)
Professional ribbon, dynamic, and condenser mics all
sound excellent through these inputs. The mic/line
inputs will handle any kind of level you can toss at
them, without overloading.
Microphone-level signals are passed through the
mixer's splendid microphone preamplifiers to become
line-level signals.
The Onyx preamps accept balanced line-level signals
because the mixer is equipped with a -20 dB pad on
channels 1-16 (2404VLZ4) and channels
1-24 (3204VLZ4) so hot signals may pass.
See Appendix B (page 31) for further details and
some rather lovely drawings of the connectors you can
use with your mixer.
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
2
1
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
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.
Phantom power may be selected by pressing up on the
mixer's phantom [21] switch.
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 are certain it is safe
to do so.
2. Line Ins
These 1/4" jacks share circuitry (but not phantom
power) with the mic preamps, and can be driven by
balanced or unbalanced sources.
To connect balanced lines to these inputs, use a 1⁄4"
Tip-Ring-Sleeve (TRS) plug, wired as follows:
Tip = Positive (+ or hot)
Ring = Negative (– or cold)
Sleeve = Shield or ground
To connect unbalanced lines to these inputs, use a
1⁄4" mono (TS) phone plug, wired as follows:
Tip = Positive (+ or hot)
Sleeve = Shield or ground
14
13
12
11
14
13
12
11
14
13
12
11
MONO
TAPE
MAIN OUT
IN
INSERT
LINE
OUTPUT
L
9
U
R
+6
LEVEL
TIP SEND
RING RETURN
BAL / UNBAL
8
10
6
UNBALANCED
Owner's Manual
3
10
9
8
7
2
10
9
8
7
1
10
9
8
7
OUT
USB
L
18
R
9
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