14
PATCHBAY
This is where everything gets plugged in: microphones, line-level instruments, effects devices,
headphones and the ultimate destination(s): PA system, tape recorder, etc.
1. MIC
The mono channels are equipped with
Mackie’s cutting-edge XDR
TM
microphone
preamplifiers; providing up to 60dB of rugged,
low-noise, crystal-clear, phantom-powered am-
plification. Their balanced circuitry rejects all
manner of extraneous interference. Profes-
sional condenser, dynamic and ribbon mics will
all sound excellent through these XLR inputs.
The inputs will accept almost any kind of
balanced mic that has a standard XLR-type
male mic connector.
XLR balanced wiring:
Pin 1 = shield
Pin 2 = hot (+)
Pin 3 = cold (-)
INSERT
INSERT
INSERT
INSERT
INSERT
INSERT
INSERT
MIC 20
TAPE OUT
TAPE IN
TALK BACK
MIC
R
R
R
(MONO)
4
L
L
L
3
2
1
L
CONTROL ROOM OUT
MAIN INSERTS
3
3
4
2
3
1
1
L
L
R
R
R
L
24
23
21
22
20
MIC 19
19
LINE IN
(BAL OR UNBAL)
LINE IN
(BAL OR UNBAL)
LINE IN
(BAL OR UNBAL)
LINE IN
(BAL OR UNBAL)
LINE IN
(BAL OR UNBAL)
LINE IN
(BAL OR UNBAL)
LINE IN
(BAL OR UNBAL)
MIC 18
18
MIC 17
17
MIC 16
16
MIC 15
15
MIC 14
14
RIGHT
MAIN OUT
LEFT
MAIN OUT
MONO
MAIN OUT
OUTPUT
LEVEL
PHONES
2
PHONES
1
OFF
POWER
ON
OFF
PHANTOM
ON
MONO
MONO
PIN 2 = HOT
PIN 3 = COLD
FUSE INSIDE
120VAC
50/60 HZ 60W
1A/250V SLO BLO
CAUTION:
TO REDUCE
THE RISK OF FIRE, REPLACE
WITH THE SAME TYPE FUSE
AND RATING
O
O
+6
MAIN
BALANCED
OUTPUTS
R
R
L
L
AUX SENDS
(BAL OR UNBAL)
STEREO AUX RETURNS
(BAL OR UNBAL)
SUB INSERTS
(BAL OR UNBAL)
6
2
5
1
4
R
R
L
R
L
7
8
6
5
SUB OUTS
(BAL OR UNBAL)
4
2
MAIN OUTS
(BAL OR UNBAL)
(BAL OR UNBAL)
XDR
MIC PRE
XDR
MIC PRE
XDR
MIC PRE
XDR
MIC PRE
XDR
MIC PRE
XDR
MIC PRE
XDR
MIC PRE
2. LINE IN
The line inputs share circuitry (but not
phantom power) with the mic preamps, and
can be driven by balanced or unbalanced
sources. These inputs can accept virtually any
line-level signal, from -45dB up to +20dB.
1/4” TS (Tip-Sleeve) unbalanced wiring:
Tip = hot (+)
Sleeve = shield
1/4” TRS (Tip-Ring-Sleeve) balanced wiring:
Tip = hot (+)
Ring = cold (-)
Sleeve = shield
2
2
3
1
1
SHIELD
COLD
HOT
SHIELD
COLD
HOT
3
SHIELD
COLD
HOT
3
2
1
SLEEVE
TIP
TIP
SLEEVE
TIP
SLEEVE
SLEEVE
TIP
SLEEVE
TIP
RING
RING
TIP
SLEEVE
RING
