OPERATING INSTRUCTIONS M SERIES MILO 120 High-Power Expanded Coverage 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. Manufacturer's Address: 2832 San Pablo Avenue Berkeley, CA 94702-2204, USA declares that the products Product Name: MILO 120 Loudspeaker conforms to the following Product Specifications Safety: EN60065: 1998 IEC60065: 1998 EMC: EN55103-1: 1997 emission1 EN55103-2: 1997 immunity2 This device also complies with EN 55103-1 & -2.
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 schutze
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 How to Use this Manual CHAPTER 1: Introducing the MILO 120 Loudspeaker 1 1 3 Rigging and Transport Integrated Amplifier and Processing Advanced M Series Technology 4 5 5 CHAPTER 2: Power Requirements 7 AC Power Voltage Requirements AC Power Distribution Current Requirements Power Connector Wiring Conventions Electrical Safety Issues 7 7 7 8 9 10 CHAPTER 3: Amplification and Audio Audio Input Amplification and Protection Circuitry MILO 120 Interconnections Cabling The TruPower® L
Using MILO/MILO 120 with Subwoofers MILO/MILO 120 and the M3D-Sub MILO/MILO 120 and the 700-HP Subwoofer Digital Signal Processors CHAPTER 6: System Design and Integration Tools Meyer Sound MAPP Online® SIM Measurement System Source Independent Measurement Technique Applications CHAPTER 7: QuickFly® Rigging MILO 120 Custom AlignaLinks MILO 120 As Downfill in MILO/MILO 120 Curvilinear Arrays MG-3D/M Multipurpose Grid MCF-MILO Caster Frame APPENDIX A: Amplifier Replacement and Optional Rain Hood Using the Ra
INTRODUCTION INTRODUCTION These operating instructions provide important information about the form, features, function and specifications of the MILO 120 high-power expanded coverage curvilinear array loudspeaker. In addition to power requirements and audio characteristics, fundamental line array design, useful software tools and rigging options for the MILO 120 loudspeaker are discussed.
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CHAPTER 1 CHAPTER 1: INTRODUCING THE MILO 120 LOUDSPEAKER A variation on the popular MILO high-power curvilinear loudspeaker, the MILO 120 high-power expanded coverage curvilinear array loudspeaker excels where wide horizontal and increased vertical coverage are needed. Figure 1.1. MILO 120 high-power expanded coverage curvilinear array loudspeaker Figure 1.2.
CHAPTER 1 In addition, by integrating Meyer Sound M3D-Sub directional subwoofers (Figure 1.4) with a MILO/MILO-120 system (MILO, MILO 120 and M3D/M3D-Sub cabinets are identical in width), you can easily augment bass power with real depth while extending low-frequency bandwidth and headroom. RIGGING AND TRANSPORT MILO 120’s QuickFly rigging employs rugged, reliable and user-friendly components that remain captive in transit.
CHAPTER 1 INTEGRATED AMPLIFIER AND PROCESSING As a self-powered loudspeaker, MILO 120 incorporates a very high power, 4-channel, class AB/H power amplifier and sophisticated control circuitry — all housed within the cabinet — dramatically simplifying setup and installation. MILO 120’s on-board amplifier delivers 3560 watts total burst power.
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CHAPTER 2 CHAPTER 2: POWER REQUIREMENTS The self-powered MILO 120 is advanced loudspeaker technology with equally advanced power capabilities. Understanding MILO 120’s power distribution, voltage and current requirements, as well as electrical safety issues, is critical to the safe and correct operation and deployment of the MILO 120 loudspeaker.
CHAPTER 2 NOTE: Refer to Appendix B for details on the MILO 120 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. NOTE: It is recommended that the supply be operated in the rated voltage windows at least a few volts away from the turn on/off points.
CHAPTER 2 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 on the user panel 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. POWER CONNECTOR WIRING CONVENTIONS The MILO 120 loudspeaker requires a grounded outlet.
CHAPTER 2 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 120 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 120 loudspeaker requires a ground connection. Always use a grounded outlet and plug.
CHAPTER 3 CHAPTER 3: AMPLIFICATION AND AUDIO More than just a self-powered loudspeaker, MILO 120 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 120’s amplifier and audio systems. Audio signals can be daisy-chained using the loop output connector on the user panel of the MILO 120 loudspeaker (Figure 3.1).
CHAPTER 3 ��������� NOTE: Meyer Sound 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/MILO 120 array performance. �������� NOTE: For details on audio input characteristics and amplification, see Appendix B.
CHAPTER 3 To utilize the strain relief fitting, insert the signal, data, and AC connections into each loudspeaker as the array is being rigged (swag all cables under the optional rain hood’s side flaps if installed), and tie the cables off to the ring/stud fitting, as shown in Figure 3.3. The actual power is monitored for three of MILO 120’s four amplifier channels. When the safe continuous power level is exceeded, the TruPower limiter controlling that amplifier channel engages.
CHAPTER 3 Very-High Frequency Limiters FANS AND COOLING SYSTEM The two 2-inch diaphragm very-high frequency compression drivers are powered by the fourth amplifier channel. The VHF limiter prevents excessive continuous voltages and signal peaks from causing excessive heat and excursion in the drivers as well as distortion in the amplifier channel. The limiter also helps preserve headroom and maintain smooth frequency response at high levels.
CHAPTER 3 Two variable-speed primary fans run continuously and inaudibly at their slowest speed. The primary fans increase speed when either of the two heatsinks reaches 42˚ C. The fans reach full speed at 62˚ C and are still barely audible even near the cabinet, and without an audio signal. In the unusual event that the heatsink temperature reaches 74˚ C, the secondary fans turn on and are clearly audible without an audio signal.
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CHAPTER 4 CHAPTER 4: RMS REMOTE MONITORING SYSTEM 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. MILO 120 is RMS-ready and fitted standard with an RMS communication board installed in its HP-4/MILO 120 amplifier.
CHAPTER 4 Service LED (Red) USER INTERFACE The Service LED blinks every two seconds to indicate that the network hardware is operational, but the loudspeaker is not installed (commissioned) on the network. When a loudspeaker has been installed on the network the, Service LED will be unlit and the Activity LED will flash continuously. The RMS software features an intuitive, graphical Windows user interface.
CHAPTER 5 CHAPTER 5: 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 precise directivity are relatively new to the sound reinforcement industry. HOW LINE ARRAYS WORK Line arrays achieve directivity through constructive and destructive interference.
CHAPTER 5 Mid to Low Frequencies For the mid to low frequencies, line arrays must be coupled to narrow their vertical coverage and project mid and low energy to the far field. The directional control of the array is achieved when the length of the array is similar to or larger than the wavelength of the frequencies being reproduced by the array.
CHAPTER 5 High-Frequency Design Strategies Electronically Driving the Array Planning for high-frequency coverage is a matter of deciding the number and type of elements and fine-tuning the splay angles between cabinets. The number of elements does not necessarily have a significant impact on SPL at high frequencies (it will at low frequencies), but can profoundly affect vertical coverage and throw capabilities of the array.
CHAPTER 5 Equalizers for each zone, as well as digital delays, provide frequency and time adjustment to compensate for the various sub-systems if they are geometrically out of plane. For example, flown array and ground-stacked subs. 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 5 NOTE: The LD-3 utilizes multiple-variable atmospheric loss equations and pre-calculated MAPP Online stored values to provide frequency response correction quickly and efficiently (up to 16 kHz at a resolution down to 1 dB). Its high-quality, digitally-controlled analog filters provide the best of both worlds: the low latency and wide dynamic range of analog and the nimble, precise, repeatable results of digital.
CHAPTER 5 The M3D-Sub has advantages over other subwoofers due to its unique low-frequency directional control and its ability to be vertically arrayed with MILO/MILO 120 since they share the same width. NOTE: For most applications, you want to keep low frequencies from being produced behind the array to reduce or eliminate the low frequency reverberant noise traditionally associated with large-scale, full range loudspeaker arrays.
CHAPTER 5 Digital Signal Processors Full-range signals may be applied to Meyer Sound’s selfpowered loudspeakers because they have built-in active crossover circuits; external crossovers and digital signal processors (DSP) are optional and should be used very carefully due to phase shifts that can cause cancellations. If DSP is used, both MILO 120 loudspeakers and subwoofers should be fed from the same DSP in order to keep their delay time the same.
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CHAPTER 6 CHAPTER 6: SYSTEM DESIGN AND INTEGRATION TOOLS Meyer Sound offers two comprehensive tools to assist you with the acoustical and functional requirements of system design and optimization. This chapter introduces you to Meyer Sound MAPP Online — a powerful online acoustical prediction tool — and the SIM audio analyzer, a robust instrumentation package for system measurement, analysis, and more. MEYER SOUND MAPP ONLINE MAPP Online (Figure 6.
CHAPTER 6 SIM MEASUREMENT SYSTEM Applications SIM is a measurement and instrumentation system including a selection of hardware and software options, microphones and accessory cables. The SIM audio analyzer is optimized for making audio frequency measurements of an acoustical system with a resolution of up to 1/24 of an octave; the high resolution enables you to apply precise electronic corrections to adjust system response using frequency and phase (time) domain information.
CHAPTER 7 CHAPTER 7: QUICKFLY RIGGING MILO 120 features Meyer Sound’s QuickFly rigging system with rugged, reliable and simple components. QuickFly facilitates flying or ground stacking MILO 120 loudspeakers in a variety of applications. CAUTION: All Meyer Sound products must be used in accordance with local, state, federal and industry regulations. It is the owner’s and/or user’s responsibility to evaluate the reliability of any rigging method for their application.
CHAPTER 7 The front AlignaLinks include two sets of holes: The top set is used for rigging while the bottom set is for securing the optional MILO 120-I insert (Figures 7.3 and 7.4). This position can also be used when transporting cabinets with the MCF-MILO caster frame, as shown in Figure 7.5. Front hole not used Figure 7.5. Front AlignaLinks in transport position NOTE: The front rigging hole in the rigging frame is not used when the MILO 120 front Alignalink is employed. Figure 7.3.
CHAPTER 7 MG-3D/M MULTIPURPOSE GRID MCF-MILO CASTER FRAME The MG-3D/M multipurpose grid supports flying and ground stacking multiple MILO/MILO 120 loudspeakers and/or M3D line array loudspeakers (or M3D-Subs) in numerous configurations (Figure 7.6). The MCF-MILO caster frame (Figure 7.7) allows you to transport stacks of up to four MILO/MILO 120 cabinets, using the MILO 120 AlignaLinks to secure the cabinets to the caster frame.
CHAPTER 7 Figures 7.8, 7.9 and 7.10 show example transport configurations using the MILO 120 AlignaLinks. Bottom (transport) position T0 Top (rigging) position T6 17 / MCF Bottom (transport) position Bottom (insert/ transport) position Figure 7.9. Configuration for transporting cabinets on the MCF-MILO caster frame using the MILO 120 AlignaLinks to achieve a splay of 0 degrees between cabinets and between the last cabinet and the caster frame. 17 / MCF Bottom (transport) position Figure 7.8.
APPENDIX A APPENDIX A: AMPLIFIER REPLACEMENT AND OPTIONAL RAIN HOOD USING THE RAIN HOOD (WEATHER-PROTECTED LOUDSPEAKERS) If your MILO 120 loudspeaker was ordered with optional weather protection, a rain hood is installed on the MILO 120 loudspeaker. It is provided to protect the loudspeaker’s electronics from direct exposure to rainfall. Before using the MILO 120 loudspeaker, open the rain hood as described in the following procedure. 1. Pull the exterior Velcro straps off the hood to allow it to open.
APPENDIX A Replacing the HP-4/MILO 120 Amplifier To replace MILO 120’s HP-4 amplifier, do the following: 1. Gently slide the amplifier partially back into MILO 120 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 120 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 138 dB Note: Measured with 1/3-octave frequency resolution at 4 meters.
APPENDIX B AUDIO INPUT Type Differential, electronically balanced Max.
APPENDIX B PHYSICAL: MILO 120 Loudspeaker Enclosure Multi-ply hardwood Finish Black textured Protective grille Powder-coated hex stamped steel Rigging QuickFly MRF-MILO rigging frame, MILO 120 AlignaLink connectors and 3/8” x 1.125” 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 www.meyersound.com T: +1 510 486.1166 F: +1 510 486.8356 © 2004 Meyer Sound Laboratories Inc. 05.142.003.
