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Summary of Contents for Meyer Sound 750-LFC
- Page 1 OPERATING INSTRUCTIONS 750-LFC Compact Low-Frequency Control Element Keep these important operating instructions. Check www.meyersound.com for updates.
- Page 2 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...
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Page 3: Table Of Contents
CONTENTS Chapter 1: Introduction How to Use This Manual 750-LFC Compact Low-Frequency Control Element Native Mode Optimal Mid-High Loudspeaker to Subwoofer Ratio Chapter 2: Power Requirements AC Power Distribution AC Connectors Wiring AC Power Cables 750-LFC Voltage Requirements 750-LFC Current Requirements... - Page 4 CONTENTS...
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Page 5: Chapter 1: Introduction
Meyer Sound loudspeaker systems, including LEOPARD ™ and ULTRA Series loudspeakers. LINA and 750-LFC can be driven by Meyer Sound’s Galileo GALAXY ™ array processors, which provides matrix routing, alignment, and processing for array components. To guaran- tee optimum performance, systems with the 750-LFC should be designed with Meyer Sound’s MAPP... -
Page 6: Native Mode
The simplest way to accomplish this is by looping the angles from 0 to 5 degrees. The 750-LFC can be configured same, unprocessed source signal through all array elements. in cardioid arrays to reduce output behind the loudspeakers. - Page 7 750-LFC OPERATING INSTRUCTIONS Source Audio Figure 6: Mixed Groundstack (ratio 2:2) NOTE: Native mode should not be used with Source Audio more advanced configurations, such as those Figure 4: Flown Mixed Array (ratio 3:1) where 750-LFCs and LINAs are not coplanar, or those requiring delay offsets to align subsystems or to cre- ate directional low-frequency control.
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Page 8: Optimal Mid-High Loudspeaker To Subwoofer Ratio
CHAPTER 1: INTRODUCTION OPTIMAL MID-HIGH LOUDSPEAKER TO SUB- WOOFER RATIO The ideal ratio of mid-high loudspeakers to 750-LFC sub- woofers depends on the following: ■ Loudspeaker model ■ System configuration ■ Frequency content of source material ■ Headroom required for low frequencies For LINA applications, the ratios shown in the figures above yield good results. -
Page 9: Chapter 2: Power Requirements
This configuration is possible CAUTION: Before applying AC power to any because the 750-LFC tolerates elevated voltages from the Meyer Sound self-powered loudspeaker, make ground line and does not require a neutral line. This system sure that the voltage potential difference between the delivers 208 V AC to each loudspeaker. -
Page 10: Ac Connectors
Delta connection. Connecting two AC Input of the second loudspeaker, and so forth. lines to the AC input of the 750-LFC exceeds the The maximum number of loudspeakers that can be looped allowable upper voltage range (275 V AC) and will from the AC Loop Output connector is determined by the damage the loudspeaker. -
Page 11: Wiring Ac Power Cables
750-LFC OPERATING INSTRUCTIONS WIRING AC POWER CABLES 750-LFC VOLTAGE REQUIREMENTS The pins on the gray powerCON 20 cable mount connector The 750-LFC operates as intended when receiving AC volt- are labeled as follows: age within the following range: ■ L (Line) ■... -
Page 12: Intelligent Ac Power Supply
If the On/Status LED does not turn Idle 0.39 A rms 0.38 A rms 0.42 A rms solid green, or the 750-LFC does not output Maximum Long-Term audio after 10 seconds, remove AC power immedi- 5.3 A rms 2.7 A rms 6.2 A rms... -
Page 13: Electrical Safety Guidelines
■ Use the cable rings (see “Cable Rings” on page 16) on the rear of the 750-LFC cabinet to reduce strain on the AC power cable (and audio cables). Do not use the cable rings for any other purpose. - Page 14 CHAPTER 2: POWER REQUIREMENTS...
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Page 15: Chapter 3: Amplification And Audio
Figure 10: 750-LFC User Panel (XLR 5-pin version) for audio frequencies while allowing unwanted signals to The 750-LFC user panel includes Input and Loop output con- bleed to ground. Make sure to use balanced XLR audio nectors for audio, Limit and On/Status LEDs, and RMS con- cables with pins 1–3 connected on both ends. -
Page 16: Cable Rings
Calculating Load Impedance for Looped Audio CABLE RINGS Signals Two cable rings are provided on the rear of the 750-LFC To avoid distortion when looping multiple loudspeakers, cabinet. Power and audio cables should be tied off to the make sure the source device can drive the total load imped- rings to reduce strain on the cables and prevent damage to ance of the looped loudspeakers. -
Page 17: Amplifier Cooling System
LF Limit LED lights on the user panel (the HF Limit LED is high output levels, an ultra low-noise, variable-speed fan cir- disabled for the 750-LFC). culates air internally to keep the 750-LFC at a safe operating temperature. CAUTION: To prevent the 750-LFC from over- heating, allow at least 6 in behind the loud- speaker for proper ventilation. - Page 18 CHAPTER 3: AMPLIFICATION AND AUDIO...
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Page 19: Chapter 4: Quickfly Rigging
750-LFC RIGGING OPTIONS Table 2 summarizes the available rigging options for the 750-LFC. For complete information on rigging hardware, including dimensions, weight, configuration, and load ratings, refer to the MG-LINA/750 Assembly Guide (PN 05.270.101.01) available at www.meyersound.com. - Page 20 CHAPTER 4: QUICKFLY RIGGING Rigging Example, Mixed Array with 750-LFCs and LINAs MG-MINA/LINA/750 Multipurpose Grid Fitted with GLK for improved load rating when hanging 750-LFCs (2) 750-LFCs Low-frequency enhancement (6) LINAs Primary array coverage...
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Page 21: Groundstacking 750-Lfc Loudspeakers
MRK-750 rigging kit. Protective plastic skids The loudspeaker’s linearity ensures that cardioid patterns are included on the bottom of the 750-LFC cabinet that align behave accurately even at very high levels. Cardioid arrays are with the slots on the cabinet top. Units can be stacked nor- achieved by placing three units coplanar to each other (in mally or reversed for cardioid configurations. -
Page 22: 750-Lfc Guidealinks
LINAS from it. We recommend NOT using the middle link to Located at the bottom of the cabinet, GuideALinks drop hang the 750-LFC because its load rating is about half of its down and into the link slots of the cabinet below it. GuideA- maximum capability. - Page 23 Do not use the rear/middle GuideA- Links when flying the 750-LFC below the MG- The 750-LFC’s four corner link slots on the top of the cabi- MINA/LINA/750 grid or when flying below another net accept GuideALinks from flown 750-LFCs. The front and 750-LFC.
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Page 24: Pole-Mount Receptacle
The following Meyer Sound loudspeakers can be mounted directionality for low-frequency content. The on top of the 750-LFC. Make sure that the pole and pole- curved array capability of the 750-LFC is provided only mount adapter can support the weight of the mounted loud-... -
Page 25: Mcf 750 Caster Frame
The MCF-750 is highly durable and easy to attach to 750- LFC subwoofers, making it easy to assemble or disassem- ble by using blocks of up to three 750-LFC subwoofers. The heavy-duty MCF-750 caster frame has two options (shown below): ■... - Page 26 CHAPTER 4: QUICKFLY RIGGING Figure 24: Three 750-LFCs without rigging on a dolly secured by a strap NOTE: For safety reasons and to avoid any damage to the enclosures, use straps when transporting a stack if the cabinets are not fitted with the MRK-750 rigging kit.
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Page 27: Chapter 5: Remote Monitoring System (Rms) Option
Conversely, a loud- usage for multiple Meyer Sound loudspeakers from a Mac or speaker can be identified in Compass RMS by pressing the Windows-based computer. The RMS host computer com- Identify button on the loudspeaker’s RMS module. -
Page 28: Neuron Id For Rms Module
Compass or press the Identify button on the RMS user RESETTING THE RMS MODULE panel), the LED lights solid green until the loudspeaker is You can use the Identify button to reset the 750-LFC RMS unwinked. module when powering on the loudspeaker. This will cause the module to be removed from the RMS network. -
Page 29: Chapter 6: System Design And Integration Tools
CHAPTER 6: SYSTEM DESIGN AND INTEGRATION TOOLS This chapter introduces MAPP, Meyer Sound’s patented sys- MAPP client software lets you configure Meyer Sound loud- tem design tool, and SIM 3, a comprehensive system for speaker systems and define the environment in which they measurement and analysis. -
Page 30: Sim 3 Measurement System
Optimizing subwoofer integrations Source Independent Measurement Technique ■ Optimizing loudspeaker arrays The SIM 3 audio analyzer implements Meyer Sound’s source independent measurement technique, a dual-channel SIM 3 can also be used in the following applications: method that accommodates statistically unpredictable exci- ■... -
Page 31: Appendix A: Rain Hoods
3. Make sure to tighten the screws to create a good seal against the user panel. 750-LFC FOLDABLE RAIN HOOD The 750-LFC foldable rain hood is installed on the unit when shipped. Four screws secure its frame permanently. To use the 750-LFC foldable rain hood: 1. - Page 32 APPENDIX A: RAIN HOODS...
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Page 33: Appendix B: 750-Lfc Dimensions
M20 thread at the bottom 554mm 21.8in 478mm 18.8in 530mm 20.9in 515mm 20.3in 279mm 11.0in 248mm 9.8in .2in 750-LFC dimensions without rigging 601.2mm 23.67in 70.9mm 530mm 2.79in 20.9in 279mm 11.0in 248mm 9.8in .2in 750-LFC W/P dimensions without rigging and rainhood installed... - Page 34 20.88in 277mm 10.90in 251mm 9.88in .25in 750-LFC W/P dimensions with rigging and rainhood installed NOTE: For dimensions and weight for the MG-LINA top grid and MCF-750 caster frame, refer to the MG-LINA/ 750 Assembly Guide (PN 05.270.101.01) available at www.meyersound.com.
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Page 35: Appendix C: 750-Lfc Specifications
APPENDIX C: 750-LFC SPECIFICATIONS Loudspeaker system predictions for coverage and SPL are available in Meyer Sound’s MAPP prediction software, which can be found on the Meyer Sound website: http://www.meyersound.com. ACOUSTICAL 35 Hz – 125 Hz Operating Frequency Range Note: Recommended maximum operating frequency range. - Page 36 APPENDIX C: 750-LFC SPECIFICATIONS AMPLIFIER Type 2-channel, open-loop, class D Cooling Convection AC POWER Connectors powerCON 20 input with loop output Safety Rated Voltage Range 100–240 V AC, 50–60 Hz Turn-on/off Points Turn-on: 90 V AC; Turn-off: none; internal fuse protection above 265 V AC...
- Page 37 750-LFC OPERATING INSTRUCTIONS Federal Communications Commission (FCC) Statement This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
- Page 38 APPENDIX C: 750-LFC SPECIFICATIONS...
- Page 39 Meyer Sound Laboratories Inc. © 2018 2832 San Pablo Avenue Meyer Sound. All rights reserved. Berkeley, CA 94702 750-LFC Operating Instructions +1 510 486.1166 PN 05.271.005.01 B www.meyersound.com...