McIntosh MX123 Home Theatre A/V Processor


The MX123 A/V processor connects all your home theater audio and video components, is easy to use, and produces premium quality surround sound for an enveloping home theater experience.

It is compatible with all the leading home theater surround sound and object-based 3D audio formats including Dolby® Atmos, DTS:X™ and Auro-3D®.
It’s also fully compatible with modern 4K Ultra HD video sources and can upscale lower resolutions to 4K Ultra HD for the best possible picture quality.

Streaming options*1 on the MX123 now include Apple® AirPlay 2® along with Bluetooth® and Spotify Connect for easy streaming from your mobile devices.

*1  All services may not be available in all regions; certain services may not yet be enabled for all apps; subscriptions may be required.



  • Multi-Channel Outputs Balanced:  13.2
  • Multi-Channel Inputs Unbalanced:  7.1
  • Multi-Channel Outputs Unbalanced:  15.2
  • Stereo Inputs Balanced:  1
  • Stereo Inputs Unbalanced:  8 (including 1 Moving Magnet Phono)
  • Stereo Outputs Unbalanced:  2
  • Digital Coaxial Input:  2
  • Digital Coaxial Output:  0
  • Digital Optical Input:  2
  • AES/EBU Balanced Input:  0
  • HDMI Input:  7 HDCP 2.2/2.3, High Dynamic Range (Dolby Vision, HDR10 and HLG), 4K Ultra HD at 50/60Hz, 4:4:4 color, Rec. 2020, 3D video pass-through
  • HDMI Output:  3 HDCP 2.2/2.3, High Dynamic Range (Dolby Vision, HDR10 and HLG), 4K Ultra HD at 50/60Hz, 4:4:4 color, Rec. 2020, 3D video pass-through, (1) eARC
  • HDBT Output:  0
  • USB:  1 Type A
  • Component Input:  3
  • Component Output:  1
  • Composite Input:  4
  • Composite Output:  2
  • Subwoofer 2 Output:  Yes (discrete signal from subwoofer 1)
  • Network Connection:  1
  • Max # Of Audio Channels In Zone A:  15
  • Additional Zone Outputs:  Zone 2: HDMI audio/video, component video, composite video, analog stereo audio;  Zone 3: Analog stereo audio
  • Advanced Connections:  Ethernet Web interface and firmware update, IP-based control, Web Data Streaming, Apple AirPlay 2, Bluetooth, Spotify Connect


  • Total Harmonic Distortion (DSP Bypass):  0.005%
  • Dolby Processing:  Atmos/True HD/Digital Plus&EX/Pro Logic IIz, IIx
  • DTS Processing:  DTS:X/Virtual:X/HD Master & High Res. Audio/ES/96/24, Discrete & Matrix6.1/Neo:6/Express/Neural-X
  • Auro Processing:  Auro 3D, Auro-Matic, Auro 9.1, 10.1
  • Pure Stereo DSP Bypass Mode:  Yes
  • Video Scaling:  4K Upconversion
  • High Dynamic Range (HDR):  Dolby Vision, HDR10 and HLG


  • Third Party Control:  RS232, Web IP, IR Input
  • Tone Controls:  9 Band Equalizer, Bass and Treble
  • OSD Overlay On HDMI Output:  Yes
  • Input-Output Format Indicators:  9 in and 9 out
  • Control Of McIntosh Sources:  Yes, by handheld remote, 1 Data Out, 2 Power Control Trigger jacks


  • Channel Formats:  13.2, 7.1, 5.1, Stereo
  • DSP Room Correction:  Audyssey MultEQ XT32, Dynamic EQ / Dynamic Volume, DSX
  • Microphone And Stand Included:  Yes
  • Network Features:  Wi-Fi dual band 2.4/5GHz, Apple AirPlay 2, Bluetooth, Spotify Connect
  • Unique Crossover Frequency, Each Speaker:  Yes
  • Special Features:  IMAX Enhanced, Rear Panel USB-Apple Dock, HDMI in standby, Apple AirPlay 2, Bluetooth, Spotify Connect
  • Dimensions (W x H x D):  444.5 x 193.7 x 495.3 mm (including feet front panel, knobs, rear panel connections and USB drive)
Additional Information
Weight 14 kg
Dimensions (DxWxH) 495.3 × 444.5 × 193.7 mm