MCM-20.4 PRELIMINARY USER GUIDE v1.1 © 2017 All the documentation included in this manual is copyrighted by Heritage Audio S.L. All rights are reserved. No part of this manual may be reproduced, copied, translated or transmitted, in any form or by any means without the prior written permission of Heritage Audio S.L. Heritage Audio S.L. reserves the right to make improvements to the products described in this manual at any time without notice.
MCM-20.4 Iss1 DESCRIPTION The MCM-20.4 is a 20 x 4 channel summing mixer. It employs a unique configuration, offering 20 input channels arranged as follows: 16 are implemented in 2 rows of 8 channels each, being the remaining 4 assigned to the master section, hard panned left and right in pairs. Unlike classic consoles employing a complicated switching matrix for subgroup assignment, the channels have a fixedassignment in groups of eight.
MCM-20.4 Iss1 FRONT PANEL OVERVIEW The front panel is laid out in 4 rows, 2 of 8 channels each featuring grey knobs and 2 with blue knobs carrying the aux sends sections. Further right are the related subgroup controls and aux sends master faders. Right side of the unit comprises the master section controls. Controls per channel are as follows: - - ON: When pressed, the related input is added to the subgroup bus. When depressed, it’s muted. INS: Turns the insert on.
- MCM-20.4 Iss1 FADER: Attenuates the signal sent to the Master bus 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 20 dB of attenuation. (or -20dB of gain ). Controls for the Master Aux send levels are as follows: - Master AUX 1 and 2 send level on a dual concentric control ( inner for 1, outer for 2 ) Master AUX 3 send level on a Stereo control.
MCM-20.4 Iss1 BACK PANEL OVERVIEW All the external connections are on the back panel, as follows: - 5 pin XLR for the external HA-PSU02 power supply unit. XLRs for Mix Output L and R. XLRs for Monitor Output L and R XLRs (2) for Master Insert Send L and R XLRs (2) for Master Insert Return L and R DSUB 25 for Subgroup 1-4 Insert sends and Aux sends DSUB 25 for Subgroups 1-4 Insert Returns and Auxiliary inputs.
MCM-20.4 Iss1 All DSUB 25 multi pin connectors are TASCAM protocol. This same protocol is also used by AVID* amongst many others, and is as follows: The list of the DSUB connectors used and their corresponding channels are as follows: CHANNEL INPUTS 1-8: TASCAM DSUB CHANNEL # 1 2 3 4 5 6 7 8 Preliminary User Guide v1.
MCM-20.4 Iss1 CHANNEL INPUTS 9-16: TASCAM DSUB CHANNEL # 1 2 3 4 5 6 7 8 CHANNEL I/P 9-16 INPUT #9 INPUT #10 INPUT #11 INPUT #12 INPUT #13 INPUT #14 INPUT #15 INPUT #16 INSERT SENDS 1-8: TASCAM DSUB CHANNEL # 1 2 3 4 5 6 7 8 INSERT SENDS 1-8 INSERT SEND INSERT SEND INSERT SEND INSERT SEND INSERT SEND INSERT SEND INSERT SEND INSERT SEND #1 #2 #3 #4 #5 #6 #7 #8 INSERT SENDS 9-16: TASCAM DSUB CHANNEL # 1 2 3 4 5 6 7 8 Preliminary User Guide v1.
MCM-20.
MCM-20.4 Iss1 SUBGROUP INSERT RETURNS 1-4 AND AUXILIARY INPUTS: TASCAM DSUB CHANNEL # 1 2 3 4 5 6 7 8 SUBGROUP INSERT RETURNS 1-4 AND AUX INPUTS SUBGROUP INSERT RETURN #1 SUBGROUP INSERT RETURN #2 SUBGROUP INSERT RETURN #3 SUBGROUP INSERT RETURN #4 AUXILIARY INPUT #1 (L) AUXILIARY INPUT #2 (R) AUXILIARY INPUT #3 (L) AUXILIARY INPUT #4 (R) It is worth noting that, in order to avoid ground loops, the Dsub ground connections are lifted on the MCM20.
MCM-20.4 Iss1 SIGNAL FLOW AND BLOCK DIAGRAM (Dsubs omitted for clarity) Preliminary User Guide v1.
MCM-20.4 Iss1 Preliminary User Guide v1.
MCM-20.4 Iss1 Preliminary User Guide v1.
MCM-20.4 Iss1 Preliminary User Guide v1.
MCM-20.4 Iss1 GAIN STRUCTURE The gain structure in the MCM20.4 is quite simple and intuitive. At the same time, no compromises have been made on the “secondary” inputs and outputs, like the inserts sends and returns and aux sends. Therefore all connections are balanced and all outputs are nominal +4dBu and able to drive 600 ohms. The gain structure is that all faders up, any input to any output is unity gain.
MCM-20.4 Iss1 Heritage Audio S.L. C/ Ardemans, 42. Local. 28028 Madrid Spain Tel: +00 34 917 266 189 info@heritageaudio.net www.heritageaudio.net * TASCAM and AVID are trademarks of their respective owners and Heritage Audio is in no way affiliated with them. Preliminary User Guide v1.
