MACKIE VLZ3 4BUS - Manual (Page 9)

Owner's Manual 9
Rear Panel - Connections
1. MIC INPUTS
This is a female XLR connector that accepts a
balanced mic or line level input from almost any type of
source. The mic preamps feature our XDR2 design, with
higher fidelity and headroom rivaling any standalone
mic preamp on the market today.
The XLR inputs are wired as follows:
Pin 1 = Shield or ground
Pin 2 = Positive (+ or hot)
Pin 3 = Negative (– or cold)
We use phantom-powered, balanced inputs just like
the big mega-consoles, for exactly the same reason: This
kind of circuit is excellent at rejecting hum and noise.
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 XDR2 preamps accept balanced line-level signals
because the mixer is equipped with a -20 dB pad on
channels 1-16 (2404-VLZ3) and channels
1-24 (3204-VLZ3) so hot signals may pass.
See Appendix B (page 29) for further details and
some rather lovely drawings of the connectors you can
use with your mixer.
VLZ3 4•Bus Features
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)
micro phones, 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 INPUTS
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
2404
USB L
R
TAPE
OUT IN
MONO
MAIN OUT
INSERT LINE
TIP=SEND
RING=RETURN (BAL/UNBAL)
RIGHT
MAIN OUT
INSERT LINE
LEFT
MAIN OUT
INSERT LINE
TIP=SEND
RING=RETURN
TIP=SEND
RING=RETURN (BAL/UNBAL) (BAL/UNBAL)
TALKBACK
MIC POWER
ON
PHANTOM
ON
2 1 2 1 6 5 4
2 1 6 5 4
AUX INSERTS
(TIP=SEND, RING=RETURN)
AUX SENDS
(BAL/UNBAL)
L
R
(MONO)
STEREO RETURNS
(BAL/UNBAL)
3
3
INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
LINE IN
(BAL/UNBAL)
20 19 18 17 16 15 14 13 12 11 9 8 7 6 5 4 3 2 1 10
MIC 20 MIC 19 MIC 18 MIC 17 MIC 16 MIC 15 MIC 14 MIC 13 MIC 12 MIC 11 MIC 10 MIC 9 MIC 8 MIC 7 MIC 6 MIC 5 MIC 4 MIC 3 MIC 2 MIC 1
XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE XD R2 MIC PRE
3 2 1 4
GROUP OUTS
(BAL/UNBAL)
GROUP INSERTS
(TIP=SEND, RING=RETURN)
3 2 1 4
MONITOR
(MONO)
PHONES MONITOR
L
R
L
R
23/24 21/22
(MONO)
(BAL/UNBAL) (BAL/UNBAL)
REVISION SERIAL NUMBER
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR
MOISTURE. DO NOT REMOVE COVER. NO USER SERVICEABLE
PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR
LEVEL
OUTPUT
O O +6
3
14
20
2
13
1
16 11
17 12
22 7 7 9 18
21 19
4 15
5
10 8 8 8 6