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1. For additional connection information, refer to the
owner’s manual(s) for any component(s) connect-
ed to the MX121 A/V Control Center.
2. The Main AC Power going to the MX121 and
any other McIntosh Component(s) should not
be applied until all the system components are
connected together. Failure to do so could result
in malfunctioning of some or all of the system’s
normal operations. When the MX121 and other
McIntosh Components are in their Standby Power
Off Mode, the Microprocessor’s Circuitry inside
each component is active and communication is
occurring between them.
3. Sound Intensity is measured in units called Deci-
bels and “dB” is the abbreviation.
4. LFE (Low Frequency Effects) refers to the Dolby
Digital or DTS sound channel dedicated to sound
effects (such as explosions) and is usually repro-
duced by the Subwoofer.
5. When discarding the unit, comply with local rules
or regulations. Batteries should never be
thrown away or incinerated but disposed
of in accordance with the local regula-
tions concerning battery disposal.
6. For additional information on the
MX121 and other McIntosh Products please visit
the McIntosh Web Site at www.mcintoshlabs.com.
7. The Main Zone accepts Audio Input Signals from
the HDMI, iPod/USB, Coaxial/Optical Digital
and unbalanced/balanced Analog Input Connec-
tions.
8. The Zones 2 and 3 accept Audio Input Signals
from the iPod/USB, Coaxial/Optical PCM Digital
Signals and unbalanced/balanced Analog Input
Connections.
Note: When connecting source devices with HDMI
Outputs to the MX121, make sure to also con-
General Information
nect the unbalanced/balanced Analog Output
or Coaxial/Optical Digital Audio Output for
each HDMI Source connected to MX121.
9. The Main Zone accepts Video Input Signals from
the HDMI, Component Video and Composite
Video Input Connections.
10. Zone 2 accepts Video Input Signals from the
Component Video and Composite Video Input
Connections.
11. Zone 3 is for Audio Signal Sources only.
12. MX121 is a three Zone Product (Main Zone, Zone
2 and Zone 3). This allows two different Audio/
Video Sources to be available simultaneously
for two separate rooms. Zone 2 may be used to
provide an Audio/Video Output Signal for record-
ing purposes, instead of an A/V signal to a second
room. The Zone 3 allows for listening to a differ-
ent Audio Source from either the Main Zone or
Zone 2. For more information contact your McIn-
tosh Dealer or McIntosh Technical Support.
13. The IR Input with 1/8 inch mini phone jack is
compatible IR sensors such as a Xantech Model
HL85BK Kit. Use a Connection Block such as a
Xantech Model ZC21 when two or more IR sen-
sors need to be connected to the MX121. To avoid
possible interaction, disable the MX121 Front
Panel Sensor. Refer to “IR Sensor" on page 27.
14. Setup Mode operations should be performed in
the order they appear in the first Setup Menu
presented, as they are interactive.
15. To hear bass frequencies below 80Hz, your system
must include either a Subwoofer or Large Front
Loudspeakers.
16. The MX121 has built-in HDMI Digital Video
Selection and Digital Video Processing Circuitry
with scaling capabilities to convert Composite or
Component Video Signals to Digital Video.
General Information
17. When there is a connection between the HDMI
Output and a TV/Monitor, the On-Screen Over-
lays including Menus, will only appear on the
HDMI Output.
18. HDMI Cable lengths between source components
and the MX121 also between the MX121 and the
TV/Monitor, should not exceed 25ft (8.3m). If
there is need to use HDMI Cables longer than 25ft
(8.3m) a high quality in line HDMI Buffer/Con-
verter would be required for reliable digital signal
transmission via the HDMI Connections.
19. The MX121 is designed to pass through a 3D
Digital Video Signal from a source component
to a 3D TV/Monitor via the HDMI Connections.
It is extremely important the HDMI cables used
for connections meet or exceed the HDMI High
Speed Cable Standards (1.4a) for proper 3D Video
Playback.
20. The Remote Control Supplied with the MX121
A/V Control Center is capable of operating other
components. For additional information go to
www.mcintoshlabs.com.
21. The MX121 is compatible with the following
Apple Mobile Devices with the latest version of
the Apple OS Software installed:
iPod touch (4th generation) iPhone 4S
iPod touch (3rd generation) iPhone 4
iPod touch (2nd generation) iPhone 3GS
iPod touch (1st generation) iPhone 3G
iPod classic iPhone
iPod nano (6th generation)
iPod nano (5th generation)
iPod nano (4th generation)
iPod nano (3rd generation)
22. The listing of "Last.fm" in the "MANUAL SET-
UP ► NETWORK SETUP" On-Screen Display
is no longer active as "Last.fm" has closed service
at the end of March 2014.