MX121 A/V Control Center

The MX121 home theater processor is the control hub of some of the finest home theater systems in the world. An extensive yet easy to use feature set allows MX121 based systems to be configured to meet your exact needs.

All current and legacy audio and video sources – such as Blu-ray, DVD, CD and Laser Disc players along with turntables and tuners – may be controlled, processed and operated through the MX121. A vast array of inputs, including six HDMI that support 1080P resolution and 3D video pass-through, ensures you’ll be able to connect all your source components. The 3D video pass-through will allow you to enjoy everything current 3D Blu-ray discs™ and broadcasts have to offer. And with built in Dolby® TrueHD and DTS-HD Master Audio™ decoding, you’ll hear – and feel – everything too.

The MX121 outputs a discrete signal to each of your speakers, whether you have a traditional 5.1 home theater setup or a newer 7.1 configuration. Provisions for Front Height or Width channels are also offered, depending upon your listening preference. Up to two additional zones are available for expansion into other listening areas of your home, with independent source selection and volume adjustment in each area.

Home network communication is supported so you can stream audio and photos directly from your computer or the internet, including Pandora® radio. Built in AirPlay® allows you to wirelessly stream music via your Wi-Fi network* from your Mac or PC based iTunes® library, as well as music stored on your iPad,® iPhone® or iPod touch.® Utilizing a USB cable, iPod classic and select iPod nanos can also be connected; you can also connect your iPhone or iPod touch for charging. (see Specifications for complete list of compatible Apple devices).

Audyssey MultEQ® XT will calibrate your MX121 to compensate for your home theater’s unique acoustical properties, delivering the clearest and most balanced sound possible. For easy system startup and shutdown, the MX121 has the ability to automatically turn McIntosh source components and amplifiers on and off.

*AirPlay requires iTunes 10.1 or later and iPhone, iPad or iPod touch with iOS 4.3.3 or later. To wirelessly stream music to the MX121, a wireless router is required. Router not included.

“Made for iPod” and “Made for iPhone” mean that an electronic accessory has been designed to connect specifically to iPod or iPhone respectively, and has been certified by the developer to meet Apple performance standards. Apple is not responsible for the operation of this device or its compliance with safety and regulatory standards. Please note that the use of this accessory with iPod, or iPhone, may affect wireless performance.

AirPlay, the AirPlay logo, iPad, iPhone, iPod, iPod classic, iPod nano, iPod shuffle, and iPod touch are trademarks of Apple Inc., registered in the U.S. and other countries. iPad is a trademark of Apple Inc.

Individual users are permitted to use iPhone, iPod, iPod classic, iPod nano, iPod shuffle, and iPod touch for private copy and playback of non-copyrighted contents and contents whose copy and playback is permitted by law. Copyright infringement is prohibited by law.

Non-McIntosh-Provided Services: Embedded and/or non-embedded services, e.g. those listed above, are necessary for full functionality, are provided by companies unrelated to McIntosh, and are beyond McIntosh’s control. McIntosh cannot and does not warrant against interruption, discontinuance, unsatisfactory performance, reduced Product functionality, or damages of any kind attributable to such services or their providers.

Dolby is a registered trademark of Dolby Laboratories.

DTS, DTS-HD, the Symbol, & DTS or DTS-HD and the Symbol together are registered trademarks of DTS, Inc. © DTS, Inc. All Rights Reserved.

Pandora is a registered trademark of Pandora Media, Inc.

Audyssey MultEQ® XT, Audyssey Dynamic Volume® and Audyssey Dynamic EQ® are a registered trademarks of Audyssey Laboratories, Inc.



Multi-Channel Outputs Balanced

(6th & 7th channels can be SBL & SBR or FHL & FHR or FWL & FWR)

Multi-Channel Inputs Unbalanced


Multi-Channel Outputs Unbalanced

plus connection for 2nd duplicate subwoofer
(only 7.1 speaker channels can be used at one time; 6th & 7th channels can be SBL & SBR or FHL & FHR or FWL & FWR)

Stereo Inputs Balanced


Stereo Inputs Unbalanced

(including Moving Magnet Phono)

Stereo Outputs Unbalanced


Digital Coaxial Input


Digital Coaxial Output


Digital Optical Input


Digital Optical Output


AES/EBU Balanced Input


HDMI Input

3D Video Pass-Through, ARC, CEC, Deep Color, x.v.Color, Auto Lip Sync, Advanced HD Audio

HDMI Output

(both for Zone A, 1 with and 1 without ARC, only 1 active at a time - ideal for flat screen and large projector in same room) 3D Video Pass-Through, CEC, Deep Color, x.v.Color, Auto Lip-sync

HDBT Output



1 Type A

Component Input


Component Output


Composite Input


Composite Output


S-Video Input


S-Video Output


Subwoofer 2 Output

(duplicate signal of subwoofer 1)

Network Connection


Max # of audio channels in Zone A


Additional Zone Outputs

Zone B: Analog stereo audio and component video
Zone C: Analog stereo audio

Advanced Connections

Ethernet Web interface and firmware update, IP-based control, Web Data Streaming, Apple AirPlay


Total Harmonic Distortion (DSP Bypass)


Dolby Processing

True HD/Digital Plus&EX/Pro Logic IIz, IIx

DTS Processing

HD Master & High Res. Audio/ES/96/24, Discrete & Matrix6.1/Neo:6/Express/Neural

Auro Processing


Pure Stereo DSP Bypass Mode


Video Scaling

Yes, up to 1080P HDMI


Third Party Control

RS232, Web IP, Serial Data input, IR input port

Tone Controls

9 Band Equalizer, Bass and Treble

OSD Overlay on HDMI Output


Input-Output Format Indicators

9 in and 9 out

Control of McIntosh Sources

Yes, by handheld MX121 remote, 1 Data Out, 2 Power Control Trigger jacks

General Specifications

Channel Formats

Stereo, 5.1, 7.1, Two Mono Subwoofers

DSP Room Correction

Audyssey MultEQ XT, Dynamic EQ / Dynamic Volume, DSX

Microphone and stand included


Network Features

DLNA 1.5 Certified, Pandora, Internet Radio, Flickr, AirPlay, vTuner

Unique Crossover Frequency, Each Speaker


Special Features

Rear Panel USB-Apple Dock, HDMI in standby, Apple AirPlay

Weights & Dimensions

Dimensions (W x H x D)

17-1/2" (44.45cm) x 7-5/8" (19.37cm) (including feet) x 19-1/2" (49.53cm) (including front panel, knobs, rear panel connections and USB drive)


30 lbs (13.6 kg)

Shipping Weight

54 lbs (24.5 kg)

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