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Studio & Recording

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Heritage Audio MCM-20.4 Analog 20-Channel Summing Mixer
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The Heritage Audio MCM-20.4 is an analog 20-channel summing mixer designed to provide high-quality passive line level signal summing and coloration for mixing engineers in home, project, and commercial studios. It sums up to 16 channel inputs and four aux inputs sourced from DB25 connectors to a stereo master output where gain restoration is performed by a Class-A, 1073-style microphone preamp with four transformers.

Each bank of eight inputs is fed to a stereo subgroup and then to the main stereo out. Insert sends and returns are present for each input channel and subgroup via DB25 connectors and for the stereo master bus via XLR jacks. Each channel offers level and pan controls, mute, one stereo and two mono aux sends, and insert return selection. The stereo master and each stereo subgroup offers level, mute, and insert functionality.

Dedicated XLR 3-pin mix and monitor output jacks enable simultaneous connection to a mixdown recorder and monitoring system. Easily keep an eye on your stereo bus levels via stereo VU meters.

16 channel inputs and four aux inputs via DB25 connectors
Balanced inserts for all input channels, four subgroups (two stereo pairs), and stereo master bus
DB25 channel and subgroup inserts
XLR master inserts
Dedicated XLR 3-pin mix and monitor outputs
Per-channel volume and pan knobs
Per-channel mute and insert return switches
Volume control, mute switch, and insert return selector for each stereo subgroup and stereo master
Stereo VU meters calibrated for 0 VU = +8 dBu

Technical Specifications

Type Analog
Inputs 2 x DB25 analog 8-channel inputs
Outputs 2 x XLR 3-pin male (mix outputs, stereo pair)
2 x XLR 3-pin male (monitor output, stereo pair)
Inserts 2 x DB25 analog 8-channel insert sends
2 x DB25 analog 8-channel insert returns
1 x DB25 analog subgroup insert sends and aux sends
1 x DB25 analog subgroup insert returns and aux inputs
2 x XLR 3-pin male insert sends (master, stereo pair)
2 x XLR 3-pin female insert returns (master, stereo pair)
On-Board Processors None
Gain Control Per-channel knobs
Master fader knob
Gain Range Unity gain to minus infinity
Impedance Channel Input: > 20 kOhms
Maximum Input Level Channel Input: > +26 dBu
Insert Return: > +26 dBu
Maximum Output Level Main Output: > +26 dBu into 600 Ohms
Insert Send: > +27 dBu, able to drive 600 Ohms
Frequency Response 20 Hz to 20 kHz (±0.5 dB)
THD + N Not more than 0.07% from 50 Hz to 10 kHz at +20 dBu output (22 Hz to 22 kHz bandwidth) into 600 Ohms
Noise Better than -80 dBu (22 Hz to 22 kHz, all faders up, all subgroups in, measured at main output)
Power Requirement HA-PSU02 external power supply via XLR 5-pin jack
Dimensions (W x H x D) 19 x 7 x 9" / 482.6 x 177.8 x 228.6 mm
Weight 14 lb / 6.4 kg
Specialties Stereo VU meters (0 VU = +8 dBu)

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