OPERATING INSTRUCTIONS M3D™ Line Array Loudspeaker M3D-Sub Directional Subwoofer M SERIES
DECLARATION OF CONFORMITY ACCORDING TO ISO/IEC GUIDE AND EN 45014 The Manufacturer: Meyer Sound Laboratories, Inc. 2832 San Pablo Avenue Berkeley, California 94702-2204, USA Declares that the product: M3D™, M3D-Sub Conforms to the following Product Specifications Safety: EN60065: 1998 IEC60065: 1998 EMC: EN55103-1: 1997 emission(1) EN55103-2: 1997 immunity(2) This device complies with the requirements of the Low Voltage Directive 73 / 23 / EEC and the EMC Directive 89 /336 / EEC.
SYMBOLS USED These symbols indicate important safety or operating features in this booklet and on the chassis.
SAFETY SUMMARY English Deutsch – 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 AC Power AC Power Distribution Voltage Requirements Current Requirements Power Connector Wiring Conventions Safety Issues Audio Input Amplification and Protection Circuitry M3D Interconnections M3D-Sub Interconnections The TruPower™ Limiting System M3D TPL Limiters M3D Peak Limiter M3D-Sub TPL Limiters M3D-Sub Excursion Clamp Fans and Cooling System Using and Replacing the Rain Hood Opening the Rain Hood Removing the M3D/M3D-Sub Amplifier Replacing the M3D/M3D-Sub Amplifier How Do Line
Operating Instructions M3D™ Line Array INTRODUCTION The M3D Line Array is a part of the Meyer Sound M Series, which is a fully integrated line of loudspeakers that brings singular advantages to real-world applications. The M3D Line Array, shown in Figure 1, draws upon classic linear array principles and is a hybrid system using advanced engineering to optimize line array performance for consistent, reliable coverage.
Information and specifications are applicable as of the date of printing. Updates and supplementary information are posted on the Meyer Sound web site at: http://www.meyersound.com or you may contact Meyer Sound Technical Support at: Tel: 510.486.1166 fax: 510.486.8356 email: techsupport@meyersound.
CAUTION: If the Active LED does not ! illuminate or the system does not respond to audio input after ten seconds, remove AC power immediately. Verify that the voltage is within the proper range. If the problem persists please contact Meyer Sound or an authorized service center. If the voltage decreases below the lower boundary of either operating range (brownout), the supply uses stored energy to continue functioning briefly.
neutral (blue) line (brown) ground (green/yellow) WARNINGS: THIS PRODUCT MUST BE GROUNDED GROUND (GREEN/YELLOW) This surface may reach high tempuratures white in use. To ensure proper operation, allow at least 6 inches clearance from this surface and adequate ventilation. To reduce the risk of electric shock do not remove cover. No operator or serviceable parts inside. Refer servicing to qualified personnel. To reduce the risk of fire or electric shock do not expose this appliance to rain or moisture.
SAFETY ISSUES TIP: Use the rings located in the rear above the amplifier on the M3D or M3D-Sub to provide strain relief for the power and signal cables. Pay close attention to these important electrical and safety issues. ! CAUTION: Do not use a power cord adapter to drive the M3D or M3D-Sub from a standard three-prong Edison outlet since that connector is rated for only 15 amps (NEMA 5-15R; 125 VAC max.
The HP-4 amplifier utilizes complementary-power MOSFET output stages (class AB/H). All the specific functions for the M3D and M3D-Sub such as crossovers, frequency, phase response, and driver protection are determined by the control card installed inside the HP-4 amplifier. audio input loop out All Meyer Sound loudspeakers are shipped with the drivers in correct alignment. However, if a driver needs to be replaced, make sure the replacement is reinstalled with the correct polarity.
M3D-Sub Interconnections Each front 4 ohm, 18-inch, low-frequency driver is powered by one channel of the HP-4/M3D-Sub amplifier; also, each rear 8 ohm, 15-inch low-frequency driver is powered by one amplifier channel. Figure 13 shows how the drivers are connected to the amplifier in the M3D-Sub. Left Front MS-418 N Right Front MS-418 N + + Right Rear MS-815 ■ Increasing the input level will not increase the volume. ■ The system distorts due to clipping and nonlinear driver operation.
NOTE: The TPL LEDs indicate when the safe power level is exceeded. If an entire system of M3Ds begins to limit before reaching the required sound pressure level (SPL), you should consider adding more loudspeakers. fixed level for that frequency, protecting the drivers and minimizing negative sonic effects. The LED, shown in Figure 15, illuminates when the maximum allowed peak voltage at each frequency is reached.
Two variable-speed primary fans run continuously with an inaudible operating noise of 22 dBA at 1 m at their slowest speed. The primary fans begin increasing speed when either of the two heatsinks reaches 42˚C. The fans reach full speed at 62˚C and are barely audible near the cabinet, even without an audio signal. In the event that the heatsink temperature reaches 74˚C, the secondary fans turn on and are clearly audible without an audio signal.
Removing the M3D/M3D-Sub Amplifier If you need to remove the M3D amplifier, you must first remove the rain hood, as follows: 1. Using a #2 Phillips screwdriver, remove all eight screws from the rain hood. This will free both the rain hood and the HP-4 electronics module from the M3D cabinet. (Refer to Figure 19.) 5. Start all eight screws into the holes before tightening them. 6. Use the screws to sandwich the fabric and its gasket reinforcement bar over the external gasket. 7.
HYBRID LINE ARRAYS The M3D is a high-powered BroadbandQ™ loudspeaker system. In order to effectively array, drive, and optimize a system to produce optimal results, it’s important to understand how a hybrid line array loudspeaker works. For high frequencies, the M3D takes advantage of the control that wave guide horns provide. In the horizontal pattern of the array, these horns work just as any wave guide does to produce a consistent beamwidth of coverage.
Figure 21. Using vertical splay to adjust a line array’s coverage With these two technologies (low-frequency line array and high-frequency wave guide) combined in a single product, it's important to understand how to best electronically drive a hybrid line array. The highfrequency section can, and usually should, be zoned for implementing different equalization into zones. The first step is to optimize the coverage using the relative mechanical splay between the array's elements.
Figure 22.
CABLING One method of cabling the system is using the Meyer Sound/VEAM cable system. This system incorporates power, signal, and RMS monitoring system all in one heavy-duty cable and connector per M3D cabinet. The electrical, signal, and RMS cables for each cabinet can be consolidated to create a “three-pair” multiconductor cable. This can be accomplished by using separate electrical and signal XLR cable.
Figure 24. M3D Line Array and M3D-Sub with looped connections When the two are driven with the same signal but the M3D-Sub is attenuated by 6 dB, the response is identical to the M3D Line Array alone but extends to 30 Hz, as shown in Figure 25. Figure 25. M3D Line Array and M3D-Sub with M3D-Sub attenuated by 6 dB The third option provides optimal headroom to the M3Ds, while adding an often preferred frequency response bump centered around 65 Hz.
LD-1A ALL POLARITY SETTINGS FOR LD-1A & LOUDSPEAKERS REMAIN THE SAME M3D DS-2 & Sub Crossover (IN) DS-2 OUTPUT MID-HI OUTPUT (LOW CUT OUT, ARRAY EQ OUT) M3D-Sub Figure 26. M3D and M3D-Sub headroom optimization using an LD-1A line driver Figure 27 shows an LD-2 line driver configured to produce the same results as the LD-1A line driver shown in Figure 26. The comparison plot when using these configurations is shown Figure 28.
Figure 28. M3D driven from the mid-bass output of LD-1 line driver with the M3D-Sub driven with a full-range signal SIM® SYSTEM II Applications SIM System II is a powerful, compact instrumentation product line comprising the SIM-2201 Sound Analyzer, SIM-2403 Interface Network, and a selection of software options, microphones and accessory cables.
MEYER SOUND MAPP ONLINE™ MAPP (Multipurpose Acoustical Prediction Program) Online is a powerful, cross-platform, Java-based application for accurately predicting the coverage pattern, frequency response, impulse response, and maximum SPL output of arrayed Meyer Sound loudspeakers.
Figure 29.
APPENDIX A - M3D LINE ARRAY SPECIFICATIONS Table 2. M3D Line Array Specifications Acoustical Note: The low-frequency power response of the system will increase according to the length and configuration of the array Operating frequency range 35 Hz to 16 kHz Free field ±4 dB 42 Hz - 16 kHz; -6 dB @ 35 Hz and 16 kHz Note: Measured with 1/3 octave frequency resolution in fixed ISO bands at 4 meters.
Table 2.
Table 2. M3D Line Array Specifications (continued) Burst current (<1 sec) 32 A RMS (115 V) 16 A RMS (230 V) 36A RMS (100 V) Note: AC power cabling must be of sufficient gauge so that under burst current conditions, cable transmission losses do not drop voltage below specified operating range at the speaker.
APPENDIX B - M3D-SUB DIRECTIONAL SUBWOOFER SPECIFICATIONS Table 3.
Table 3.
Table 3. M3D-Sub Directional Subwoofer (continued) Figure 31.
CONTACT INFORMATION Meyer Sound Laboratories, Inc. 2832 San Pablo Avenue Berkeley, CA 94702 tel: 510.486.1166 fax: 510.486.8356 e-mail: techsupport@meyersound.com http: www.meyersound.com Part Number: 05.105.022.01 Rev.
