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LEO-M
Operating Instructions Manual
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Meyer Sound LEO-M Operating Instructions Manual

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OPERATING INSTRUCTIONS
LEO-M™ Linear Line Array Loudspeaker
LINE ARRAY
Keep these important operating instructions.
Check www.meyersound.com for updates.
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.
Compass RMS, GuideALink, Intelligent AC, LEO-M, LYON, MAPP, QuietCool, RMS, RMServer, and all alpha-numeric designations for Meyer Sound products and accessories are trademarks of Meyer Sound. Callisto, Galileo, LEO, Meyer Sound, the Meyer Sound wave logo, MICA, QuickFly, REM, SIM, and TruPower 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 LEO-M Linear Line Array Loudspeaker 5
Chapter 2: Power Requirements 7
AC Power Distribution 7 AC Input 8 Wiring AC Power Cables 8 LEO-M Voltage Requirements 9 LEO-M Current Requirements 9 Do Not Reset Circuit Breakers! 10 Intelligent AC Power Supply 10 Electrical Safety Guidelines 10
Chapter 3: Amplification and Audio 11
Audio Connectors 11 Cable Rings 12 TruPower Limiting 12 Amplifier Cooling System 13
Chapter 4: QuickFly Rigging 15
Important Safety Considerations! 15 LEO-M Rigging Options 15 LEO-M GuideALinks 17 When to Move the Locking Pins to the “Stow Pin” Position 18
Chapter 5: RMS Remote Monitoring System 19
Compass RMS Software 19 RMS Module 20 Neuron ID for RMS Module 20 Resetting the RMS Module 20
Chapter 6: System Design and Integration Tools 21
MAPP System Design Tool 21 SIM 3 Measurement System 22
Appendix A: Rain Hoods 23 Appendix B: Specifications 25
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iv

CHAPTER 1: INTRODUCTION

!

HOW TO USE THIS MANUAL

Make sure to read these instructions in their entirety before configuring a Meyer Sound loudspeaker system. 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)
■ Web: www.meyersound.com/support
■ Email: techsupport@meyersound.com

LEO-M LINEAR LINE ARRAY LOUDSPEAKER

The LEO-M™ linear array loudspeaker is defined by its sonic linearity at any output level. With exceptional headroom, extremely low distortion, and optimized rigging options, LEO-M forms the nucleus of Meyer Sound’s next-generation
®
LEO
array systems, conceived for long-throw applications. LEO arrays are ideally paired with Meyer Sound’s 1100-LFC low-frequency control element for bass reproduction, and the LYON MICA also well suited for downfill. Entire systems are driven by
™
linear line array loudspeaker for downfill. The
®
compact high-power curvilinear array loudspeaker is
Meyer Sound’s Galileo Callisto
™
616 array processor, which provides matrix routing, alignment, and processing for array components.
LEO-M Loudspeaker
To guarantee optimum performance, LEO array systems should be designed with Meyer Sound’s MAPP
™
prediction software. The intuitive, cross-platform application accurately predicts coverage patterns, frequency and impulse responses, and maximum peak SPL for LEO array systems, ensuring that systems deliver the required SPL and ideal coverage for the intended audience areas.
LEO-M’s high-frequency section is comprised of two propri­etary compression drivers coupled to a constant-directivity horn through a patented REM
®
manifold. The manifold’s smooth radiating characteristics afford tight vertical cover­age. The low-frequency section includes two long-excursion cone drivers, also proprietary, capable of withstanding high, continuous output levels. Precise phase and magnitude alignment between low- and high-frequency drivers yields consistent and well-behaved system responses.
The unit’s onboard power amplifier operates at nominal volt­ages from 165–264 V AC at 50–60 Hz. TruPower
®
limiting ensures maximum driver protection, minimizing power com­pression while yielding high constant output under high con­tinuous and peak power conditions. The amplifier, control electronics, and power supply are contained in a single field­replaceable module located on the rear of the cabinet.
Meyer Sound’s RMS
™
remote monitoring system comes standard with all LEO-M loudspeakers and provides com­prehensive monitoring of system parameters on a Mac Windows
®
-based computer. Convenient XLR 5-pin connec-
®
or
tors allow the use of composite cables carrying both RMS and balanced audio signals.
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CHAPTER 1: INTRODUCTION
LEO-M offers intuitive rigging with captive GuideALinks™ that can be set to the desired splay angles while cabinets rest in caster frames. The MTG-LEO-M top grid flies arrays of up to 18 LEO-Ms at a 7:1 safety factor (with some restric­tions). Optional transition frames are available for flying LYONs or MICAs below LEO-M arrays for downfill. Stacks of up to four LEO-Ms can be securely transported with the optional MCF-LEO-M caster frame; durable nylon covers, accommodating stacks of two, three, or four units, are avail­able to protect the cabinets during transport.
The vented LEO-M cabinet is constructed of multi-ply hard­wood and coated with a black-textured finish. A hex­stamped, steel grille with acoustical black mesh protects the unit’s drivers. The cabinet is weather protected and includes a collapsible rain hood that shields user panel connectors from water intrusion.
MTG-LEO-M Top Grid with LEO-M Array
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MCF-LEO-M Caster Frame with Stack of Four LEO-Ms

CHAPTER 2: POWER REQUIREMENTS

!
!
Neutral
Earth/Ground
Loudspeaker
(208 V AC)
Loudspeaker
(208 V AC)
Loudspeaker
(208 V AC)
Line 1 (120 V AC)
Line 3 (120 V AC)
Line 2 (120 V AC)
Neutral
Earth/Ground
Line 1 (220 V AC)
Line 3 (220 V AC)
Line 2 (220 V AC)
Loudspeaker
(220 V AC)
Loudspeaker
(220 V AC)
Loudspeaker
(220 V AC)
!
LEO-M combines advanced loudspeaker technology with equally advanced power capabilities. Understanding power distribution, voltage and current requirements, and electrical safety guidelines is critical to the safe operation of LEO-M.

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.
CAUTION: Make sure the voltage received by
LEO-M remains within its 165–264 V AC oper­ating range. 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).
CAUTION: Before applying AC power to any
Meyer Sound self-powered loudspeaker, make sure that the voltage potential difference between the neutral and earth-ground lines is less than 5 V AC when using single-phase AC wiring.
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.

120 V AC, 3-Phase Wye System (Two Lines)

Line-Line-Earth/Ground
Figure 1 illustrates a 120 V AC, 3-phase Wye distribution system with each loudspeaker connected to two lines and a common earth/ground line. This configuration is possible because LEO-M tolerates elevated voltages from the ground line and does not require a neutral line. This system delivers 208 V AC to each loudspeaker.
Figure 1: 120 V AC, 3-Phase Wye System (Two Lines to Loudspeakers)
TIP: The 120 V AC, 3-phase Wye system with
two lines is recommended because it allows loudspeakers to draw less current than with single­line systems, thereby reducing voltage drop due to cable resistance.

220 V AC, 3-Phase Wye System (Single Line)

Line-Neutral-Earth/Ground
Figure 2 illustrates a basic 220 V AC, 3-phase Wye distribu­tion system with the loudspeaker load distributed across all three phases, with each loudspeaker connected to a single line and common neutral and earth/ground lines. This sys­tem delivers 220 V AC to each loudspeaker.
Figure 2: 220 V AC, 3-Phase Wye System (Single Line to Loudspeakers)
CAUTION: For 220 V AC, 3-phase Wye sys-
tems, never connect two lines to the AC input of LEO-M, as the resulting voltage would be higher than the allowable upper voltage range (275 V AC) and would damage the loudspeaker.
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CHAPTER 2: POWER REQUIREMENTS
L
N
PE
SIDE FRONT REAR
U.S./Canada, 60 Hz
Black (L)
Europe, 50 Hz
Green (E)
White (N)
Brown (L)
Blue (N)
Green/ yellow (E)
!

AC INPUT

The LEO-M user panel includes an AC Input connector that supplies power to the loudspeaker. The 3-conductor powerCON 32 is rated at 32 A and uses a locking connector that prevents accidental disconnections.

WIRING AC POWER CABLES

LEO-M ships with a black powerCON 32 cable mount con­nector, rated at 32 A, for assembling AC power cables. The pins on the powerCON 32 cable mount connector are labeled as follows:
■ L (Line)
■ N (Neutral)
■ PE (Protective Earth or Ground)
powerCON 32 Cable Mount Connector
How AC power cables are wired is determined by the type of AC power distribution system used (see “AC Power Distri­bution” on page 7). When wiring AC power cables for single­line systems, use one of the following wiring schemes:
powerCON 32 AC Input Connector
LEO-M ships with a black powerCON 32 cable mount con­nector, rated at 32 A, for assembling AC power cables. Make sure to use an AC power cable that is wired correctly (see “Wiring AC Power Cables” on page 8) and equipped with the appropriate power plug (on the other end) for the area in which you will operate the unit.
LEO-M requires a grounded outlet. To operate safely and effectively, it is extremely important that the entire system be properly grounded.
AC Wiring Scheme
Wire Color Attach to the
U.S. / Canada
60 Hz
Black Brown Hot or live (L)
White Blue Neutral (N)
Green Green and Yellow Protective earth /
European
50 Hz
Following
Te rm i n al
ground (E or PE)
CAUTION: When wiring AC power cables and
distribution systems, it is important to preserve AC line polarity and connect the earth ground on both ends of the cable. LEO-M requires a grounded con­nection. Always use a grounded outlet and plug. It is extremely important that the system be properly grounded to operate safely and properly. Do not ground-lift the AC cable.
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LEO-M OPERATING INSTRUCTIONS
!
!

Supported Cable Gauges for the powerCON 32

While the powerCON 32 connector supports cable gauges of 14–10 AWG (2.5–6.0 mm 10 AWG (6.0 mm
2
) should be used whenever possible.
2
), due to LEO-M’s current draw,

LEO-M VOLTAGE REQUIREMENTS

CAUTION: Due to its expanded power capabil-
ities, LEO-M was engineered to operate only at 220 V AC (208–235 V AC) to reduce current draw. Make sure to use AC power cables with sufficient gauge to operate with stable voltages during peaks and that the AC power source is capable of providing enough power.
LEO-M operates as intended when receiving AC voltage within the following range:
■ 165–264 V AC, 50–60 Hz
If the voltage drops below 165 V, the loudspeaker uses stored power to continue operating temporarily; the loud­speaker powers off if the voltage does not return to its oper­ating range.
If the voltage rises above 275 V, the power supply could become damaged.
CAUTION: To ensure that LEO-M performs as
specified, without interruption, and without damage to its power supply:
1. Its power source must operate within the required
voltage window (208–235 V AC).
2. Its AC cable length and gauge must be such that
peak voltage drops do not exceed 5 percent of its voltage.
NOTE: When voltage fluctuates within the
loudspeaker’s operating ranges, automatic tap selection stabilizes the voltage. Tap selection is instantaneous with no audible artifacts, allowing con­tinuous operation.

LEO-M CURRENT REQUIREMENTS

Current draw for loudspeakers is dynamic and fluctuates as 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.
■ 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.
■ Burst Current — The maximum rms current during a
period of around 1 second. The burst current is used as a rating for 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)
■ Maximum Instantaneous Peak Current — A rating for
fast-reacting magnetic breakers.
■ Inrush Current — The spike of initial current encoun-
tered when powering on.
You can the following table as a guide for selecting cable gauges and circuit breaker ratings for the system’s operat­ing voltage.
LEO-M Current Draw
Current Draw 230 V AC
Idle 0.6 A rms
Maximum Long­Term Continuous
Burst 8.0 A rms
Maximum Instanta­neous Peak
Inrush <15 A peak
6.0 A rms
24 A peak
The minimum electrical service amperage required by a loudspeaker system is the sum of the maximum long-term continuous current for all loudspeakers. An additional 30 percent above the minimum amperage is recommended to prevent peak voltage drops at the service entry.
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CHAPTER 2: POWER REQUIREMENTS
!
!
NOTE: For best performance, the AC cable volt-
age drop should not exceed 10 V (5 percent at 230 V). Make sure that even with AC voltage drops that the voltage always remains within the loudspeaker’s operating range.

DO NOT RESET CIRCUIT BREAKERS!

CAUTION: In the unlikely event that one of
LEO-M’s circuit breakers trips (the center but­ton disengages), disconnect the AC power cable and contact Meyer Sound for repair information. DO NOT attempt to reset the breaker or reconnect the AC power cable.

INTELLIGENT AC POWER SUPPLY

LEO-M’s Intelligent AC™ power supply eliminates high inrush currents with soft-start power up; suppresses high­voltage transients up to several kilovolts; filters common mode and differential mode radio frequencies (EMI); and sustains operation temporarily during low-voltage periods.

ELECTRICAL SAFETY GUIDELINES

Make sure to observe the following important electrical and safety guidelines.
■ The powerCON 32 connector should not be engaged or
disengaged when under load or live.
■ LEO-M 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.
■ Make sure the AC power cable for the loudspeaker has the
appropriate power plug (on the other end) for the area in which you will operate the loudspeaker.
■ Do not operate the unit if the power cable is frayed or
broken.
■ Keep all liquids away from LEO-M loudspeakers to avoid
hazards from electrical shock.
■ Use the cable rings (see “Cable Rings” on page 12) on
the rear of the LEO-M cabinet to reduce strain on the AC power cable (and audio cables). Do not use the cable rings for any other purpose.

Powering on LEO-M

When powering on LEO-M, the following startup events take place over several seconds.
1. Audio output is muted.
2. The primary fan turns on.
3. The power supply ramps up.
4. On the user panel, the Active LED turns solid green, indi­cating the loudspeaker is ready to output audio.
CAUTION: If the Active LED does not turn solid
green, or LEO-M does not output audio after 10 seconds, remove AC power immediately and ver­ify that the voltage is within the required range. If the problem persists, contact Meyer Sound Technical Support.
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