Bus Features; Mic Ins; Rear Panel Connections - Mackie 3204VLZ4 Quick User Manual

VLZ4 4~Bus Features
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19
Rear Panel Connections
• 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 preanips feature higher
fidelity and headroom rivaling any slanrlalone mic
precimp on the market today. These circuits are
cxccllent at rejecting hum and noise.
The XIJR inputs are wired as follows:
Pin I
=
Shield or ground
Pin 2
=
Positive
+
or hot
Pin 3
=
Negative or cold)
Professional ribbon, dynamic, and c nd nser mica all
sound excellent through these inputs. The midline
inputs will handle any kind of level you can toss at
them, without overloading.
Microphone-level signals are passed through thc
mixer's splendid microphone preamplifiers to become
line-level signals.
The Onyx prealflps 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.
Phantom Power
Most modern professional condenser mnics require
48V phantom power. ~hich lets the mixer send
lots-current DC voltage to the mic's electronics
through the same wires that carry audio. (Semi-pro
condenser mics often have h ~tteries to accomplish the
same thing.) "Phantom" owes its name to an ability to
he 'unseen" by dynamic mics (Shure SM571SM58, for
instance), which don't need external power and arent
affected by il anyway.
Phantom power may he selected by pressing up on the
mixer's phantom [211 switch
~ Never plug single ended (unbalanced)
-
microphones, or ribb n mics into the mic
input jacks if phantom power is on. Do not
plug instrument outputs into the mic XLR input jacks
with i hantom 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 inic preainps, and can be driven by
balanced or unbalanced sources.
To connect balanced lines to these inputs, use a V4'
Tip-Ring-Sleeve (TRS) plug, wirerl 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
n
—.
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Owner's Manual
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