Heritage Audio MCM8 II User manual

MCM-8 II

PRELIMINARY USER GUIDE v1.0

© 2018 Heritage Audio S.L. is the solely owner of the copyright of all information and drawings contained
in this manual which are not to be copied or reproduced by any means or disclosed in part or whole to any third
party without written permission.

Heritage Audio reserves the right to alter specifications without notice. The information in this manual has
been carefully checked and is believed to be accurate at the time of publication. However, no responsibility is taken
by us for inaccuracies, errors or omissions nor any liability assumed for any loss or damage resulting either directly
or indirectly from use of the information contained within it.

MCM-8 II Iss2

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MCM8 II VS MCM8

In 2015, Heritage Audio set a new standard in 500 Series enclosures with the addition of the
OST technology. Further, we introduced the MCM8, a true transformer-based voltage
summing mixer for 500 Series modules.

Hundreds of units later, we have taken all our customer´s feedback and included it in the new
version, the MCM8 II.

The main differences in between this version and its predecessor are:

- Extra 500 series button per channel, allowing to bypass the 500 series module when
mixing if desired. It also allows for quick comparisons in between processed/
unprocessed signals. It also makes using the mixer with empty slots quite easier. Just
un pressing the 500 button allows for this type of operation.

- Significant lower noise: A highly innovative, new quasi-balanced voltage summing
topology sets the noise floor of the new MCM8 II touching the theoretical minimum.
No more hiss into your mixes!

INTRODUCTION

The MCM-8 II is an OSTTM 8 channel 500 Series Enclosure WITH mixer functions.

OST is a Heritage Audio proprietary technology which eliminates module’s interaction through
the power supply feeding each slot with independent supply stages.

The mixer follows a passive voltage summing topology, having the gain loss restored by a
classic ´73 type class A output stage.

Preliminary User Guide v2.0

MCM-8 II Iss2

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FRONT PANEL OVERVIEW

Upper row on the front panel is dedicated to the 8 mixer’s main inputs.

Controls per channel are as follows:

- ON: When pressed, the output of the slot is added to the mix bus. When depressed,
it’s muted.

- “500”: When pressed, the signal going to the mixer section is taken from the output of
the 500 series module, while when not pressed, it is taken from the input of the
enclosure. This allows bypassing the module when summing, or using the mixer with
an empty slot.

- FADER: Attenuates the signal sent to the mix bus from unity to minus infinity. Fader all
clockwise means unity gain, whilst 12 o’clock means an approximate 20 dB of
attenuation. (or -20dB of gain).

- PAN: Places the signal within the stereo spectrum, left, center, right or any
intermediate setting. The panoramic law follows a standard in which if a 0dB signal is
hard panned, it is -3dB when center panned.

Lower zone is dedicated to the 500 series modules. Any module following the API protocol
(both mechanically and electrically) will be compatible with the unit.

Right part of the unit is dedicated to the mixer’s center section, as follows:

- VU Meters: Measuring the average level at the master outputs.

- Master Fader: Attenuates the Mix’s output from unity to minus infinity. The control
has a stepped feel for easy recall of settings. Fader all clockwise means unity gain,
whilst 12 o’clock means an approximate 20dB of attenuation.

At the bottom right there are LEDs showing the correct status of the external power source.

Preliminary User Guide v2.0

MCM-8 II Iss2

4

BACK PANEL OVERVIEW

Upper row on the back panel corresponds to the individual XLR and combined DSUB channel
outputs.

Lower row corresponds to the individual XLR and combined DSUB channel inputs.

Both DSUB connectors are wired following the TASCAM protocol.

Stereo Mix output is located far left, on a pair of male XLR connectors.

Aux Inputs are located above the 8 inputs, on a pair of female XLR connectors. They´re
hardwired Left and Right and are unity gain.

External Power Supply connector is located on the bottom left corner.

Preliminary User Guide v2.0