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4

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 high-

Q (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. 

The  MSL-4  contains  independent  amplifier  and  control 
electronics for one 12” low frequency cone driver (in a horn-
loaded vented enclosure) and one high frequency horn driver 
(2” throat, 4” diaphragm) in a compact trapezoidal cabinet. This 
integrated design provides excellent performance, durability, 
and  reliability,  eliminates  amplifier  racks,  and  simplifies 
setup and installation.

The MSL-4 matches well with the Meyer Sound DS-4 self-pow-
ered mid/bass loudspeaker, the PSW-2 and 650-P self-powered 
subwoofers, and also performs efficiently with the PSW-4. The 
MSL-4 can be used as a full-range or mid-hi speaker and has 
the following acoustical specifications:

Frequency Response  

±4 dB 65 Hz – 18 kHz

Phase Response 

±30° 450 Hz – 10 kHz 

Coverage 

40° H x 35° V

Dynamic Range  

> 110 dB 

The  MSL-4  can  be  equipped  to  operate  with  the 

Remote 

Monitoring System

 

(RMS) interface network and software 

application. RMS displays signal and power levels, driver and 
cooling fan status, limiter activity, and amplifier temperature 
for all speakers in the network on a Windows-based PC. Contact 
Meyer Sound for more information about RMS.

AC Power

When AC power is applied to the MSL-4, the 

Intelligent AC

™  

supply automatically selects the correct operating voltage, al-
lowing  the  MSL-4  to  be  used  in  the  US,  Europe,  or  Japan 
without manually setting a voltage switch. The Intelligent AC  
power supply also protects the MSL-4 by performing surge 
suppression for high voltage transients (up to 275V), min-
imizing inrush current, and filtering EMI. The MSL-4 uses a 
NEMA L6-20P or IEC 309 male power inlet and satisfies UL, 
CSA, and EC safety standards. 

NOTE: Continuous voltages higher than 275V may damage 
the unit! 

Voltage Requirements

The MSL-4 operates safely and without audio discontinuity if 
the AC voltage stays within the ranges 85–134V or 165–264V, 

at 50 or 60Hz. Immediately after applying AC power, the green 

Active 

LED on the user panel illuminates and the proper operat-

ing voltage is automatically selected, but the system is muted. 
During the next three seconds, the primary fan turns on, the 
main power supply slowly ramps on, and the system is enabled 
to pass audio signals. 

TROUBLESHOOTING  NOTE:  If  the Active  LED  does  not 
illuminate or the system does not respond to audio input after 
ten seconds, remove AC power to avoid possible damage to 
the unit. Experienced electronics technicians with access to a 
test bench can verify proper operation for the power supply and 
amplifier system with The Meyer Sound Self-Powered Series MP-2 
and MP-4 Field Verification Procedure (part # 17.022.066.01; 
contact Meyer Sound to receive this document). All other users 
should  contact  Meyer  Sound  or  an  authorized  Meyer  Sound 
service center.

If the voltage decreases below the lower bound of either op-
erating range (known as a 

brown-out 

period), the supply uses 

current from its storage circuits and continues to function briefly. 
The unit turns off if the voltage does not increase above the 
threshold before the storage circuits are depleted. The length 
of time that the MSL-4 continues to operate during brown-out 
depends on how low the voltage drops and the audio source 
level during this period. 

If the voltage fluctuates 

within 

either operating range, automatic 

tap selection stabilizes the internal operating voltage. This tap 
selection is instantaneous and there are no audible artifacts. If 
the voltage increases above the upper bound of either range, 
the power supply turns off rapidly, preventing damage to the 
unit. 

If the MSL-4 shuts down due to either low or high voltage, the 
power supply automatically turns on after three seconds if the 
voltage has returned to either normal operating range. If the 
MSL-4 does not turn back on after ten seconds, remove AC power 
and refer to the TROUBLESHOOTING NOTE above.

Current Requirements

The MSL-4 presents a dynamic load to the AC mains which 
causes the amount of current to fluctuate between quiet and 
loud operating levels. Since different types of cables and circuit 
breakers heat up (and trip) at varying rates, it is essential to un-
derstand the types of current ratings and how they correspond 
to circuit breaker and cable specifications. 

The 

maximum  continuous  RMS 

current  is  the  maximum 

RMS current over a duration of at least 10 seconds. It is used 
to calculate the temperature increase in cables, which is used to 
select cables that conform to electrical code standards. It is also 

Summary of Contents for MSL-4

Page 1: ...ating Instructions MSL 4 Self Powered Loudspeaker System Copyright 1999 Meyer Sound Laboratories Inc All rights reserved Part 05 031 008 01 Rev C Keep these important operating instructions Top Front...

Page 2: ...Kundenien stpersonal durchgef hrt werden Para reducir el riesgo de descarga el ctrica desconecte de la red el altoparlante antes de instalar el cable de se alizaci n de interfaz de la segnale Vuelva...

Page 3: ...e symbols indicate important safety or operating features in this booklet and on the chassis Dangerous voltages risk of electric shock Symbols Used Declaration of Conformity According to ISO IEC Guide...

Page 4: ...peroperat ing voltage is automatically selected but the system is muted During the next three seconds the primary fan turns on the main power supply slowly ramps on and the system is enabled to pass a...

Page 5: ...cording to the formula Vpkdrop Ipk x Rtotal cable Usethetablebelowasaguidetoselectcablesandcircuitbreak ers with appropriate ratings for your operating voltage s g n i t a R t n e r r u C 4 L S M V 5...

Page 6: ...o smaller than 10 times its output impedance For example cascading 10 MSL 4s produces an input impedance of 1000 Ohms 10k divided by 10 The source equipment should have an output impedance of 100 ohms...

Page 7: ...front grill surface acts as an air lter for the cooling system Despite the ltering extensiveuseoradustyoperatingenvironmentcanal lowdusttoaccumulatealongthepath of the air ow preventing normal coolin...

Page 8: ...four types of interchangeable rigging brackets each fastened by six Phillips screws aircraft pan ttings ring and stud 3 8 16 nut plates M 10 x 1 5 metric nut plates blank plates if no rigging brackets...

Page 9: ...ded working load for an entire cabinet or the working load of any individual rigging point All working load limit ratings assume the cabinet ttings and L Track are in new condition If not the load rat...

Page 10: ...lso allows polarity reversal with the DS 2 f and Sub f switches for loudspeakers connected to the DS 2 and Sub outputs When making polarity decisions in applications that include the LD 1A check the s...

Page 11: ...DS 2P DS 4P and CQ arrays are own the 650 Ps are on the oor The CH 1 Mid Hi and CH 3 outputs drive the inner three and outer two loudspeakers of the MSL 4 array applying appro priate levels for loudsp...

Page 12: ...r Polarity Incorrect driver polarity impairs system performance and may damage the drivers All Meyer loudspeakers are shipped with thedriversincorrectalignment However ifthedriverorcircuit wiring has...

Page 13: ...speaker and note the frequency response Drivers with correct polarity cause acoustic addition Drivers with reversed polarity cause acoustic cancellation High driver is 180 out of phase The polarity is...

Page 14: ...optimal narrow and wide vertical con gurations 2 0 LTdenoteslongthrow thetwohornsarecoupleddirectly together top speaker upside down bottom speaker upright to form a single narrow horn The following t...

Page 15: ...male receptacle 85 134 V 165 264 V 50 Hz 60 Hz 115 V 8 A 230 V 4 A 100 V 10 A 115 V 15 A 230 V 8 A 100 V 18 A 115 V 22 Apk 230 V 11 Apk 100 V 25 Apk Inrush current 12 A 115 V 21 25 W x 36 H x 30 D w o...

Page 16: ...IZADO A PERSONAL T CNICO CALIFICADO ACHTUNG GEH USE NICHT FFNEN WARTUNG UND REPARATUR NUR DURCH ELEKTROFACHKR FTE ATTENTION ENTRETIEN ET REPARATIONS INTERNES NE SONT AUTORISEES QU AU PERSONNEL TECHNIQ...

Page 17: ...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...

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