Operating Instructions MSL-4 Self-Powered Loudspeaker System Top Front Side Copyright © 1999 Meyer Sound Laboratories, Inc. All rights reserved. Part # 05.031.008.01 Rev C Keep these important operating instructions.
Safety Summary English Français • 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. • Pour réduire le risque d’électrocution, débranchez la prise principale de l’haut-parleur, avant d’installer le câble d’interface allant à l’audio. Ne rebranchez le bloc d’alimentation qu’après avoir effectué toutes les connections.
Contents Safety Summary ................................................................... 2 Introduction ...................................................................4 AC Power .....................................................................4 Audio Input ..................................................................6 Amplification and Protection Circuitry.........................6 Rigging .................................................................................
Introduction The MSL-4 self-powered loudspeaker system is ideal for large venues requiring long throw distances and precise coverage, but can also be used effectively in smaller applications. Its highQ (narrow coverage) horn has a consistent beam width across its entire frequency range, enabling efficient array design that maximizes coverage and SPL for a given array size.
used to select the rating for slow-reacting thermal breakers. The maximum burst RMS current is the maximum RMS current over a one second duration. It is used to select the rating for most magnetic breakers. The maximum instantaneous peak current during burst is used to select the rating for fast-reacting magnetic breakers and to calculate the peak voltage drop in long AC cables according to the formula grounding adapter when connecting to ungrounded outlets.
Power Connector Wiring Use the following AC cable wiring diagram to create international or special-purpose power connectors: brown = hot blue = neutral yellow/green = earth ground (chassis) AC cable color code If the colors referred to in the diagram don't correspond to the terminals in your plug, use the following guidelines: • Connect the blue wire to the terminal marked with an N or colored black. • Connect the brown wire to the terminal marked with an L or colored red.
longer than two seconds, and off for at least one second. If either LED remains on for longer than three seconds, that channel is hard limiting with these negative consequences: • Increasing the input level will not increase the volume. • The system distorts due to clipping and nonlinear driver operation. • Unequal limiting between the low and high frequency drivers alters the frequency response.
Rigging Two types of rigging hardware are available to fly the MSL4 loudspeaker system: Aircraft pan fittings and the optional L-Track system. Both are installed and tested exclusively at Meyer Sound Laboratories. Aircraft Pan Fittings Only The MSL-4 without L-Track weighs 184 lb (83.5 kg). The maximum recommended load for an MSL-4 with aircraft pan fittings is 600 lb (273 kg). This working load is based on a 5: 1 safety factor.
The MSL-4 equipped with the L-Track rigging system weighs 205 lbs (93 kg). The maximum recommended load for an L-Track-equipped MSL-4 at vertical pull using any 2 points is 1500 lbs. (682 kg).We strongly recommed using all four rigging points per end. This working load is based on a 5:1 safety factor1.
Measurement and System Integration Tools It is essential that even the most carefully assembled sound systems be analyzed with precise measurement tools.
LD-1A with MSL-4 and 650-P A typical MSL-4:650-P ratio is 2:1 but separate Sub and MidHi level controls on the LD-1A allow the ratio to vary while maintaining control of the spectral balance of the system. The Lo Cut filter for CH1 Mid-Hi should be in to correct the LF rise between the MSL-4 and 650-P. CH 1 Mid-Hi CH1 Input MSL-4 CH 1 Sub 650-P Set the MSL-4 and 650-P to the same polarity.
Driver Troubleshooting MSL-4 Mid-Hi LD-1A Troubleshooting with TPL CH 1 CP-10 EQ Input Mid-Hi Output Loop DS-2 Output DS-2P/DS-4P Mid-Bass Sub Output Delay Input Output CH 3 CP-10 EQ Input The TPL circuit does not activate if there is no power dissipation in the driver, regardless of the input signal level.
Phase poppers are, therefore, not useful for performing phase measurements on an individual loudspeaker or a full-range sound system containing one or more crossovers. If necessary, apply a phase popper only to loudspeakers with identical drivers without a crossover, and check the system’s overall phase response with a frequency analyzer and/or listening test. ! Since polarity reversal causes excessive driver excursion at high source levels, use moderate levels when conducting these tests.
Array Design Creating an effective array with the MSL-4 requires a precise understanding of how to combine the coverage area and SPL of the individual speaker with those of adjacent speakers. Array design is a trade-off between increasing on-axis power and creating smooth transitions between the coverage areas of adjacent speakers. for arrays with one and two horizontal rows of up to six speakers each, at numerous splay angles.
Specifications Acoustical Frequency Response1 Phase Response1 Maximum Peak SPL1 Dynamic Range2 Coverage ±4dB 65Hz-18kHz:-6dB at 60Hz and 20kHz ±30° 450Hz-10kHz 140dB > 110dB 40° H x 35° V Transducers Low Frequency High Frequency Acoustic Crossover Point 12” diameter MS-12 cone (3” voice coil) 2” throat, 4” diaphragm MS-2001A compression driver 800Hz Audio Input Type Burst Capability3 THD, IM, TIM Complementary power MOSFET output stages class AB/H 1240 Watts (620 Watts/channel) < .
Rear Panel and Optional Module ! WARNINGS: THIS PRODUCT MUST BE GROUNDED This surface may reach high temperatures while 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 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.
Dimensions (in inches) 21.97" 21.25" 10.63" 13.36" 13.16" 30.26" 7.5° Top 30.00" 17.50" 36.00" 16.50" 5.50" Side Front Contact Information Meyer Sound Laboratories, Inc. 2832 San Pablo Avenue Berkeley, California 94702 Telephone: 510 - 486 - 1166 FAX: 510 - 486 - 8356 E-mail: techsupport@meyersound.com http://www.meyersound.com Meyer Sound Europe Meyer Sound Germany GmbH Carl Zeiss Strasse 13 D-56751 Polch, Germany Telephone: 49.2654.9600.58 FAX: 49.2654.9600.59 E-mail: meyersound@t-online.
