HDMI Multi-Channel Digital to Two-Channel Analog Audio Converter

Model Number: AT-HD-M2C

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

HDMI Multichannel to Two-Channel Converter

HDMI Multichannel to Two-Channel Converter

Comprehensive Audio Signal Format Conversion & Compatibility

Audio signals come in many formats, yet many displays and legacy receivers have limited audio capabilties. 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, Dolby Atmos®, DTS-HD Master Audio™, and DTS:X™ to two channels.

The M2C is designed to integrate seamlessly with all Atlona HDMI switchers including the H2H, PRO2HD, PRO3HD, and UHD-PRO3 Series, as well as many other matrix switchers available.


Sharing common sources in mixed two-channel and multi-channel zones results in a degraded home theater audio experience. The multichannel zone, a 5.1 home theater for example, is forced to accept the compatible low performance audio stream required for a two-channel 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 two-channel audio in the kitchen or bedroom.

Atlona Advantage

  • 7.1/5.1 multi-channel to two-channel audio conversion and down-mixing to all outputs
  • Comprehensive audio format signal compatibility:  Dolby® Digital, Dolby® Digital Plus, Dolby® TrueHD, Dolby Atmos®, DTS Digital Surround™, DTS-HD Master Audio™, and DTS:X™
  • Atlona’s Intelligent EDID Management guarantees the best audio performance
  • Digital Coaxial and Optical plus analog stereo audio outputs for connection to legacy AVRs and systems without HDMI support
  • Plug and play functionality and simplicity eliminates the need for any setup, programming or configuration
  • Reduces system complexity and costs by eliminating the 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 

Optional Upgrade: HD-M2C Multi-channel HDMI output 

Firmware version 2.1.0 modifies the standard HD-M2C HDMI output behavior from two-channel 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 two-channel analog signal to a multi-zone audio amplifier simultaneously.

Note: Win8 and Win10 machines cannot be used for the firmware update, please use WinXP/Vista/7″


AT-HD-M2C features

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 800×600@60/75Hz, 1024×768@60/75Hz, 1280×768@60/75Hz, 1280×800@60Hz, 1280×1024@60/75Hz, 1366×768@60Hz, 1440×900@60/75Hz, 1440×1050@60Hz, 1600×900@60Hz, 1600×1200@60Hz, 1680×1050@60Hz, 1920×1200@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, Dolby Atmos, DTS:X
Total Harmonic Distortion 0.0025% (-92dB, sample frequency: 48kHz)
Sample Rate 44.1kHz, 48kHz, 96kHz, 192kHz
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
Supply Input: AC100~240V 50/60Hz Output: DC 5V/2.6A
H x W x D 30 x 125.11 x 110 (mm) 1.18 x 4.92 x 4.33 (inch)
Unit 0.26kg 0.57lbs
Shipping 0.67kg 1.48lbs
Unit CE, FCC, cULus
HDMI IN Features 3D, 1080p, 1920×1200, Dolby TrueHD, DTS-HD Master Audio
HDMI OUT Features 3D, 1080p, 1920×1200, 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




pdf-icon Manual
pdf-icon DataSheet

Diagrams, Drawings & CAD Files

cad-icon-(1) CAD Files


pdf-icon FAQ

Declarations Of Conformity

pdf-icon Declarations Of Conformity

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AT-HD-M2C Firmware

Download Firmware version 2.0.7 Download Firmware version 2.1.0
File Size 181 KB File Size 181 KB
Date 10.07.14 Date 06.27.14
Update 2.0.7 Includes: 
• Fixed compatibility with Dune HD and other HD products 
Update 2.1.0 Includes 
• Modifies HDMI output behavior to multi-channel audio 

Note: Win8 and Win10 machines cannot be used for the firmware update, please use WinXP/Vista/7″