Marshall Amplification AR-DM61-BT User Manual

Broadcast A/V Division

AR-DM61-BT

Multichannel Digital Audio Monitor

User Manual

[Firmware Version 0.43]

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Table of Contents

Introduction

2. Package Contents

3. Quick Start Guide

4. Short Cut Buttons

5. Audio Metering Features

6. Video Display Features

7. System Settings

8. Options (Dolby® & Dante®)

9. Network Control – Initial Setup

10. Network Control – Operation

11. Dimensions

12. Specifications

13. Analog & AES Connector Details

Warranty

1. Features

03

04

07

08

09

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12

14

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The Marshall AR-DM61 audio monitor rack has an advanced design with the ability to
adapt to future needs. Its sonic performance is impressive, exceeding the capabilities
of many larger 2RU designs. In addition, the convenient front panel touch screen is the
first in the industry capable of providing high resolution 96-step audio metering or 64
channel side-by-side audio bars in the same unit. This breakthrough design removes
many limitations found in other products. Built-in support for most common input types.
Easy upgrades for Dolby, Dante / AES-67 options.

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Touch Screen Convenience and Flexibility

• Eliminates most mechanical components

• Quickly switch display modes between multi-channel and high-precision

• Layout design not “frozen”

Integrated Video Display

• Provides visual confirmation of selected SDI input

• Displays selected audio channel numbers and video
format

High Performance Audio – Punches Above Its Weight

• Matches or exceeds most 2RU designs

• Enough “punch” for the noisiest server rooms

One Model Supports Multiple Input Types

• Two 3G SDI / MADI (auto-detection) Inputs - Standard

• 8 Channels AES / EBU Digital - Standard

• 8 Channels Analog Balanced - Standard

• Up to 64 Dante / AES-67 Channels - Option

• Dolby Decode - Option Plug-in Card

Network Control

• Web Browser Configuration

Compact 1RU Design Saves Rack Space

1. AR-DM61 main chassis

2. 24-volt DC universal power supply (120/240 VAC, 50/60Hz)

1. Features

2. Package Contents

Powering up - Once power is initially applied, please allow approximately 30 seconds for the unit

to become functional. When the unit is ready for operation, the audio bars will display. You should
see something like this:

Basic operation – First, select the Menus button, then select the desired input from the selections
that appear.

Use the front panel Volume knob to adjust the sound to a comfortable level. The unit may be quickly
silenced by pressing the front panel Mute button.

Note: When SDI 1 or SDI 2 is selected as the input source, it will also be routed to the SDI / MADI
output connector on the back panel. When it is connected to a video monitor, it will “follow” the
input selection. This feature is intended as a convenience only and is not intended to replace a
production router. MADI output from this same connector is currently in development and not
enabled in this software version.

Monitoring Mode Selection - Quick access to common monitoring modes is available by selecting
MONO, STEREO or LRC depending on what you wish to hear.

MONO – Single audio channel selected and played from both speakers.

STEREO – A pair of audio channels is selected. The lower channel number will be heard from

the left speaker and the higher channel number from the right speaker. In this mode, a phase
“correlation” meter appears just below the HOME button.

LRC – Three channels are selected with the Center choice heard from both speakers.

3. Quick Start Guide

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After selecting the desired monitoring mode, simply tap the BUTTON below the displayed audio
bars to select channel or channels to monitor. In the example below, STEREO mode has been
chosen and Channel pair 3 / 4 was selected for monitoring.

Mix Plus or Mix Minus Feature – By pressing a meter BAR, channels may be quickly added or
subtracted from a monitor mix.

For example: If it is then desired to listen to ONLY channel 3, press the meter BAR for channel 4
and it will drop out of the mix. Press any other bar or bars in the same group of 8 channels and they
can be ADDED to the mix.

In the picture below, MONO mode has been chosen then channels 3 and 5 have been ADDED to
the mix.

Note: Pressing the HOME button will return to the normal display and default to channel 1 / 2
monitoring.

MADI and Dante input types are handled somewhat differently from the other input types. MADI is a
standard feature and is input via either of the SDI input connectors. When MADI is detected on one
of the inputs, it will automatically appear in place of the SDI choice as shown below. In this picture,
a MADI source is connected to SDI input 2.

The Dante option is selected from the Menus page when the Dante upgrade board is present.
Sources are routed using the Dante Manager™ which is a free download from Audinate

®

.

MADI and Dante modes support up to 64 audio channels. All 64 can be displayed at once as seen in
the figure below. This can be quite useful finding “stray” or missing channels. However, because the
meter bars become very small, this is not the ideal display mode for selecting individual channels
or stereo pairs.

A group of 16 channels may be isolated by first selecting MONO, STEREO or LRC, then select one
of the channel ranges to narrow the focus to a group of 16 channels. From there it is quite easy to
monitor the desired channels in that group.

In the example below, LRC mode and channel group 33 – 48 have been selected. Channels 36, 37
and 38 are being monitored as Left, Right, Center from the speakers.

An arbitrary group of channels may be added or subtracted from the monitor mix by selecting the
meter bar above the desired channel(s). In the example below, MONO was selected then channels
3 and 5 were added.

NOTE: Only channels in a cluster of 8 may be monitored in this way. That is, any channels from 1
– 8 or 9 – 16, etc. may be combined but channels in different 8 channel groups, say 7 and 15 may
not be combined.

Click button to select a group

Click bar to add or remove a channel

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4. Short Cut Buttons 5. Audio Metering Features

The Short Cut Buttons are the group of 9 buttons
to the left side of the display. The figure below
shows them in their most common configuration.

HOME – Selecting HOME reverts the unit to the default display mode. That is, vertical bars, STEREO
mode with Channels 1 & 2 selected as Left & Right.

LKFS – Produces a single horizontal bar representing the LKFS weighting and averaging algorithm.
(Currently under development). Pressing the RST PKS button on this screen restarts the averaging
process and resets the peak markers.

SOLO – Solo mode has much the same effect as MONO mode except that the display style does
not change. Tap on the desired meter bar to hear audio from that single channel. The selected
channel will be heard from both speakers.

RST PKS –The “Reset Peaks” button clears all audio bar peak hold “top hat” markers back to their
base position.

MIX – The MIX button enables a down-mix from multiple channels. The particular mix that is heard
when the MIX button is selected depends on settings made through the web browser interface (see
Network Control section below). When no changes have been made through the browser interface,
the default mix is assumed for 5.1 Surround with appropriate gain scaling. Custom mixes may be
created for each Input.

MONO, STEREO, LRC – These functions are described in Quick Start section above. They provide
monitoring of one, two or three source channels respectively.

The figure above shows the audio bars in their most common arrangement. A great deal of
information is available at a glance including: recent Over Range Amount, current audio Peak and
Average and Phase Correlation. Over Range and Peak markers are reset with the RST PKS button
in the Short Cut area.

Audio Bar Structure – Bars are grouped in pairs. The middle portion of each pair represents
the average audio level while the narrow portions show the peaks. Each has its own “peak hold”
markers. Bars representing the audio channels being heard on the speakers will be highlighted.
Below the selected audio pair, is a horizontal bar which is the phase correlation meter.

Phase Correlation Meter – The phase correlation meter registers to the right (Green) when the
selected pair of channels would have best “mono compatibility”. It will register in the center when
the two channels come from different sources or have little relationship to each other. Finally, it will
register to the left (Red) when one of the two channels has reversed polarity or 180-degree phase
shift compared to the other channel in that pair.

NOTE: The number of bars that will be displayed depends on the type of input selected.

SDI Inputs = 16 Bars displayed

AES and Analog = 8 Bars displayed

Dante and MADI = 64 Bars (can be subdivided to 16 channels using MONO, STEREO or LRC

monitoring selections)

Over Range Level

Peak Levels on Sides

Average Levels in Middle

Phase Correlation Meter