Heritage Audio MCM-20.4 Summing Mixer

SKU: HAMCM204 MFR: HAMCM20.4
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Key Features

  • Achieve pristine audio clarity with this 20-channel Heritage Audio summing mixer.
  • Elevate your studio recordings with the MCM-20.4's exceptional signal processing.
  • Enjoy versatile connectivity via XLR and DB-25, perfect for any studio setup.
  • Experience superior sound quality; THD+N is not more than 0.07% for clean mixes.
  • Craft dynamic mixes with +27dBu max output, ideal for professional audio work.
  • Integrate this durable summing mixer for a lifetime of reliable signal processing.
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Special Order?Estimated to Ship: 08/19/2025
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Heritage Audio MCM-20.4 Summing Mixer Specifications

  • Channel Input Impedance

    > 20 Kohm

  • Maximum channel input level

    > +26dBu

  • Maximum insert return input level

    > +26dBu

  • Maximum insert send level

    > +27dBu, able to drive 600 ohm

  • Maximum aux send output level

    > +27dBu

  • Maximum main output level

    > +26dBu into 600ohm

  • Frequency response

    +/-0.5dB 20Hz to 20kHz

  • THD + N

    Not more than 0.07% from 50 Hz to 10 kHz at +20dBu output (22 Hz to 22 Khz bandwidth) into 600Ohm

  • Main Output measure 22Hz to 22Khz

    Better than -80dBu (Noise, all faders up, all subgroups in, measured at the main output)

  • UPC Code

    702877907221

About Heritage Audio MCM-20.4 Summing Mixer

The MCM-20.4 employs a unique configuration, offering 16 input channels arranged into 2 subgroups of 8, plus 4 more channels hard wired left and right in pairs. Each front channel features center detent Pan and Fader concentric controls plus balanced insert and mute switches.

4 auxiliary sends are provided; being AUX 1 &2 mono sends, while 3 is Stereo. Sends can be done Pre or Post Fader. Master send levels are provided as well.

The insert send points always have the signal present, so they can be alternatively used as direct outputs for recording without additional patch bays.

Each group has its own stereo fader and balanced insert point and all 4 stereo subgroups are passively summed into the master bus. The gain is restored by means of a 1073 style class A , transformer coupled, mic preamplifier, featuring a total of 4 transformers (2 each channel).

The master section is also provided with its own balanced insert point.

All connections on the back are made by DSUB 25 connectors following the Tascam protocol, with the exception of the master bus connections, which are by dedicated XLRs.

Vintage Sound Quality and Low Noice
The smart summing topology employed in the MCM series of mixers allows for an impressive headroom and surprising low noise figure for a 20 channel, vintage topology mixer. Special care has been taken on improving crosstalk and self-noise figures from those on the vintage designs in order to accommodate the new MCM mixers into the digital era.

The transformer based class A output stage is able to deliver a full +26dBu output.

Designed for situations where less track counts are enough, but added flexibility is needed. Its 4 auxiliary sends allows cue mixes, analog reverb and fx sends, parallel compression, etc, all in the analog domain. It also has balanced points on every input and output for outboard gear integration. 4 transformers and a class A output stage ensures a correct vintage sound.

Heritage Audio MCM-20.4 Summing Mixer Features

  • Channel Fader (From -inf. to unity)
  • Channel Mute & Insert Send
  • Subgroup Master Fader (Subgroup master section with MUTE and balanced INSERT)
  • Master VU
  • Channel Pan
  • Send PRE (sends the Aux pre or post fader)
  • Aux Level (From -inf. to unity)
  • Master Fader (Masters section with MUTE and balanced INSERT)
  • 3ST (Switches from aux 1-2 to 3ST)
  • Auxes Master Level (From -inf. to unity)
  • Master Insert send and Return (Balanced +4 on XLRs)
  • Channel Inputs
  • Insert Returns (Balanced +4 DSUB 25)
  • Main Outputs (Mix and Monitor o/ps on XLRs)
  • PSU Input
  • Subgroup Insert sends and Returns & Aux Inputs (All balanced +4 DSUB 25)
  • Insert Sends (Balanced +4 on DSUB 25)

Product Documents

User Manual

Key Features

  • Achieve pristine audio clarity with this 20-channel Heritage Audio summing mixer.
  • Elevate your studio recordings with the MCM-20.4's exceptional signal processing.
  • Enjoy versatile connectivity via XLR and DB-25, perfect for any studio setup.
  • Experience superior sound quality; THD+N is not more than 0.07% for clean mixes.
  • Craft dynamic mixes with +27dBu max output, ideal for professional audio work.
  • Integrate this durable summing mixer for a lifetime of reliable signal processing.