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OPERATING INSTRUCTIONS
MDM-832 Distribution Module
POWER
Keep these important operating instructions.
Check www.meyersound.com for updates.
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© 2016 Meyer Sound Laboratories
MDM-832 Operating Instructions, PN 05.245.005.02 A
The contents of this manual are furnished for informational purposes only, are subject to change without notice, and should not be construed as a commitment by Meyer Sound Laboratories Inc. Meyer Sound assumes no responsibility or liability for any errors or inaccuracies that may appear in this manual. Except as permitted by applicable copyright law, no part of this publication may be reproduced,
stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, recording or otherwise, without prior written permission from Meyer Sound.
MDM-832, MJF-212A, MJF-208, LEOPARD, 900-LFC, UPA-1P, RMS, Compass RMS, and all alpha-numeric designations for Meyer Sound
products are trademarks of Meyer Sound. Compass, Galileo, Callisto, Meyer Sound, and the Meyer Sound wave logo are registered trademarks of Meyer Sound Laboratories Inc. (Reg. U.S. Pat. & Tm. Off.). All third-party trademarks mentioned herein are the property of their
respective trademark holders.
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CONTENTS
Chapter 1: Introduction 5
How to Use This Manual 5
MDM-832 Distribution Module 5
Supported Loudspeakers 6
Chapter 2: MDM-832 Power Requirements 7
AC Power Distribution 7
MDM-832 Voltage Requirements 8
MDM-832 Current Requirements 8
Powering On the MDM-832 8
Electrical Safety Guidelines 9
Chapter 3: MDM-832 Front and Rear Panels 11
MDM-832 Front Panel 11
MDM-832 Rear Panel 12
Chapter 4: Powering Loudspeakers with the MDM-832 15
Cable Configurations 16
RMS Network 17
Chapter 5: MDM-832 System Examples 19
(6) MJF-208 and (2) MJF-212A (115 V, 208 V, or 230 V) 19
(12) LEOPARD and (4) 900-LFC (208 V, or 230 V) 21
(8) UPA-1P (115 V, 208 V, 230 V) 23
Appendix A: Composite Cable 25
Appendix B: Orienting the MDM-832 Rackmount Brackets 29
Appendix C: MDM-832 Specifications 31
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CONTENTS
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CHAPTER 1: INTRODUCTION
!
HOW TO USE THIS MANUAL
Make sure to read these instructions in their entirety before
configuring an MDM-832. In particular, pay close attention
to material related to safety issues.
As you read these instructions, you will encounter the following icons for notes, tips, and cautions:
NOTE: A note identifies an important or useful
piece of information relating to the topic under
discussion.
TIP: A tip offers a helpful tip relevant to the topic
at hand.
CAUTION: A caution gives notice that an
action may have serious consequences and
could cause harm to equipment or personnel, or
could cause delays or other problems.
Information and specifications are subject to change.
Updates and supplementary information are available at
www.meyersound.com
Meyer Sound Technical Support is available at:
■ Te l: +1 510 486.1166
■ Te l: +1 510 486.0657 (after hours support)
.
MDM-832 DISTRIBUTION MODULE
The MDM-832 distribution module routes up to eight channels of AC power, balanced audio, and RMS™ to multiple
Meyer Sound self-powered loudspeakers, further enhancing
portability and ease of use for self-powered on-stage monitors or loudspeaker systems. Third-party composite cables
are available to distribute both AC power and balanced
audio with a single cable, streamlining setups and teardowns.
MDM-832 Front Panel (Shown with XLR 5-pin Output Connectors)
MDM-832 Rear Panel
The MDM-832 simplifies distribution by reducing cable clutter in systems that require a reduced footprint, such as onstage monitoring.
■ Web: www.meyersound.com/support
■ Email: techsupport@meyersound.com
The MDM-832 receives balanced audio from eight rearpanel XLR 3-pin female input connectors and routes the
audio to eight front-panel XLR male output connectors.
Audio outputs are available as XLR 3-pin or XLR 5-pin connectors. 3-pin connectors carry balanced audio. 5-pin connectors allow the use of third-party composite cables
carrying both balanced audio and RMS. The rear panel
includes an RMS network connector (and terminator) for
routing RMS signals from the eight front-panel RMS connectors.
AC power is received from a single rear-panel
®
powerCON
32 connector and routed to two sections, each
with four front-panel powerCON 20 connectors.
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CHAPTER 1: INTRODUCTION
!
The MDM-832 features flexible routing, with toggle switches
that route audio inputs to corresponding audio outputs only,
or to adjacent, contiguous audio outputs. For example,
audio input 1 can be routed to audio outputs 1 and 2, and
audio input 3 can be routed to audio outputs 3 and 4.
Another example is to route audio input 1 to audio outputs
1–4, and audio input 5 to audio outputs 5–8. All eight audio
inputs can also be routed directly to their corresponding
audio outputs. A single audio output connector can drive
multiple loudspeakers equipped with loop outputs.
The front panel features two 15 A breaker switches for
enabling AC to outputs 1–4 and 5–8. AC voltage is indicated
by LEDs for each circuit. Each group of four outputs is capable of driving groups of loudspeakers that have a sum total
Maximum Long-Term Continuous Current draw equal to or
below the rating of the MDM-832 breakers.
The 2-space rackmount MDM-832 has adjustable, reversible rack ears, allowing the front panel to be positioned at
either the front or rear of the rack. Depth adjustment allows
the front panel to sit in a recessed position, or flush to the
rack.
CAUTION: Before connecting and applying
power to the MDM-832 be sure to read the
included Safety Instructions and to heed all warnings
in those instructions. Product Safety and Declaration
of Conformity information is also available at
www.meyersound.com
.
SUPPORTED LOUDSPEAKERS
The MDM-832 is an ideal solution for power and signal distribution to small- and medium-sized AC-powered Meyer
Sound loudspeakers with auto-ranging input voltage selection.
The MDM-832 can power groups of loudspeakers which
have a sum total maximum long-term continuous current
draw equal to or below the rating of the corresponding
breaker. Load ratings are indicated adjacent to the breaker
switches on the front panel.
For more information on powering loudspeakers, see
Chapter 4, “Powering Loudspeakers with the MDM-832”
and Appendix C, “MDM-832 Specifications.”
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CHAPTER 2: MDM-832 POWER REQUIREMENTS
!
!
!
Neutral
Ground
MDM-832
unit 1
(208 V AC)
MDM-832
unit 2
(208 V AC)
MDM-832
unit 3
(208 V AC)
Line 1 (120 V AC)
Line 3 (120 V AC)
Line 2 (120 V AC)
Neutral
Ground
Line 1 (230 V AC)
Line 3 (230 V AC)
Line 2 (230 V AC)
MDM-832
(230 V AC)
MDM-832
(230 V AC)
MDM-832
unit 1
(230 V AC)
MDM-832
unit 2
(230 V AC)
MDM-832
unit 3
(230 V AC)
The MDM-832 distribution module combines signal routing
with power capabilities. Understanding power distribution,
voltage and current requirements, and electrical safety
guidelines is critical to the safe operation of the MDM-832.
For additional information about calculating required electrical service and total system load for Meyer Sound power
distribution modules and loudspeakers, refer to
www.meyersound.com
.
CAUTION: Before connecting and applying
power to the MDM-832 be sure to read the
included Safety Instructions and to heed all warnings
in those instructions. Product Safety and Declaration
of Conformity information is also available at
www.meyersound.com
.
AC POWER DISTRIBUTION
All components in an audio system (self-powered loudspeakers, mixing consoles, and processors) must be properly connected to an AC power distribution system, ensuring
that AC line polarity is preserved and that all grounding
points are connected to a single node or common point
using the same cable gauge (or larger) as the neutral and
line cables.
NOTE: Improper grounding of connections
between loudspeakers and the rest of the
audio system may produce noise or hum, or cause
serious damage to the input and output stages of the
system’s electronic components.
CAUTION: Before applying AC power to any
Meyer Sound self-powered loudspeaker, make
sure that the voltage potential difference between
neutral and ground is less than 5 V AC when using
single-phase AC wiring.
120 V AC, 3-Phase Wye System (Two Lines)
Line-Line-Ground
Figure 1 illustrates a 120 V AC, 3-phase Wye distribution
system with three MDM-832 distribution modules. Each
MDM-832 is connected to two lines and a common ground
line. This configuration is possible because the MDM-832
can tolerate elevated voltages from the ground line and does
not require a neutral line. This system delivers 208 V AC to
each module.
Figure 1: 120 V AC, 3-Phase Wye System (Two Lines to Each MDM-832)
TIP: The 120 V AC, 3-phase Wye system with
two lines is recommended because it allows
modules to draw less current than with single-line
systems, thereby reducing voltage drop due to cable
resistance.
230 V AC, 3-Phase Wye System (Single Line)
Line-Neutral-Ground
Figure 2 illustrates a basic 230 V AC, 3-phase Wye distribution system with the load distributed across all three phases,
with each MDM-832 connected to a single line and common
neutral and ground lines. This system delivers 230 V AC to
each module.
CAUTION: Make sure the voltage received by
the MDM-832 remains within its 100–240 V AC
operating window. In addition, the ground line must
always be used for safety reasons and the
line-to-ground voltage should never exceed
250 V AC (typically 120 V AC from line to ground).
Figure 2: 230 V AC, 3-Phase Wye System (One Line to Each MDM-832)
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CHAPTER 2: MDM-832 POWER REQUIREMENTS
!
!
!
CAUTION: For 230 V AC, 3-phase Wye sys-
tems, never connect two lines along with the
neutral line to the AC Input of the MDM-832, as the
resulting voltage would be higher than the allowable
upper voltage range (240 V AC) and would damage
the unit.
MDM-832 VOLTAGE REQUIREMENTS
The MDM-832 operates as intended when receiving AC voltage within the following range:
■ 100–240 V AC, 50–60 Hz.
If the voltage rises above 267 V, the power supplies of connected loudspeakers could become damaged. The
MDM-832 allows any combination of voltage to ground
(neutral-line-ground or line-line-ground).
CAUTION: The power source for the MDM-832
should always operate within the required voltage range, at least a few volts from the upper and
lower ranges. This ensures that AC voltage variations
from the service entry — or peak voltage drops due
to cable runs — will not cause the amplifiers of connected loudspeakers to cycle on and off or cause
damage to loudspeaker power supplies.
MDM-832 CURRENT REQUIREMENTS
The current draw for the MDM-832 and its connected loudspeakers is dynamic and fluctuates as loudspeaker operating levels change. Since different cables and circuit breakers
heat up at varying rates, it is important to understand the following types of current ratings and how they affect circuit
breaker and cable specifications.
■ Idle Current — The maximum rms current during idle
periods.
■ Ultimate Short-Term Peak Current — A rating for
fast-reacting magnetic breakers. It is also used for calculating the peak voltage drop in long AC cable runs
according to the following formula:
V pk (drop) = I pk x R (cable total)
For maximum load values for the MDM-832, see
Appendix C, “MDM-832 Specifications.”
The minimum electrical service amperage required by the
MDM-832 is the sum of the maximum long-term continuous
current for all connected loudspeakers, up to the rating of the
breakers. When calculating the total current draw at the
MDM-832 AC Input, an additional 30 percent above the minimum amperage is recommended to prevent peak voltage
drops at the service entry.
NOTE: For best performance, the AC cable
voltage drop should not exceed 10 percent of
the sum of the maximum long-term continuous current for all connected loudspeakers. Make sure that
even with AC voltage drops that the AC voltage
always remains within the operating window.
POWERING ON THE MDM-832
When powering on the MDM-832 and switching on the
breakers, the AC voltage presence LEDs on the front panel
light up to indicate the presence of AC voltage at each circuit breaker.
CAUTION: If the AC voltage presence LEDs do
not light up, or loudspeakers connected to the
MDM-832 do not output audio after 10 seconds,
switch the breakers to the OFF position and remove
AC power immediately, and verify that the voltage is
within the required range. If the problem persists,
contact Meyer Sound Technical Support.
■ Maximum Long-Term Continuous Current — The
maximum rms current during a period of at least 10 seconds. The maximum long-term continuous current is
used to calculate temperature increases for cables, to
ensure that cable sizes and gauges conform to electrical
code standards. The current rating is also used as a rating for slow-reacting thermal breakers, which are recommended for loudspeaker power distribution. In addition,
the maximum long-term continuous current can be used
to calculate the AC looping capability for the distribution
module and loudspeakers.
■ Burst Current — The maximum rms current during a
period of around 1 second. The burst current is used as
a rating for magnetic breakers.
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ELECTRICAL SAFETY GUIDELINES
Ground
Ground
Make sure to observe the following important electrical and
safety guidelines.
■ The Meyer Sound MDM-832 requires a grounded outlet.
Always use a grounded outlet and plug.
■ Do not use a ground-lifting adapter or cut the AC cable
ground pin.
■ The AC power connector must not be engaged or disen-
gaged when under load or live.
■ The powerCON 32 input connector must not be engaged
or disengaged when under load or live.
MDM-832 OPERATING INSTRUCTIONS
■ The powerCON 20 output connectors must not be
engaged or disengaged when under load or live.
■ Do not use a power cable adapter to drive the unit from a
standard three-prong Edison outlet since that connector
is rated for only 15 A (NEMA 5-15R; 125 V AC max).
■ Do not use a power connector or outlet rated for less
than 32 A.
■ Keep all liquids away from the unit to avoid hazards from
electrical shock.
■ Do not operate the unit if the power cable is frayed or
broken.
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CHAPTER 2: MDM-832 POWER REQUIREMENTS
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CHAPTER 3: MDM-832 FRONT AND REAR PANELS
MDM-832 FRONT PANEL
The MDM-832 front panel includes audio outputs, RMS
FT-10 network connectors, powerCON 20 AC outputs, 15 A
breaker switches, and LEDs for monitoring AC voltage presence at each circuit breaker.
MDM-832 Front Panel
Audio Outputs
The MDM-832’s eight front-panel audio outputs provide balanced audio to connected loudspeakers, routed from the
audio inputs on the rear panel of the MDM-832. Audio outputs are available as either XLR 5-pin male connectors or
XLR 3-pin male connectors.
MDM-832 Audio Outputs (5-pin)
XLR 5-pin male connectors (pin 1, ground; pin 2, signal positive; pin 3, signal negative; pins 4–5, RMS) deliver both balanced audio and RMS signals to connected loudspeakers
with a single, composite cable.
MDM-832 Audio Outputs (3-pin)
XLR 3-pin male connectors (pin 1, ground; pin 2, signal positive; pin 3, signal negative) deliver balanced audio to connected loudspeakers.
NOTE: For information on cable requirements
for any loudspeaker, refer to its operating
instructions. For information on composite cables
available from Meyer Sound, see Appendix A, “Composite Cable.”
Breaker Switches
(Channel 1–4, Channel 5–8)
MDM-832 Breaker Switches
Two front-panel 15 A breaker switches toggle AC power to
the AC Outputs. One breaker switch corresponds to AC
Outputs 1–4; the other breaker switch corresponds to AC
Outputs 5–8.
Each set of four MDM-832 outputs is capable of powering
groups of loudspeakers that have a sum total maximum
long-term continuous current draw equal to or below the rating of the MDM-832 breakers. Load ratings are indicated
adjacent to the breaker switches on the front panel. For
more information on load ratings, see Appendix C,
“MDM-832 Specifications.”
Voltage LEDs (1–2)
Each Voltage LED indicates AC voltage presence for the
corresponding breakers and connected loudspeakers.
Voltage Presence LEDs
State Cause Recommended Action
Unlit The MDM-832 is not con-
nected to mains power, or
breakers are not switched
on.
Lit The MDM-832 is con-
nected to mains power
and breakers are switched
on.
Verify the MDM-832 AC
Input is connected to
mains power; inspect the
power cabling; switch the
breakers to the ON position.
None.
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CHAPTER 3: MDM-832 FRONT AND REAR PANELS
L
N
Ground
Side Front
Rear
!
L
Ground
N
Side Front
Rear
!
RMS Loudspeaker Connectors
The front-panel RMS loudspeaker connectors communicate
over a twisted-pair cable to connected RMS-equipped loudspeakers. The RMS connection allows muting, soloing, and
monitoring of connected loudspeakers from a Mac
®
dows
-based computer.
MDM-832 RMS Loudspeaker Connectors
®
or Win-
These connectors provide the same RMS network connection that is available when using the optional XLR 5-pin male
connectors.
TIP: As an alternative to routing RMS to loud-
speakers through the front-panel FT-10 connectors, MDM-832 modules equipped with 5-pin
connectors can carry both balanced audio and RMS
signals to connected loudspeakers with a single,
composite cable.
AC Outputs
The MDM-832 has eight front-panel powerCON 20
twist-lock AC output connectors (line, neutral, ground) that
provide AC power to loudspeakers connected to the
MDM-832 with powerCON 20 looping power cables.
CAUTION: Before connecting or disconnecting
the MDM-832’s AC outputs, make sure the
front-panel breaker switches are in the OFF position.
The powerCON 20 output connectors should not be
engaged or disengaged while under load or live.
MDM-832 REAR PANEL
The MDM-832 rear panel includes an AC Input connector,
eight audio inputs for receiving source audio, seven Link
switches for routing audio from inputs to outputs, and two
RMS network connectors with terminator switch.
MDM-832 Rear Panel
AC Input
The MDM-832 receives AC power from its powerCON 32
twist-lock AC Input connector (line, neutral, ground).
Located on the rear panel of the unit, this connector is rated
at 32 A and provides a locking connection to avoid accidental disconnections.
MDM-832 AC Output Connectors
Located on the front of the unit, these connectors are rated
at 20 A and provide a locking connection to avoid accidental
disconnections. Use only Meyer Sound self-powered loudspeakers with auto-ranging input voltage selection.
powerCON 20 AC Looping Output Connector
12
powerCON 32 AC Input Connector
CAUTION: When assembling a powerCON 32
cable for use with the MDM-832 AC Input, the
2
cable gauge must be at least 10 AWG or 6 mm
to
ensure safe transmission of 30 A to the distribution
module.
Depending on region, the MDM-832 ships with a power
cable terminated with either a NEMA L6-30P or an
IEC 60309 connector. The power cable can accept different
power connector types for outlets used throughout the
world. Make sure to use the correct power connector for the
AC power in your area. The MDM-832 operates as intended
within an AC voltage range of 100–240 V at 50–60 Hz.
Page 13
MDM-832 OPERATING INSTRUCTIONS
!
In 1 In 2 In 3 In 4 In 5 In 6 In 7 In 8
Out 1 Out 2 Out 3 Out 4 Out 5 Out 6 Out 7 Out 8
In 1
CAUTION: Do not use a power cable adapter
to drive the MDM-832 from a standard
three-prong Edison outlet since that connector is
rated for only 15 A (NEMA 5-15R; 125 V AC max).
The MDM-832 requires grounded outlets. To operate safely
and effectively, it is extremely important that the entire system be properly grounded. For information about supplying
power to the MDM-832, see Chapter 2, “MDM-832 Power
Requirements.”
Audio Inputs
Up to eight channels of balanced audio are received from
the MDM-832’s eight rear-panel audio inputs. The inputs are
equipped with XLR 3-pin female connectors (pin 1, ground;
pin 2, signal positive; pin 3, signal negative). Make sure to
use standard balanced XLR cables with each pin connected
at both ends.
NOTE: Inputs are inactive when the Link switch
for the preceding input is enabled. Connec-
tions should not be made to inactive inputs.
Link Switch Routing Examples
The following examples illustrate several common routing
applications for the Link switches.
Routing One Input to Eight Outputs
To route one input to eight channel outputs:
■ Set all Link switches to ON.
Link 1 Link 2 Link 3 Link 4 Link 5 Link 6 Link 7
On On On On On On On
MDM-832 Audio Inputs
Audio inputs default to being routed to their corresponding
audio outputs. Inputs can also be routed to adjacent outputs
with the Link switches, though this affects their input impedance (see “Input Impedance for Linked Channel Inputs” on
page 14).
Link Switches
Link switches determine how inputs are routed to outputs.
When an input’s Link switch is OFF (set to the down position), the input is only routed to its corresponding output, for
example, Input 1 routed to Output 1.
When a Link switch is ON (set to the up position), the input is
routed to its corresponding output and also to the next adjacent output, for example, Input 1 routed to Output 1 and
Output 2.
If multiple adjacent Link switches are ON, the input is routed
to each adjacent output. For example, when Link switches 1
and 2 are ON, Input 1 is routed to Outputs 1–3.
Link Switches
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CHAPTER 3: MDM-832 FRONT AND REAR PANELS
In 1 In 2 In 3 In 4 In 5 In 6 In 7 In 8
Out 1 Out 2 Out 3 Out 4 Out 5 Out 6 Out 7 Out 8
In 1 In 2 In 3 In 4 In 5 In 6 In 7 In 8
In 1 In 2 In 3 In 4 In 5 In 6 In 7 In 8
Out 1 Out 2 Out 3 Out 4 Out 5 Out 6 Out 7 Out 8
In 1 In 2 In 3 In 4 In 5 In 6 In 7 In 8
Routing Two Inputs to Four Outputs Each
To route two inputs to four channel outputs each:
■ Set the Link 4 switch to OFF and all other Link switches
to ON.
Link 1 Link 2 Link 3 Link 4 Link 5 Link 6 Link 7
On On On Off On On On
Routing Eight Inputs to Eight Separate Outputs
To route eight inputs to eight separate channel outputs:
■ 2 channel outputs, 5 kOhms input impedance
■ 4 channel outputs, 2500 ohms input impedance
■ 8 channel outputs, 1250 ohms input impedance
To avoid distortion when linking channel inputs, make sure
the source device can drive the total load impedance of the
linked loudspeakers. The audio source must be capable of
producing +20 dBV (10 V rms, 14 V peak) into 600 ohms to
produce the maximum peak SPL over the operating bandwidth of the connected loudspeaker.
NOTE: Most source devices are capable of
driving loads no smaller than 10 times their
output impedance. To drive eight loudspeakers linked
from a single channel input, the source device should
have an output impedance of approximately
100 ohms or less.
RMS Network Connectors
The RMS section of the user panel includes two network
connectors and a Terminator switch.
■ Set all Link switches to OFF.
Link 1 Link 2 Link 3 Link 4 Link 5 Link 6 Link 7
Off Off Off Off Off Off Off
Input Impedance for Linked Channel Inputs
When a Link switch is enabled, the channel input’s unbuffered source signal is transmitted in parallel to each linked
channel output. This causes the channel input’s impedance
(normally 10 kOhms for one loudspeaker) to be reduced for
each linked output. For example:
Rear-Panel RMS Network Connectors
The rear-panel Weidmuller 2-conductor, locking connectors
transfer data to and from the RMS network by providing a
connection between the distribution module and RMServer,
and can be used to extend the RMS network to additional
distribution modules. Included with each MDM-832 are
Weidmuller cable connectors and mounting blocks for constructing RMS cables. The RMS blocks allow cables to be
securely attached to the RMS module with screws.
RMS Terminator Switch
The Terminator switch engages an internal resistive, capacitive circuit designed to prevent electrical reflections in the
RMS network. If the RMServer is receiving poor data or
experiencing other communications problems with the RMS
network, switching the Terminator switch to the ON position
may help increase network stability.
■ 1 channel output, 10 kOhms input impedance
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CHAPTER 4: POWERING LOUDSPEAKERS WITH THE MDM-832
!
!
NOTE: For information on cable requirements
for your loudspeaker, refer to its operating
instructions. For information on cables available from
Meyer Sound, see Appendix A, “Composite Cable.”
To connect loudspeakers to the MDM-832:
1. Switch both breakers on the MDM-832 front panel to the
OFF position.
2. Disconnect the MDM-832 from the AC mains wall receptacle.
3. Connect audio sources (from a mixer or processor) to the
MDM-832 Audio Inputs with balanced XLR cables.
4. Use the MDM-832 Link switches to route audio inputs to
the desired audio outputs (see “Link Switches” on
page 13).
5. Connect the MDM-832 AC Outputs to loudspeaker AC
Inputs with powerCON 20 cables.
NOTE: To provide AC power, balanced audio,
and RMS to loudspeakers using a single com-
posite cable, see Appendix A, “Composite Cable.”
6. Connect the MDM-832 audio outputs to loudspeakers.
■ If the MDM-832 is outfitted with XLR 3-pin male outputs,
use balanced cables. Optionally, use RMS cables to connect the MDM-832 front-panel RMS loudspeaker connectors to loudspeaker RMS modules.
9. Switch both breakers on the MDM-832 front panel to the
ON position. Monitor the front-panel LEDs to verify that
voltage is present. For more information, see “Voltage
LEDs (1–2)” on page 11.
10. Check loudspeaker LEDs to verify whether the loudspeakers are powered and ready to reproduce audio.
11. Enable output from the audio sources (from the mixer or
processor) connected to the MDM-832.
In addition to connecting each loudspeaker directly to the
MDM-832, a loop configuration can be established by using
the loop outputs of connected loudspeakers to provide AC
power, balanced audio, and RMS to additional loudspeakers. For examples of this type of configuration, see “Cable
Configurations” on page 16.
NOTE: Using the MDM-832 linked outputs or
loudspeaker loop outputs to drive additional
loudspeakers affects their input impedance. For more
information, see “Input Impedance for Linked Channel Inputs” on page 14.
CAUTION: The powerCON 32 input connector
and powerCON 20 output connectors should
not be engaged or disengaged while under load or
live.
■ If the MDM-832 is outfitted with XLR 5-pin male outputs,
use composite cables wired for both balanced audio and
RMS and terminated with the XLR 5-pin connectors.
CAUTION: Each set of four MDM-832 outputs
is capable of powering groups of loudspeakers
that have a sum total maximum long-term continuous
current draw equal to or below the rating of the corresponding breaker. Load ratings are indicated adjacent to the breaker switches on the front panel. For
more information, see Appendix C, “MDM-832 Specifications”.
7. Connect the MDM-832 to the AC mains wall receptacle.
8. If an RMS network is available, connect the MDM-832’s
rear-panel RMS network connectors to the RMServer.
For more information, see “RMS Network” on page 17.
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CHAPTER 4: POWERING LOUDSPEAKERS WITH THE MDM-832
Legend
Composite Cable (Balanced Audio, RMS, Power)
MJF-210
Legend
Composite Cable (Balanced Audio, RMS, Power)
MJF-210
Legend
Balanced Audio and RMS
Power
MJF-210
Legend
Balanced Audio and RMS
Power
MJF-210
CABLE CONFIGURATIONS
Cabling from the MDM-832 to loudspeakers can be configured with composite or separate cables, with loop outputs
or without.
Composite Cables
Composite cables carry AC power, balanced audio, and
RMS directly to loudspeakers through a single cable.
MDM-832 Connected to Loudspeakers with Composite Cables
Composite Cables using Loop Outputs
Composite cables carry AC power, balanced audio, and
RMS through a single cable. Channels of the MDM-832 are
connected to loudspeakers, which in turn use loop outputs
to distributed AC power, balanced audio, and RMS to additional loudspeakers.
Separate Cables
Separate cables carry AC power, balanced audio, and RMS
directly to loudspeakers.
MDM-832 Connected to MJF-210 Loudspeakers with Separate Cables
NOTE: MDM-832 modules equipped with XLR
3-pin outputs send balanced audio and RMS
through separate cables.
Separate Cables using Loop Outputs
Separate cables carry AC power, balanced audio, and RMS.
Channels of the MDM-832 are connected to loudspeakers,
which in turn use loop outputs to distributed AC power, balanced audio, and RMS to additional loudspeakers.
MDM-832 Connected to Loudspeakers with Composite Cables and
Loop Outputs
16
MDM-832 Connected to MJF-210 Loudspeakers with Separate Cables
and Loop Outputs
Page 17
MDM-832 OPERATING INSTRUCTIONS
RMS NETWORK
The RMS remote monitoring system network connections
allow the MDM-832 distribution module to be connected to
an RMS network. RMS reports, in real time, the status and
power usage of multiple Meyer Sound loudspeakers from a
Mac or Windows-based computer. The host computer communicates with RMS-equipped loudspeakers and power
supplies via RMServer
ware unit with two FT-10 ports. RMServer stores system
configurations internally, eliminating most manual data entry.
Systems can be monitored from a laptop at front-of-house
or backstage, or from a tablet computer anywhere within the
venue over WiFi.
By connecting the MDM-832 to an RMS network and utilizing the front-panel XLR 5-pin male connectors or the
front-panel RMS loudspeaker connectors, connecting loudspeakers equipped with RMS modules to the MDM-832
allows distribution of network information between the loudspeakers and RMServer.
NOTE: RMS does not control AC power.
NOTE: For the latest RMS system require-
ments, visit the Meyer Sound website
(http://www.meyersound.com
™
, a compact, Ethernet-based hard-
).
Compass RMS Software
Compass RMS™ software provides extensive system status
and performance data for each loudspeaker, including
amplifier voltage, limiting activity, power output, fan and
driver status, as well as mute and solo capability. Loudspeakers are added to the RMS network and assigned a
node name during a one-time discovery procedure. Once
loudspeakers are identified on the RMS network, they
appear in the Compass RMS software as icons that can be
customized.
Compass RMS Window
Connecting to Additional Distribution Modules and RMServer
When using multiple distribution modules, the RMS network
can be extended between them (daisy-chained) such that all
connected loudspeakers report their operating parameters
to the RMS network through the distribution modules.
To extend the RMS network between multiple MDM-832
distribution modules, connect an RMS cable to one of the
rear-panel RMS network ports of one module, then connect
the other end to one of the RMS network ports of the second module.
To connect the MDM-832 to RMServer, connect an RMS
cable to one of the RMS network ports of the MDM-832,
then connect the other end to one of the FT-10 ports of
RMServer.
NOTE: For more information about RMServer,
refer to the RMServer Hardware Guide
(PN 05.222.024.01) and the Remote Monitoring System User Guide (PN 05.033.302.18).
Individual loudspeakers can be physically identified with the
Wink option in RMS, which lights the Wink LED on the RMS
module for that particular loudspeaker. Conversely, a loudspeaker can be identified in Compass RMS by pressing the
Service or Identify button on the loudspeaker’s RMS module.
Loudspeaker icons can be arranged to represent how loudspeakers have been deployed in the system. Multiple pages
can be saved and recalled for specific performances and
venues.
17
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CHAPTER 4: POWERING LOUDSPEAKERS WITH THE MDM-832
18
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CHAPTER 5: MDM-832 SYSTEM EXAMPLES
Legend
Balanced Audio and RMS
Power
Galileo Callisto Channels
Galileo Callisto 616
MJF-212A
MJF-208
42315
5511
2
4
33
NOTE: Separate power and signal connections are shown in all system examples. To simplify cable runs, use
composite cable to carry both power and signal to each loudspeaker. See Appendix A, “Composite Cable.”
(6) MJF-208 AND (2) MJF-212A (115 V, 208 V, OR 230 V)
19
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CHAPTER 5: MDM-832 SYSTEM EXAMPLES
List of Components
Table 1: (6) MJF-208 and (2) MJF-212A
Part Number Description Count
09.245.001.01 (UL) or 09.245.001.03 (CE) MDM-832 Distribution Module (5-pin) 1
27.033.111.01 or compatible third-party composite cable
466.047 powerCON 20 loop output connector (NAC3FCB) 8
466.044 powerCON 20 input connector (NAC3FCA) 8
464.027 XLR 5-pin male connector (NC5MX-B) 8
464.026 XLR 5-pin female connector (NC5FX-B) 8
Composite cable, 30 m 5
Composite cable, 1.5 m 3
20
Page 21
(12) LEOPARD AND (4) 900-LFC (208 V, OR 230 V)
Legend
Balanced Audio and RMS
Power
Galileo Callisto Channels
Galileo Callisto 616
LEOPARD
900-LFC
59... 10 11 12 13
1234
1
1
2
3
4
5
4
5
9
9
10
11
12
13
12
13
MDM-832 OPERATING INSTRUCTIONS
21
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CHAPTER 5: MDM-832 SYSTEM EXAMPLES
List of Components
Table 2: (12) LEOPARD and (4) 900-LFC
Part Number Description Count
09.245.001.01 (UL) or 09.245.001.03 (CE) MDM-832 Distribution Module (5-pin) 2
Composite cable, 30 m 10
27.033.111.01 or compatible third-party composite cable
466.047 powerCON 20 loop output connector (NAC3FCB) 4
466.044 powerCON 20 input connector (NAC3FCA) 16
464.027 XLR 5-pin male connector (NC5MX-B) 16
464.026 XLR 5-pin female connector (NC5FX-B) 16
Composite cable, 1.5 m 2
Composite Cable, 1 m 4
22
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MDM-832 OPERATING INSTRUCTIONS
Legend
Balanced Audio
RMS
Power
Galileo Callisto Channels
Galileo Callisto 616
UPA-1P
423
1
11 22 33 44
(8) UPA-1P (115 V, 208 V, 230 V)
23
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CHAPTER 5: MDM-832 SYSTEM EXAMPLES
List of Components
Table 3: (8) UPA-1P
Part Number Description Count
09.245.001.02 (UL) or 09.245.001.04 (CE) MDM-832 Distribution Module (3-pin) 1
27.033.111.01 or compatible third-party composite cable
466.047 powerCON 20 loop output connector (NAC3FCB) 8
466.044 powerCON 20 input connector (NAC3FCA) 8
464.046 XLR 3-pin male connector (NC3MX-B) 8
464.047 XLR 3-pin female connector (NC3FX-B) 8
484.033 RMS connector (Weidmuller) 16
Composite cable, 30 m 4
Composite cable, 1.5 m 4
24
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APPENDIX A: COMPOSITE CABLE
COMPOSITE CABLE AND CONNECTORS
Composite cable and loudspeaker connectors are available from Meyer Sound. Composite cable can be terminated to carry
AC power, balanced audio, and RMS from the MDM-832 distribution module to AC-powered Meyer Sound loudspeakers.
NOTE: Bulk cable is comprised of three 14 AWG wires for AC power, one pair of 24 AWG wires for balanced
®
audio, and one pair of 24 AWG wires for RMS. Third-party cables (Gepco
Sommer Monolith, Whirlwind
Part Number Description Use
27.033.111.01 Breakout Cable UL AWN style 2464
500 ft roll (152.4 m)
464.026
464.027 Neutrik XLR 5-pin male (NC5MX-B) Connects to loudspeaker XLR 5-pin audio inputs. Carries balanced
464.046 Neutrik XLR 3-pin male (NC3MX-B) Connects to loudspeaker XLR 3-pin audio inputs. Carries balanced
464.047 Neutrik XLR 3-pin female (NC3FX-B) Connects to MDM-832 XLR 3-pin audio outputs or loudspeaker audio
466.044 powerCON 20 input connector (NAC3FCA) Connects to loudspeaker AC Inputs.
466.047 powerCON 20 loop output connector (NAC3FCB) Connects to MDM-832 AC outputs or loudspeaker AC loop outputs.
484.033 Weidmuller RMS connector Connects to MDM-832 and loudspeaker RMS inputs.
Neutrik
®
XLR 5-pin female (NC5FX-B)
™
APC series, Klotz composite, or equivalent) can also be used.
AC conductors insulated separately with PVC. Intended for applications where bundled cables fan out to separate locations.
Connects to MDM-832 XLR 5-pin audio outputs or loudspeaker audio
loop outputs. Carries balanced audio and RMS.
audio and RMS.
audio.
loop outputs. Carries balanced audio.
RunONE™, Pro Co™ Siamese Twins,
ASSEMBLING COMPOSITE CABLES
When connecting loudspeakers to the MDM-832 with composite cable, you must terminate each end of the cable with the
correct connectors to supply AC power, balanced audio, and RMS to the loudspeaker. XLR 5-pin connectors can be used
with composite cables to carry RMS and balanced audio through a single connector, provided the MDM-832 and connected
loudspeakers are configured with XLR 5-pin connectors. XLR 3-pin connectors can be used with composite cables to carry
RMS and balanced audio through separate connectors, provided the MDM-832 and connected loudspeakers are configured with XLR 3-pin connectors.
Assembled Composite Cable with powerCON 20 and XLR 5-pin Connectors.
Assembled Composite Cable with powerCON 20, XLR 3-pin, and Weidmuller RMS Connectors.
25
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APPENDIX A: COMPOSITE CABLE
0.7”
0.16”
!
To assemble a composite loudspeaker cable:
1. Cut the bulk cable to the desired length, including fanout length.
2. Strip the outer jacket to the desired fanout length.
3. Remove excess binder.
4. Strip 0.7 inch (18 mm) of the jacket from each of the two signal pairs.
5. Unwind each shield, then twist to form a third conductor.
6. Trim the foil shield and rod fillers of each signal pair so they sit flush with the jacket.
7. Strip each conductor of the two signal pairs by approximately 0.16 inch (4 mm).
Signal Pair Exposed Lengths
8. Tin exposed conductors and then solder to the XLR connector using the following wiring scheme.
Composite Cable Signal Pinout (XLR)
Type Outer Jacket Color Pin Function Wire Color
1 Audio Shield Silver
XLR 3-pin (Balanced Audio)
and Weidmuller (RMS)
Two pair; XLR 5-pin
(Balanced Audio and RMS)
Blue (signal pair 1)
Blue (signal pair 1)
Black (signal pair 2)
2Audio Signal (+) Blue
3 Audio Signal (-) White
1
2Audio Signal (+) Blue
3 Audio Signal (-) White
4 RMS (polarity insensitive) Blue
5 RMS (polarity insensitive) White
1 Audio Shield Silver
Audio Shield Silver
CAUTION: When wiring cables for the MDM-832 AC outputs, it is extremely important that each pin in the con-
nector be wired correctly, to avoid damage to the loudspeaker. In addition, make sure that audio pins are wired
correctly; polarity reversals for audio signals affect system performance. RMS connectors are polarity insensitive.
NOTE: For RMS connections in systems with XLR 3-pin audio connections, terminate the second audio pair
with Weidmuller RMS connectors according to the RMS Connector Assembly Instructions (PN 28.033.060).
For RMS connections in systems with XLR 5-pin audio connections, terminate both signal cable shields to pin 1.
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MDM-832 OPERATING INSTRUCTIONS
Blue (N)
Green/Yellow (Ground)
Green (Ground)
Black (L)White (N) Brown (L)
L
N
Ground
!
!
9. Prepare and assemble the power cable according to the Assembly Instructions provided with your powerCON 20 con-
nectors. Terminal connections use the following wiring scheme.
Power Cable Colors
powerCON 20 Terminals
Composite Cable AC Wiring Scheme (powerCON 20)
Connector Type Te rm i n al Function Wire Color
U.S / Canada (60 Hz)
Ground Ground Green Green/Yellow
NAC3FCA (power in)
NAC3FCB (power out)
N Neutral White Blue
L Line Black Brown
Wire Color
Europe (50 Hz)
CAUTION: When wiring AC power cables and distribution systems, it is important to preserve AC line polarity
and connect the ground on both ends of the cable.
CAUTION: The MDM-832 requires
a grounded connection. Always use a grounded outlet and plug.
27
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APPENDIX A: COMPOSITE CABLE
28
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APPENDIX B: ORIENTING THE MDM-832 RACKMOUNT BRACKETS
The MDM-832 ships with its reversible rackmount brackets
in a front-facing flush position. The rackmount brackets can
be oriented to recess the distribution module from the rack
face, position the front panel of the distribution module at
the rear of the rack, or position and recess the front panel of
the distribution module at the rear of the rack.
To orient the MDM-832 rackmount brackets:
1. Use a #2 Phillips screwdriver to remove the four screws
from each rackmount bracket.
2. Do one of the following:
■ To mount the module with the front panel recessed, slide
the rackmount brackets forward until the rear sets of
screw holes line up with the screw holes in the chassis.
■ To mount the module with the rear panel in a recessed
position at the front of the rack, rotate the rackmount
brackets to face the rear panel, then adjust so the rear
sets of screw holes line up with the screw holes in the
chassis.
3. Use a #2 Phillips screwdriver to re-install the screws to
secure the rackmount brackets to the enclosure.
■ To mount the module with the rear panel at the front of
the rack, rotate the rackmount brackets to face the rear
panel, then adjust so the front sets of screw holes line up
with the screw holes in the chassis.
®
TIP: Use of Loctite
243 or equivalent medium-
strength, removable thread-locking adhesive is
recommended for secure and non-permanent installation of the rackmount bracket screws.
4. Secure the MDM-832 to the rack rails with four 10-32
truss head screws.
29
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APPENDIX B: ORIENTING THE MDM-832 RACKMOUNT BRACKETS
30
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APPENDIX C: MDM-832 SPECIFICATIONS
MDM-832 Specifications
FRONT PANEL
Audio Outputs Eight gold-plated XLR 3-pin or XLR 5-pin male connectors
RMS loudspeaker Eight RMS FT-10 network connectors, connecting RMS-equipped
loudspeakers to the RMS network
LEDs Two LED indicators for AC voltage presence
AC Outputs Eight powerCON 20 connectors
Note: Connect only to Meyer Sound self-powered loudspeakers with auto-ranging input voltage
selection.
Circuit Breakers Two 15 A breaker switches for enabling AC outputs 1–4 and 5–8
REAR PANEL
Audio Inputs Eight gold-plated XLR 3-pin female connectors
Link switches to route to outputs
RMS Network/Thru Two RMS FT-10 network connectors with terminator, reporting
all connected amplifier operating parameters to the RMServer
AC Input One powerCON 32 connector
AC POWER
Safety Rated Voltage Range 100–240 V AC, 50–60 Hz
Safety Rated Total Load,
Output 1–4
Safety Rated Total Load,
Output 5–8
Combined Total Load 24 A (UL/cUL); 30 A (IEC/EN)
PHYSICAL
Dimensions 2-space rackmount
Weight 12 lbs (5.4 kg)
Finish Low-gloss black, very fine textured
ENVIRONMENTAL
Operating Temperature
Non Operating Temperature
Humidity
Operating Altitude
Non Operating Altitude
Shock
Vibration
12 A (UL/cUL); 15 A (IEC/EN)
Note: Must meet or exceed the sum of the maximum long-term continuous current draw of all
loudspeakers connected to AC Outputs 1–4.
12 A (UL/cUL); 15 A (IEC/EN)
Note: Must meet or exceed the sum of the maximum long-term continuous current draw of all
loudspeakers connected to AC Outputs 5–8.
Note: Indicates the maximum combined safety rated total load for AC Outputs 1–8.
19.00 inches W x 3.50 inches H x 8.50 inches D
(483 mm x 89 mm x 216 mm)
0° C to +45° C
–40° C to +75° C
To 95% at 35° C
To 5000 m (16,000 ft)
To 12000 m (39,000 ft)
30 g 11 msec half-sine on each of 6 sides
10 Hz – 55 Hz (0.010 m peak-to-peak excursion)
31
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APPENDIX C: MDM-832 SPECIFICATIONS
17.00
[432 mm]
8.50
[216 mm]
19.00
[483 mm]
3.50
[89 mm]
Front view (3-pin output connectors)
Front view (5-pin output connectors)
Top view (recessed position)
Top view (flush position)
MDM-832 DIMENSIONS
MDM-832 Dimensions
32
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MDM-832 OPERATING INSTRUCTIONS
Page 34
Page 35
Page 36
Meyer Sound Laboratories Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
+1 510 486.1166
www.meyersound.com
© 2016
Meyer Sound. All rights reserved.
MDM-832 Operating Instructions
PN 05.245.005.02 A
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