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Atlona HDMI Multichannel to 2CH Converter

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Model Number: AT-HD-M2C

The Atlona HD-M2C is the ideal audio signal conversion solution for whole-home AV systems where matrix switching is core. Content from multichannel sources such as Blu-ray players, set-top boxes (STB) and game consoles can be distributed to multichannel and 2-channel capable zones simultaneously, ensuring compatibility, reducing system complexity and eliminating the expense of separate dedicated sources for each zone.


  •   Overview
  •   Specifications
  •   Documentation
  •   FAQ
  •   Firmware

Comprehensive Audio Signal Format Conversion & Compatibility

Today’s audio signals come in many formats, yet many displays and legacy receivers are limited to what they can receive and output. The Atlona HD-M2C is engineered to be compatible with virtually all digital audio formats including lossless and lossy (compressed/uncompressed) formats.

With its plug and play capabilities, requiring no programming, the M2C is unique to the market and perfect for any residential system. The HD-M2C is a true powerhouse in a small package that converts/down-mixes multichannel HD audio formats like Dolby® Digital Plus, Dolby® TrueHD, DTS-HD Master Audio™ to 2 channels.

The M2C is designed to integrate seamlessly with all Atlona HDMI switchers including the H2H, PRO2HD, PRO3HD series, as well as many other matrix switchers available.


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Sharing common sources in mixed 2ch and multi-channel zones results in a degraded home theater audio experience. The multichannel zone, HD 5.1 home theater for example, is forced to accept the compatible low performance audio stream required for a 2ch zone such as a flat panel TV.

The HD-M2C solves this dilemma by allowing the distribution of full audio to each zone and seamlessly down mixing from sources such as lossless HD audio. No audio compromises required, enjoy the best HD audio for your home theater and simultaneously enjoy 2ch audio in the kitchen or bedroom.

Atlona Advantage

  • 7.1/5.1 multi-channel to 2-channel audio conversion and down-mixing to all outputs
  • Comprehensive audio format signal compatibility (Dolby® Digital, Dolby® Digital Plus, Dolby® TrueHD, DTS Digital Surround™ & DTS-HD Master Audio™)
  • Atlona’s Intelligent EDID Management guarantees the best audio performance
  • (Digital) Coaxial / Optical and analog stereo audio outputs for connection to legacy AVRs and systems without HDMI support
  • Plug & Play functionality and simplicity eliminates the need for any setup, programming or configuration
  • Reduces system complexity and costs, eliminates need for separate, dedicated sources for each zone
  • Fully HDCP compliant allowing any protected content to be transmitted
  • LED status indicators automatically detect and display incoming digital audio signal format type
  • Mini USB port for easy firmware updates
  • CEC pass through support

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Optional Upgrade: HD-M2C Multi-channel HDMI output
Firmware version 2.1.0 modifies the standard HD-M2C HDMI output behavior from 2ch down mix to multi-channel pass through. A Blu-Ray player 7.1 DTS HD-Master Audio stream will simply output the HD-M2C completely intact. This allows a multi-channel signal to be transmitted to an AVR and a 2ch analog signal to a multi-zone audio amplifier simultaneously!


  Video 480i@60Hz, 480p@59.94/60Hz, 576i@50Hz, 576p@50Hz, 720p@50/59.94/60Hz, 1080i@50/59.94/60Hz, 1080p@23.98/24/25/29.97/30/50/59.94/60Hz
  VESA 800x600@60/75Hz, 1024x768@60/75Hz, 1280x768@60/75Hz, 1280x800@60Hz, 1280x1024@60/75Hz, 1366x768@60Hz, 1440x900@60/75Hz, 1440x1050@60Hz, 1600x900@60Hz, 1600x1200@60Hz, 1680x1050@60Hz, 1920x1200@60Hz
  Colorspace RGB, YCbCr 4:4:4, YCbCr 4:2:2
  Color depth 8-bit, 10-bit, 12-bit
  Formats PCM 2Ch, LPCM 5.1, LPCM 7.1, Dolby Digital, DTS 5.1, Dolby Digital Plus, Dolby TrueHD, DTS-HD Master Audio
  Sample Rate 44.1kHz, 48kHz, 96kHz, 192kHz
  Total Harmonic Distortion 0.0025% (-92dB, sample frequency: 48kHz)
  Signal/Noise Ratio 106dB
  Gain 0
  Frequency Range 20Hz to 20kHz
  HDMI up to 10 meters up to 30 feet
  Bandwidth 6.75 Gbps
  CEC Pass through
  HDCP Compliant
  Operating 0°C to 40°C 32°F to 104°F
  Storage -20°C to 60°C -4°F to 140°F
  Humidity 20 to 90% non-condensing
  Consumption 2.6W
  Supply Input: AC100~240V 50/60Hz
Output: DC 5V/2.6A
  H x W x D 43.66 x 138.11 x 105.70 (mm) 1.72 x 5.44 x 4.16 (inch)
  Device 0.26kg 0.57lbs
  Shipping 0.67kg 1.48lbs
  Power Supply CE, FCC, cULus


  Features 3D, 1080p, 1920x1200, Dolby TrueHD, DTS-HD Master Audio
  Features 3D, 1080p, 1920x1200, PCM 2Ch @ 48kHz (up to Dolby TrueHD/DTS-HD Master Audio using firmware V2.1.0)
  Optical OUT
  Audio PCM 2Ch @ 48kHz
  Coaxial OUT
  Audio PCM 2Ch @ 48kHz
  Analog OUT
  Audio 2Ch (L/R) @ 48kHz
  Mini USB
  Use Firmware updating

Package Contents

QTY   Item
1   AT-HD-M2C
1   Locking 5V DC Adaptor
1   User manual

 Declaration of

 CAD files

  Sometimes there is an audio delay when changing channels on my cable/satellite set top box, why is that?
  This audio delay occurs when there is an audio format change. An example would be if one channel was broadcasting a 2CH. PCM signal and was switched to another channel that is broadcasting a Dolby Digital signal. There will be a slight 1-2 second delay in audio to prevent any kind of audio distortion or popping.

  Does the AT-HD-M2C let me play Multi Channel through the HDMI and stereo through the other outputs?
  It depends on the firmware you have on your AT-HD-M2C. Only FW 2.1.0 and above support Multi Channel via HDMI output. See "Firmware Updates" tab to download the latest firmware.

  Can I use extenders to go into our come out of the AT-HD-M2C?
  It is possible to use extenders with this unit, we recommend using any HDBaseT extenders such as our AT-HD(TX/RX) family.

  Can the AT-HD-M2C be left on constantly?
  The AT-HD-M2C does not need to be powered off and can be permanently left on.

AT-HD-M2C Firmware

Download Firmware version 2.0.0 Download Firmware version 2.1.0
File Size 181 KB File Size 181 KB
Date 02.26.14 Date 06.27.14
Update 2.0.0 Includes:
      • Default Firmware
Update 2.1.0 Includes
      • Modifies HDMI output behavior to multi-channel audio