OPERATING INSTRUCTIONS M SERIES MILO High-Power Curvilinear Array Loudspeaker Keep these important operating instructions. Check www.meyersound.com for updates.
DECLARATION OF CONFORMITY ACCORDING TO ISO/IEC GUIDE 22 AND EN 45014 Manufacturer's Name: Meyer Sound Laboratories Inc.
SYMBOLS USED These symbols indicate important safety or operating features in this booklet and on the chassis: ! Dangerous voltages: risk of electric shock Important operating instructions Frame or chassis Protective earth ground Pour indiquer les risques résultant de tensions dangereuses Pour indequer important instructions Masse, châssis Terre de protection Zu die gefahren von gefährliche spanning zeigen Zu wichtige betriebsanweisung und unterhaltsanweisung zeigen Rahmen oder chassis Die schut
SAFETY SUMMARY English - - - - - - To reduce the risk of electric shock, disconnect the loudspeaker from the AC mains before installing audio cable. Reconnect the power cord only after making all signal connections. Connect the loudspeaker to a two-pole, three-wire grounding mains receptacle. The receptacle must be connected to a fuse or circuit breaker. Connection to any other type of receptacle poses a shock hazard and may violate local electrical codes.
CONTENTS INTRODUCTION 1 How to Use this Manual Introducing MILO Integrated Amplifier and Processing Advanced M Series Technology 1 1 2 3 CHAPTER 1: Power Requirements 5 AC Power AC Power Distribution Voltage Requirements Current Requirements Power Connector Wiring Conventions Electrical Safety Issues 5 5 5 6 7 8 CHAPTER 2: Amplification and Audio Audio Input Amplification and Protection Circuitry MILO Interconnections Cabling The TruPower™ Limiting System Low- and Mid-Frequency Limiters High-Frequen
MILO and the 650-P Subwoofer Daisy-Chained Adding an LD-1A/LD-2 Line Driver Adding an LD-3 Line Driver Digital Signal Processors Meyer Sound MAPP Online® CHAPTER 5: SIM® System SIM Measurement system Source Independent Measurement Technique Applications APPENDIX A: Amplifier Replacement and Weather Protection Using the Rain Hood (Weather-Protected Loudspeakers) Removing and Replacing the HP-4/MILO Amplifier Replacing the HP-4/MILO Amplifier Removing and Replacing the HP-4/MILO Amplifier (Weather- Protecte
INTRODUCTION INTRODUCTION HOW TO USE THIS MANUAL As you read this manual, you’ll find figures and diagrams to help you understand and visualize what you’re reading. You’ll also find numerous icons that serve as cues to flag important information or warn you against improper or potentially harmful activities. These icons include: A NOTE identifies an important or useful piece of information relating to the topic under discussion.
INTRODUCTION the cabinet corners couple the units for either flying or stacking, and allow nine positions from 0° to 5° of cabinet splay (0°, 0.5°, 1°, 1.5°, 2°, 2.5°, 3°, 4° and 5°). Because rigging connections are rigid, the array tilt is easy to adjust – often eliminating the need for a pullback strap in flown configurations. If circumstances dictate an acute array curve, then a PBF-MILO pull back frame can be attached to the lowest cabinet.
INTRODUCTION ADVANCED M SERIES TECHNOLOGY MILO was created specifically as a modular, flexible design solution for high-power systems in medium to large venues. In size and weight, MILO fits into the M Series between the M3D and the M2D; in output power and operating frequency range, it scales more closely to the M3D. The MILO loudspeaker is a four-way design.
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CHAPTER 1 CHAPTER 1: POWER REQUIREMENTS Self-powered and highly mobile, MILO is advanced loudspeaker technology with equally advanced power capabilities. Understanding MILO’s power distribution, voltage and current requirements, as well as electrical safety issues, is critical to the safe and correct operation and deployment of MILO. for the same output power compared to operating MILO from 120 V AC (Line- Neutral).
CHAPTER 1 NOTE: Refer to Appendix B for details on the MILO loudspeaker’s AC voltage requirements. After applying AC power, the proper operating voltage is automatically selected, but the system is muted. During the next three seconds the following events occur: 1. The primary fans turn on. 2. The main power supply slowly ramps on. 3. The green Active LED on the user panel lights up, indicating that the system is enabled and ready to pass audio signals.
CHAPTER 1 The minimum electrical service amperage required by a MILO system is the sum of each loudspeaker’s maximum long-term continuous current. An additional 30 percent above the minimum amperage is recommended to prevent peak voltage drops at the service entry. CAUTION: In the unlikely event that the circuit breakers trip (the white center buttons pop out), disconnect the AC power cable. Do not reset the breakers with the AC connected. Contact Meyer Sound for repair information.
CHAPTER 1 ELECTRICAL SAFETY ISSUES Pay close attention to these important electrical and safety issues. CAUTION: Do not use a power cord adapter to drive the MILO loudspeaker from a standard three-prong Edison outlet since that connector is rated for only 15 amps (NEMA 5-15R; 125 V AC max.). ! CAUTION: The MILO loudspeaker requires a ground connection. Always use a grounded outlet and plug.
CHAPTER 2 CHAPTER 2: AMPLIFICATION AND AUDIO More than just a self-powered loudspeaker, MILO uses sophisticated amplification and protection circuitry and an advanced limiting system to produce consistent and predictable results in any system design. This chapter will help you understand and harness the power of MILO’s amplifier and audio systems.
CHAPTER 2 Meyer Sound LD-1A, LD-2, or LD-3 line drivers are highly recommended when driving systems using multiple loudspeakers. These line drivers, in addition to maintaining signal integrity for long cable paths, offer independent outputs and filters to help you integrate sub-systems and optimize MILO array performance. Very High Mid-High NOTE: For details on MILO’s audio input characteristics and amplification, see Appendix B.
CHAPTER 2 CAUTION: The strain relief stud fitting must ! be used only to secure system cabling. This fitting is not intended to be used with system rigging or a pull-back motor (pulling the bottom of the array backward to increase downward tilt). The point is mounted to the side of the amplifier area so as not to interfere with the rain hood (if fitted) and the amplifier fan exhaust area.
CHAPTER 2 NOTE: The limit LEDs indicate when the safe power level is exceeded. If any channel on an entire system of MILO loudspeakers begins to limit before reaching the required sound pressure level (SPL), consider adding more loudspeakers to satisfy the SPL requirements without exposing the drivers on that channel to excessive heat and/or excursion. Two variable-speed primary fans run continuously and inaudibly at their slowest speed.
CHAPTER 3 CHAPTER 3: RMS REMOTE MONITORING SYSTEM MILO is RMS-ready and fitted standard with an RMS communication board installed in its HP-4/MILO amplifier. RMS is a real-time monitoring system that connects Meyer Sound self-powered loudspeakers with a Windows-based PC at the sound mix position or other location. Optional RMS software delivers extensive status and system performance data from every installed loudspeaker.
CHAPTER 3 Service Button USER INTERFACE Pressing the Service Button will display an icon on the corresponding loudspeaker display on the RMS screen. When used in combination with the Reset Button, the card will be decommissioned from the network and the red Service LED will blink. The RMS software features an intuitive, graphical Windows user interface.
CHAPTER 4 CHAPTER 4: LINE ARRAYS AND SYSTEM INTEGRATION A line array, in the most basic sense, is a group of closely spaced loudspeakers arrayed in a straight line, operating with equal amplitude and in phase. Although line arrays have been used since the 1950s, line array systems that provide full bandwidth directivity are relatively new to the sound reinforcement industry. HOW LINE ARRAYS WORK Line arrays achieve directivity through constructive and destructive interference.
CHAPTER 4 12 MILO Cabinets 24 MILO Cabinets 250 Hz 12 MILO Cabinets With two different technologies (low-frequency cone radiators and high-frequency wave guide) built into each MILO cabinet, achieving these goals becomes a multi-step process, with different strategies for the lower and higher frequencies for long throws and short throws.
CHAPTER 4 a correction to compensate for energy lost over distance; the correction needed is usually proportional to the distance and high frequency air absorption. In the near- to mid-field, the air absorption is not nearly as critical; in this zone, high frequencies need little or no additional correction. Figures 4.2 shows a series of MAPP Online predictions based on an example MILO system design.
CHAPTER 4 and subwoofers (not in the MAPP Online predictions). Equalizers for each zone, as well as digital delays, provide a time adjustment to compensate for the various sub-systems if they are geometrically out of plane. CAUTION: This example is not meant to be used as a template for your own system designs. Acoustical characteristics, physical constraints, audio content, audience, and other relevant factors should always be uniquely weighed into your own applications on a per-project basis.
CHAPTER 4 towards the stage to keep them in phase at both the mix position and throughout the total array coverage. Similarly, when M3D-Subs are stacked on the floor below your MILO array, they may be several feet closer than the MILO array through most of the coverage, keeping them in phase (provided the distance is 4 feet or less with the M3DSubs being closer).
CHAPTER 4 MILO and the 650-P Subwoofer In applications where M3D-Sub features like directional lowfrequency control and additional peak SPL are not needed, a MILO array can be deployed in combination with Meyer Sound 650-P subwoofers. The 650-P subwoofer extends the MILO system frequency response down to 30 Hz; MILO and the 650-P can accommodate three basic connection options.
CHAPTER 4 Table 4.1 LD-1 / LD-2 “Lo-Cut Filter” Parameters Type Order Pole Frequency Q High Pass 2nd (-12 dB/oct) 162 Hz 1.82* Figure 4.7. The LD-3 air attenuation compensating line driver NOTE: The LD-3 utilizes multiple-variable atmospheric loss equations and precalculated MAPP Online stored values to provide frequency response correction quickly and efficiently (up to 16 kHz at a resolution down to 1 dB).
CHAPTER 4 You can find MAPP Online at: www.meyersound.com/products/software/mapponline NOTE: In order to use MAPP Online, you will need to register by clicking “Apply for MAPP Online” on the Web page listed above. After registration and upon approval, an e-mail will be sent to you with a username and password along with the address for the Web page where you can download MAPP Online. Online instructions will guide you through the download and setup process.
CHAPTER 5 CHAPTER 5: SIM® SYSTEM SIM MEASUREMENT SYSTEM SIM can also be used in the following applications: SIM is a measurement and instrumentation system including a selection of hardware and software options, microphones and accessory cables.
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APPENDIX A APPENDIX A: AMPLIFIER REPLACEMENT AND WEATHER PROTECTION USING THE RAIN HOOD (WEATHERPROTECTED LOUDSPEAKERS) REMOVING AND REPLACING THE HP-4/MILO AMPLIFIER If your MILO loudspeaker was ordered with optional weather protection, a rain hood is installed on the MILO loudspeaker. It is provided to protect the loudspeaker’s electronics from direct exposure to rainfall. Before using the MILO loudspeaker, open the rain hood as described in the following procedure.
APPENDIX A Replacing the HP-4/MILO Amplifier To replace the MILO’s HP-4 amplifier, do the following: 1. Gently slide the amplifier partially back into the MILO and connect the two loudspeaker connectors. Make sure they are connected properly. The harness with red and black wires goes to the connector closest to the user panel, while the harness with green and white cables goes to the connector closest to the fans. 2. Start all eight screws into the holes before tightening them. 3.
APPENDIX B APPENDIX B MILO SPECIFICATIONS ACOUSTICAL Note: The low-frequency power response of the system will increase according to the length of the array. Operating frequency range 60 Hz - 18 kHz Note: Recommended maximum operating frequency range. Response depends upon loading conditions and room acoustics. Free field frequency response 65 Hz - 17.5 kHz ±4 dB Phase response 750 Hz - 16 kHz ±30° Maximum peak SPL 140 dB @ 1 m Note: Measured with 1/3 octave frequency resolution at 4 meters.
APPENDIX B AUDIO INPUT Type Differential, electronically balanced Max.
APPENDIX B PHYSICAL Enclosure Multi-ply hardwood Finish Black textured Protective grille Powder-coated hex stamped steel Rigging QuickFly MRF-MILO rigging frame, custom AlignaLink connectors and quick release pins Dimensions 54.00” W x 14.47” H x 22.00” D (1372 mm x 368 mm x 559 mm) Weight 235 lbs (106.
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Meyer Sound Laboratories, Inc. 2832 San Pablo Avenue Berkeley, CA 94702 USA T: +1 510 486.1166 F: +1 510 486.8356 techsupport@meyersound.com www.meyersound.com © 2003 Meyer Sound Laboratories, Inc.
