8
Connections on the Back
The Inputs
Seven HDMI Inputs (six 4K, one 8K)
One pair balanced XLR Inputs (AES/EBU)
Eight pairs RCA analog stereo Inputs including one
MM (moving magnet) RCA stereo pair and ground
connection
Two coaxial digital audio Inputs
Two Toslink optical Inputs
Four RCA video Inputs
Three sets of three component video RCA jacks
One 7.1 CH Input with eight analog RCA jacks
One USB port to supply power
One USB port to connect storage
One 10baseT LAN connector
Figure 03– MX123 Rear View
One 1/8 inch jack for microphone Input
One 1/8 inch jack for RS232 connector
One 1/8 inch jack for wired IR Input
One AC power connector
The Outputs
Three HDMI Outputs (Two MON 8K, ZONE 2 4K)
15 balanced XLR audio Outputs
17 unbalanced RCA Outputs
Two 1/8 inch jack Power Control (trigger) Outputs
Two RCA stereo pairs Output to two additional
zones
One set of three component video RCA Outputs
Two RCA video Outputs
One 1/8 inch Data Output jack
Making Connections
• Do not plug in the power cord until
all connections have been completed.
Bluetooth/Wi-Fi Antenna
Attach the two Bluetooth/Wi-Fi antennas that
are included in the MX123 accessory package.
Each antenna screws into a connector labeled
BLUETOOTH/WI-FI ANT located in the top right
and left corners of the rear panel. After attaching the
antennas, point them upward.
10baseT LAN
Use an Ethernet cable to connect the MX123 to a
network router. The network connector is located
on the top left rear of the MX123. It is labeled
NETWORK. By default, the MX123 has DHCP set
to ON and will automatically receive an IP address
from the router. This setting can be changed. (See
“Network” on page 24.)
3 (BLU-RAY)
4 (GAME)
5 (MEDIA PLAYER)
6 (CD)
ZONE 2 (4K)
MON 1 (8K)
2 (DVD)
Y
PB
PR
Y
FR
SUB
SR
SBR
HDMI IN
VIDEO
IN 2 (DVD)
IN 3 (BLU-RAY)
PB
PR
Y
PB
PR
XLR BALANCED INPUT
R
L
FR
FL
C
SW1
SR
SL
SBR
SBL
BALANCED OUTPUTS
SW2
1 (CBL/SAT)
2 (DVD)
3 (BR)
4 (GAME)
Z2 OUT
MON OUT
IN 1 (CBL/SAT)
COMPONENT VIDEO
MONITOR OUT
ANALOG AUDIO OUT
ZONE 2
ZONE 3
L
R
FR
SW1
SR
SBR
SW2
HR1
HR2
FL
C
SL
SBL
7.1 CH INPUT
UNBALANCED PRE OUT
FL
C
SL
SBL
HL1
HL2
TUNER
CBL/SAT
DVD
BLU-RAY
GAME
ANALOG AUDIO IN
L
R
PHONO
HR1
HL1
HR2
HL2
GND
2
(CD)
OPT
A/V PROCESSOR
MX123
MCINTOSH LABORATORY, INC.,
BINGHAMTON, NY
HANDCRAFTED IN USA WITH US AND IMPORTED PARTS
HR3
HL3
1 (CBL/SAT)
7 (AUX 8K)
ARC
COAX
1
(TV AUDIO)
RS232
TRIG 1
IR IN
DATA
OUT
SETUP
MIC
TRIG 2
CD
MP
HDMI OUT
MON 2 (8K)
1
2
3
4
5
6
CAN ICES-3(B)/NMB-3(B)
1
2
HL4/WIDE
HR4/WIDE
HR3
HL3
DIGITAL AUDIO IN
(CBL/SAT)
(DVD)
NETWORK
POWER SUPPLY
5V/1.5A
USB
5V/1A
BLUETOOTH
/ Wi-Fi ANT
BLUETOOTH
/ Wi-Fi ANT
SERIAL
NUMBER
75 WATTS
120V
50 60Hz
FOR INDOOR
USE ONLY
eARC