Meyer Sound Car Speaker MSL 4 User Manual

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.  
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Contents  
Safety Summary ................................................................... Rigging ................................................................................. 8  
2
Measurement and System Integration Tools ......... 8  
Complete Systems ...................................................... 9  
Driver Troubleshooting ........................................... 12  
Array Design ............................................................. 13  
Specifications ............................................................14  
Controls and Connectors ........................................ 15  
Introduction...................................................................4  
AC Power .....................................................................4  
Audio Input ..................................................................6  
Amplification and Protection Circuitry.........................6  
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  
Masse, châssis  
Protective earth ground  
Terre de protection  
Pour indiquer les risques résultant de  
tensions dangereuses  
Pour indequer important instruc-  
tions  
Zu wichtige betriebs-  
anweisung und unter-  
haltsanweisung zeigen  
Zu die gefahren von gefährliche  
spanning zeigen  
Rahmen oder chassis  
Armadura o chassis  
Die schutzerde  
Para indicar importante  
funcionar y mantenimiento instruc-  
ciones  
Para indicar azares provengo de  
peligroso voltajes  
Tierra proteccionista  
Declaration of Conformity According to ISO/IEC Guide and EN 45014  
Declares that the product:  
The Manufacturer:  
MSL-4  
Product Optons: All  
Meyer Sound Laboratories, Inc.  
2832 San Pablo Avenue  
Berkeley, California 94702-2204, USA  
Conforms to the following Product Specifications:  
Operating temperature:  
Nonoperating temperature:  
+75o C  
0oCto + 45oC  
< -40o C or >  
Safety:  
EMC:  
EN 60065: 1994  
EN 55022: 1987 - Class A  
IEC 801-2: 1984 - 8 kV  
IEC 801-3: 1984 - 3 V/m  
IEC 801-4: 1984 - 0.5 kV Signal  
Humidity:  
to 95% at 35o C  
Operating Altitude:  
Nonoperating altitude:  
Shock:  
to 4600 m (15,000 ft)  
to 6300 m (25,000 ft)  
30g 11 msec half-sine  
on each of 6 sides  
The product herewith complies with the requirements  
of the Low Voltage Directive 73 / 23 / EEC and  
the EMC Directive 89 / 336 / EEC.  
Vibration:  
10 Hz to 55 Hz (0.010m  
Office of Quality Manager  
Berkeley, California USA  
April 27, 1999  
3
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Introduction  
at 50 or 60Hz. Immediately after applyingAC power, the green  
ActiveLEDontheuserpanelilluminatesandtheproperoperat-  
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.  
TheMSL-4self-poweredloudspeakersystemisidealforlarge  
venues requiring long throw distances and precise coverage,  
but can alsobeusedeffectivelyinsmallerapplications. 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.  
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  
amplifiersystemwithTheMeyerSoundSelf-PoweredSeriesMP-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.  
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  
(2throat, 4diaphragm)inacompacttrapezoidalcabinet.This  
integrateddesignprovidesexcellentperformance, durability,  
and reliability, eliminates amplifier racks, and simplifies  
setup and installation.  
TheMSL-4matcheswellwiththeMeyerSoundDS-4self-pow-  
eredmid/bassloudspeaker, thePSW-2and650-Pself-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:  
If the voltage decreases below the lower bound of either op-  
erating range (known as a brown-out period), the supply uses  
currentfromitsstoragecircuitsandcontinuesto 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.  
Frequency Response  
Phase Response  
Coverage  
±4 dB 65 Hz – 18 kHz  
±30° 450 Hz – 10 kHz  
40° H x 35° V  
Ifthevoltageuctuateswithin 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.  
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  
forallspeakersinthenetworkonaWindows-basedPC. Contact  
Meyer Sound for more information about RMS.  
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-4doesnotturnbackonaftertenseconds,removeACpower  
and refer to the TROUBLESHOOTING NOTE above.  
AC Power  
WhenAC power is appliedto theMSL-4, theIntelligentAC™  
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.  
Current Requirements  
The MSL-4 presents a dynamic load to the AC mains which  
causes the amount of current to fluctuate between quiet and  
loudoperatinglevels. Sincedifferenttypesofcablesandcircuit  
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  
NOTE: Continuous voltages higher than 275V may damage  
the unit!  
Voltage Requirements  
The MSL-4 operates safely and without audio discontinuity if  
theAC voltage stays within the ranges 85–134V or 165–264V,  
4
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grounding adapter when connecting to ungrounded out-  
lets.  
used to select the rating for slow-reacting thermal breakers.  
The maximum burst RMS current is the maximum RMS cur-  
rent 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 longAC cables according  
to the formula  
Do not use a ground-lifting adapter or cut the AC cable  
ground pin.  
Vpkdrop = Ipk x Rtotal cable  
Keep all liquids away from the MSL-4 to avoid hazards  
from electrical shock.  
Usethetablebelowasaguidetoselectcablesandcircuitbreak-  
ers with appropriate ratings for your operating voltage.  
Do not operate the unit if the power cables are frayed  
MSL-4CurrentRatings  
115V 230V 100V  
or broken.  
Tie-wrap anchors on the amplifier chassis provide strain  
relief for the power and signal cables. Insert the plastic  
tie-wraps through the anchors and wrap them around  
the cables.  
Max.ContinuousRMS  
Max.BurstRMS  
8A  
15A  
22A  
4A  
8A  
10A  
18A  
25A  
Max.PeakDuringBurst  
11A  
Theminimumelectricalserviceamperagerequiredbyasystem  
of Meyer speakers is the sum of their maximum continuous  
RMS currents. We recommend allowing an additional 30%  
above the minimum amperage to prevent peak voltage drops  
at the service entry.  
TROUBLESHOOTINGNOTE:Intheunlikelycasethatthecir-  
cuit breakers trip (the white center buttons pop out), do not reset  
the breakers! Contact Meyer Sound for repair information.  
Safety Issues  
Pay close attention to these important electrical and safety  
issues.  
Use a power cord adapter to drive the MSL-4 from a  
standard 3-prong outlet (NEMA 5-15R; 125 V max).  
earth  
ground  
chassis  
ground  
The MSL-4 requires a grounded outlet. Always use a  
5
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presented by the paralleled input circuit. For most source  
equipment it is safe to drive circuits whose input impedance  
is no smaller than 10 times its output impedance. For example,  
cascading 10 MSL-4s produces an input impedance of 1000  
Ohms (10kΩ divided by 10). The source equipment should  
have an output impedance of 100 ohms or less.  
Power Connector Wiring  
Use the following AC cable wiring diagram to create interna-  
tional or special-purpose power connectors:  
brown = hot  
blue =  
neutral  
This is also true when connecting in parallel (loop out) MSL-  
4s to 650-Ps, DS-4Ps, or any other Meyer Sound self-powered  
loudspeaker system.  
yellow/green =  
earth ground  
(chassis)  
The LD-1A is highly recommended when driving systems  
using multiple speakers. (See Measurement and Integration  
Tools, page 9.)  
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:  
Amplification and Protection Cir-  
cuitry  
Each driver in the MSL-4 is powered by one channel of the  
Meyer SoundMP-2, a 1240WRMS amplifier (620WRMS/ch)  
utilizing complementary power MOSFET output stages (class  
AB/H). The following sections discuss the MP-2’s limiting  
circuitry and the two-fan cooling system.  
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.  
Connectthegreenandyellowwiretotheterminalmarked  
with an E (or ) or colored green (or green and yel-  
low).  
TruPower™ Limiting System  
Audio Input  
Conventionallimitersassumethattheresistanceofaloudspeaker  
remains constant and set the limiting threshold by measuring  
voltageonly.Thismethodisinaccuratebecausetheloudspeaker’s  
resistance changes in response to the frequency content of the  
source material and thermal variations in the loudspeaker’s  
voice coil and magnet. Conventional limiters begin limiting  
prematurely,whichunder-utilizessystemheadroomanddeprives  
the loudspeaker of its full dynamic range.  
TheMSL-4presentsa10kΩbalancedinputimpedancetoathree-  
pin XLR connector wired with the following convention:  
Pin 1 — 220 kΩ to chassis and earth ground (ESD clamped)  
Pin 2 — Signal  
Differential Inputs  
Pin 3 — Signal  
Case — Earth (AC) ground and chassis  
Shortinganinputconnectorpintothecasecanformaground  
loop and cause hum.  
The TruPower limiting (TPL) system accounts for varying  
loudpeaker impedance by measuring current, in addition  
to voltage, to compute the power dissipation and voice coil  
temperature. TPL improves performance during limiting by al-  
lowing the loudspeaker to produce its maximum SPLacross its  
entire frequency range and extends the lifetime of the drivers  
by controlling the temperature of the voice coil.  
Pins 2 and 3 carry the input as a differential signal; their polar-  
ity can be reversed with the input polarity switch on the user  
panel. If the switch is in the up position, pin 2 is hot relative  
to pin 3, resulting in a positive pressure wave when a positive  
signal is applied to pin 2. Use standard audio cables with XLR  
connectors for balanced signal sources.  
HI Limit and LO Limit LEDs on the user panel indicate TPL  
activityforthehighandlowfrequencyamplifierchannels.When  
eitherchannelexceedsthesafecontinuouspowerlevel, its limiter  
engages, ceasingoperationwhenthepowerlevelreturnstonormal.  
The limiters for each channel function independently and do  
not affect the signal when the LEDs are inactive.  
TROUBLESHOOTING NOTE: If abnormal noise (hum,  
hiss, popping) is produced from the loudspeaker, disconnect  
the audio source from the speaker. If the noise stops, then the  
problem is not within the loudspeaker; check the audio input  
and AC power.  
The MSL-4 performs within its acoustical specifications and  
operates at a normal temperature if the limit LEDs are on for no  
A single source can drive multiple MSL-4s with a paralleled  
input loop, creating an unbuffered hardwired loop connection.  
The input impedance fo a single MSL-4 is 10kΩ; cascading  
n MSL-4s will produce a balanced input impedance of 10kΩ  
divided by n. To avoid distortion from the source, make sure  
that the source equipment can drive the total load impedance  
6
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longerthantwoseconds, andoffforatleastonesecond. Ifeither  
LED remains on for longer than three seconds, that channel is  
hard limiting with these negative consequences:  
power supply  
Increasing the input level will not increase the vol-  
ume.  
The system distorts due to clipping and nonlinear driver  
operation.  
amplifier  
heatsinks  
Unequal limiting between the low and high frequency  
drivers alters the frequency response.  
air  
intake  
cooling  
fans  
Driver and amplifier life-span is reduced because they  
are subjected to excessive heat.  
air filter  
NOTE: Although the TPL limiters exhibit smooth sonic char-  
acteristics, we do not recommend using them for intentional  
compression effects. Use an outboard compressor/limiter to  
compress a mixed signal.  
Avariable-speedprimaryfanrunscontinuouslywithaninaudible  
operating noise of 22dBAat 1 m at its slowest speed. The speed  
of the primary fan begins increasing when the temperature  
of the heatsinks reaches 42°C. The fan reaches full speed at  
62°C and is barely audible near the cabinet, even without an  
audio signal.  
The TPL LEDS can indicate an imbalance in a configuration of  
loudspeakers by functioning like a spectrum analyzer. If the  
loudspeakers in a subwoofer, mid-bass, or mid-hi subsystem  
begin to limit before reaching the required operatinglevelfor  
theentiresystem, thenthatsubsystemneeds to be supplemented  
with additional loudspeakers.  
Intheunusualeventthattheheatsinktemperaturereaches74°C,  
the secondary fan turns on; it turns off when the temperature  
decreases to 68°C. The secondary fan is audible at close prox-  
imity without an audio signal and turns on in response to  
primary fan failure (check its status immediately);  
Fans and Cooling System  
a prolonged period of high source levels in hot tempera-  
tures or direct sunlight;  
The MSL-4 uses a forced-air cooling system with two fans to  
prevent the amplifiers from overheating. The fans draw air in  
through ducts on the front of the cabinet, over the heatsinks, and  
out the rear of the cabinet. Since dust does not accumulate in  
the amplifier circuitry, its life-span is increased significantly.  
accumulation of dust in the cooling system path;  
driver failure.  
TROUBLESHOOTING NOTE: In the highly unlikely event  
that the secondary fan does not keep the temperature below  
85°C, the MSL-4 automatically shuts down until AC power is  
removed and reapplied. If the MSL-4 shuts down again after  
cooling and reapplying AC power, contact Meyer Sound for  
repair information.  
A foam insert filter, in combination with the entire front grill  
surface, acts as an air filter for the cooling system. Despite the  
filtering, extensiveuseoradustyoperatingenvironmentcanal-  
lowdusttoaccumulatealongthepath of the airflow, preventing  
normal cooling. We recommend periodically removing the  
grill, filter, and amplifier module and using compressed air to  
clear dust from the grill, filter, fans, and heatsinks. Make sure  
that the air ducts are clear and that there is at least six inches  
clearance for exhaust behind the cabinet.  
7
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There are four types of interchangeable rigging brackets, each  
fastened by six Phillips screws:  
Rigging  
Two types of rigging hardware are available to fly the MSL-  
4 loudspeaker system: Aircraft pan fittings and the optional  
L-Track system. Both are installed and tested exclusively at  
aircraft pan fittings (ring and stud)  
3/8”-16 nut plates  
Meyer Sound Laboratories.  
M-10 x 1.5 metric nut plates  
blank plates (if no rigging brackets are requested)  
Aircraft Pan Fittings Only  
NOTE: Units with nut plates are rated for the weight of one  
cabinet 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 has six rigging brackets (three on  
top and bottom of the cabinet); each bracket is capable of sup-  
porting the full working load of the cabinet.  
Rigging load ratings assume a straight tensile pull and that the  
cabinet is in new condition with aircraft pan fittings. If these  
conditions are not met, the load ratings can be reduced sig-  
nificantly. Load ratings can also be reduced by age, wear, and  
damage. Itisimportanttoinspecttherigginghardwareregularly  
and replace worn or damaged components immediately.  
rigging brackets  
three on top, three on bottom  
Thecabinet,exposedelectroniccircuitry, and drivers can receive  
protective treatment that permits safe use in wet conditions.  
Additionally, a rain hood can be fitted to shield cables and  
electronics. Do not install a unit outdoors without weather  
protection! Contact Meyer Sound for more information.  
Handles are for carrying only.  
Do not use them for rigging!  
!
The MSL-4 with Optional L-Track Rigging Sys-  
tem  
8
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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.  
NOTE: When flying the MSL-4 using the L-Track system,  
it is absolutely imperative that you do not exceed either  
the maximum recommended working load for an entire  
!
cabinet or the working load of any individual rigging point.  
All working load limit ratings assume the cabinet, fittings,  
and L-Track are in new condition. If not, the load ratings can  
be reduced significantly. It is important to inspect the rigging  
hardware regularly and replace worn or damaged components  
immediately.  
L-Track provides eight rigging points (four on the top and  
bottom end of each cabinet); the maximum working load of  
each individual point is dependent on the direction in which  
the cabinet is being pulled at each particular point. Figure 1 on  
the following page shows the working loads for each point as  
they vary depending on cabinet pull angle.  
2
1200  
1000  
A
B
800  
C
E
600  
D
400  
200  
0
0 10 20 30 40 50 60 70 80 90  
o
o
90o  
E
0o  
A
o
90  
C
40  
B
20  
D
1Depending upon your geographic location a different safety factor may be required. 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 responsi-  
bility to adhere to local regulations and evaluate the reliability of any rigging method for their application. Rigging  
should be done only by experienced professionals.  
2Results from tests of the L-Track rigging system using the New Haven Part # NH47556-12.  
9
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Measurement and System  
Integration Tools  
It is essential that even the most carefully assembled sound  
systems be analyzed with precise measurement tools. We rec-  
ommend using the Meyer SIM® System II Sound Analyzer  
and CP-10 Parametric Equalizer to  
Complete Systems  
MeyerSoundloudspeakersystemsaredesignedtocomplement  
one another, with the goal of ensuring full harmonic depth and  
richness to the audial experience.  
ThefollowingMeyerSoundloudspeakersystemsarementioned  
intheexampleapplications. Notethateachapplicationrequires  
the use of the LD-1A line driver.  
assist the process of configuring speaker systems;  
CQ: Self-powered loudspeaker  
measure propagation delays between subsystems to set  
the correct polarity and delay times;  
DS-2P, DS-4P: Self-powered mid-bass loudspeakers  
650-P: Self-powered subwoofer  
measure and equalize variations in frequency response  
caused by the acoustical environment and the placement  
and interaction of speakers.  
PSW-2, PSW-4: Self-powered subwoofers  
650-R2: Externally amplified subwoofer  
We recommend using the Meyer Sound LD-1A Line Driver  
to integrate different types of Meyer self-powered loudspeakers  
intoacompletesystem.TheLD-1Ahastwochannels equipped  
to control a full-range main system, and six auxiliary chan-  
nels for down-fill, front-fill, and delay systems. The LD-1A  
maintains signal integrity for long cable paths and provides the  
following useful functions:  
The Meyer Sound self-powered loudspeaker systems listed  
abovehavealoopconnectiontosendtheinputsignaltoanother  
loudspeaker. Full-range signals can be applied to all Meyer  
Sound self-powered subwoofers because they have built-in  
active crossovers that filter mid-hi frequencies.  
Thecabinetsinthefollowingexamplesareinaclose-proximity  
coplanarorientation,unlessotherwisestated.Externallyamplified  
Meyer subwoofers require the opposite polarity to all Meyer self-  
powered speakers. Separating speakers by more than 5 ft may  
require polarity reversal to compensate for the propagation  
delay between the loudspeakers and the measurement or lis-  
tening position.  
The Lo Cut switch activates a high-pass filter (160Hz,  
–12 dB/oct, Q = 0.8) that performs a crossover function  
for the Mid-Hi output.  
The DS-2/DS-4 & Sub Crossover switch (channels 1  
and 2 only) activates a crossover network optimized for  
the DS-2P and DS-4P when used with the 650-P. With  
the switch in, frequencies below 80Hz are sent to the  
Sub output (for the 650-P), and above 80Hz to the DS-2  
output. When the 650-P is used without the DS-4P, the  
switch should be out, which sends a full-range signal  
to both the DS-2 and Sub outputs.  
MSL-4 and 650-P  
The MSL-4 is particularly well matched with the 650-P and  
PSW-2 and also performs efficiently with the PSW-4. Due  
to the overlap in frequency response between the MSL-4 and  
the subwoofer, the system frequency response exhibits a low  
frequency (LF) rise in the range 65–120Hz. It is important to  
emphasize that the loudspeakers are in phase in this region.  
The rise can be corrected using the Meyer Sound CP-10  
Parametric Equalizer, if desired.  
TheDS-2/DS-4andSubswitches(channels1and2only)  
toggle the polarity for the DS-2 and Sub outputs.  
The Mid-Hi, DS-2, and Sub outputs (channels 1 and  
2 only) each have their own gain control and mute  
switch.  
POLARITY NOTE: The polarity for Meyer self-powered loud-  
speaker systems may be reversed using the input polarity switch  
on the user panel. The LD-1A also 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 state of all  
polarity switches.  
MSL-4  
input  
loop  
CP-10 EQ  
(1 Channel)  
650-P  
input  
Contact Meyer Sound for assistance with your application.  
Set the MSL-4 and 650-P to the same polarity.  
10  
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LD-1A with Flown MSL-4, DS-2P/DS-4P, and CQ;  
650-P on the Floor  
LD-1A with MSL-4 and 650-P  
A typical MSL-4:650-P ratio is 2:1 but separate Sub and Mid-  
Hi 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.  
This example shows the LD-1Aintegrating a complete system  
of self-powered loudspeakers for a large venue. Although the  
diagram shows half of the system with channels 1, 3, and 5,  
channels 2, 4, and 6 can be used with identical connections for  
the other half. The MSL-4, DS-2P/DS-4P, and CQ arrays are  
flown; the 650-Ps are on the floor.  
MSL-4  
CH 1 Mid-Hi  
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 loudspeakers directed at different distances.  
Thediagramshowstheadditionalmid-hioutputcreatedbycon-  
necting the CH 1 Loop to the CH 3 input. Using a Y-connection  
at the CH 1 input (as shown for the down-fills) accomplishes  
the same signal routing. The Lo Cut and Array EQ switches  
for both channels should be in. The Lo Cut filters eliminate  
the LF rise caused by the frequency response overlap between  
the MSL-4 and DS-2P/DS-4P/650-P systems. The Array EQ  
filters minimize the MSL-4 array’s low-mid rise.  
LD-1A  
Line Driver  
CH1  
Input  
CH 1 Sub  
650-P  
Set the MSL-4 and 650-P to the same polarity.  
LD-1A with Flown PSW-2 and MSL-4;  
650-P on the Floor  
The CH 1 DS-2 and Sub outputs drive the DS-2P/DS-4P and  
650-P loudspeaker systems with the DS-2 & Sub Crossover  
switch in. Set the MSL-4 and DS-2P/DS-4P to the same  
polarity. The polarity of the 650-P depends on the height and  
distance of the measurement position from the subwoofer and  
flown systems.  
Including subwoofers in a flown cluster provides a smooth  
frequency image because the low and mid-hi frequencies are  
produced fromloudspeakerslocatedclosetogether.Theidentical  
dimensions of the PSW-2 and MSL-4 allow them to be easily  
flown together.  
CH 5 controls the CQ down-fill system. Since the main system  
is more powerful than the down-fill system to project farther  
into the venue, the main system is audible in the down-fill’s  
coveragearea.Toinsurethattheloudspeakerscombineproperly  
in the intersecting coverage area:  
The CH 1 Mid-Hi output drives the MSL-4 with the Lo Cut  
filter in. The CH 1 Sub and DS-2 outputs drive the 650-Ps and  
PSW-2s with the DS-2 & Sub Crossover switch out, which  
sends a full-range signal with independent level control to  
each loudspeaker.  
Set the CQ to the opposite polarity to the MSL-4 to phase  
align the mid-hi frequencies and minimize the MSL-4’s  
LF down-lobe.  
MSL-4 and  
PSW-2  
flown in  
Use the CH 5 Lo Cut filter to eliminate the LF rise  
caused by the overlap in frequency response with the  
650-P and DS-2P/DS-4P systems.  
same cluster  
CH 1 Mid-Hi  
LD-1A  
Line Driver  
CH 1 Input  
CH 1 DS-2  
Delay the down-fill to compensate for the propagation  
delay between the down-fill and main systems in the  
intersecting coverage area.  
CH 1 Sub  
650-P  
subwoofer  
on the floor  
We recommend that the entire system be measured, phase-  
aligned, andequalizedusingtheSIMSystemIISoundAnalyzer  
and CP-10 Parametric Equalizer.  
Set the MSL-4 and PSW-2 to the same polarity. The polarity for  
the 650-P depends on the height and distance of the measure-  
ment position from the flown and subwoofer systems.  
11  
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MSL-4 Mid-Hi  
Driver Troubleshooting  
LD-1A  
CH 1  
Input Mid-Hi  
Output  
Troubleshooting with TPL  
CP-10 EQ  
TheTPLLEDcanindicateseriousdriverproblems,ifinterpreted  
correctly. If one MSL-4 in a system exhibits substantially more  
TPL activity than others receiving the same audio signal, then  
one or both drivers in that unit may have a short circuit. This  
is a potentially dangerous condition for the electronics; shut  
the MSL-4 down immediately.  
Loop  
DS-2  
Output  
DS-2P/DS-4P Mid-Bass  
Sub  
Output  
Delay  
Input Output  
CH 3  
CP-10 EQ  
Input Output  
TheTPLcircuitdoesnotactivateifthereisnopowerdissipation  
in the driver, regardless of the input signal level. Therefore,  
if all MSL-4s in a system receiving the same audio signal  
exhibit TPL activity except one, then that unit may have an  
open voice coil; disconnect it and contact Meyer Sound for  
repair information.  
CH 5  
CQ Down-fills  
NOTE:TheRemoteMonitoring System(RMS)providesprecise  
information about peak power, peak voltage, and average volt-  
age (VU) for each amplifier channel, enabling a more complete  
driver diagnostic than the TPLLEDs. Contact Meyer Sound for  
more information about RMS.  
650-P Subwoofers  
Set the MSL-4 and DS-4P to the same polarity; reverse the  
polarity for the CQ. The polarity for the 650-P depends on  
the height and distance of the measurement position from the  
flown and subwoofer systems.  
Driver Replacement  
Todeterminewhetheraloworhighfrequencydriverisfunctioning  
properly, or replace a damaged driver, contact Meyer Sound to  
obtain the Low Driver Inspection and Evaluation Procedure  
for Self-Powered Series Products (part # 17.010.120.01) or the  
HighDriverInspectionandEvaluationProcedureforSelf-Powered  
Series Products (part # 17.010.120.02).  
MSL-4 and 650-R2  
Although it is preferable to use the MSL-4 in a completely self-  
powered system, excellent results can still be achieved using the  
650-R2, USW-1, and MSW-2.  
Verifying Driver Polarity  
Incorrect driver polarity impairs system performance and may  
damage the drivers. All Meyer loudspeakers are shipped with  
thedriversincorrectalignment. However, ifthedriverorcircuit  
wiring has been removed or disassembled in any loudspeaker  
in a system for any reason, it is essential to check the polarity  
between drivers in the same cabinet and between adjacent  
loudspeakers.  
MSL-4  
CP-10 EQ  
(1 Channel)  
650-R2  
B-2EX  
Amplifier  
subwoofer  
CEU  
We do not recommend using phase poppers to analyze driver  
polarity. The phase response for all drivers varies, to some  
degree, over the frequency range in which it operates. Since  
the phase popper, a popular but inaccurate tool, does not dis-  
cern variations in phase response with respect to frequency,  
it provides no useful information about the phase response  
through the crossover, the most important consideration for  
determining correct driver polarity.  
Set the MSL-4 to the opposite polarity to the 650-R2 ampli-  
fier.  
12  
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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,  
applyaphasepopperonlytoloudspeakerswithidenticaldrivers  
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.  
Driver Polarity in the Same Loudspeaker  
Use the following test procedure to verify polarity between  
drivers in the same loudspeaker:  
1. Place a measurement microphone 3 ft from the front of  
the loudspeaker at the midway point between the low  
and high frequency drivers.  
2. Connect a signal source to the loudspeaker and note the  
frequency response.  
High driver is 180° out of phase  
Drivers with correct  
polarity cause acoustic  
addition  
Drivers with reversed  
polarity cause acoustic  
cancellation  
The polarity is correct if the frequency response is smooth  
through the crossover region (600Hz – 1 Hz). Cancellation greater  
than 6 dB in the same range indicates polarity reversal.  
Driver Polarity In Adjacent Loudspeakers  
Use the following test procedure to verify the polarity between  
two adjacent loudspeakers of the same type:  
1. Position two loudspeakers adjacent to each other.  
2. Place a measurement microphone 3 ft from the speakers  
on the axis between them.  
3. Connect a signal source to one speaker and note the  
frequency response and overall level.  
4. Apply the same signal to the second speaker with the  
first speaker still connected.  
Thepolarityiscorrectifthefrequencyresponseremainsconstant  
withasignificantincreaseinamplitude.Broadbandcancellation  
(decreased overall level) indicates polarity reversal.  
13  
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for arrays with one and two horizontal rows of up to six speak-  
ers each, at numerous splay angles. The measurements were  
conducted at a distance of 8 m with half-space loading; on-axis  
SPL values were interpolated from 8 m to 1 m. The coverage  
angle for the array is the result of averaging the –6 dB points  
from 125Hz to 8kHz.  
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.  
The horizontal angles in the tables on the next page represent  
the optimal narrow (15°), middle (22.5°), and wide (30°) orien-  
tations for the MSL-4. The 10° and 20° vertical splay angles  
represent the optimal narrow and wide vertical configurations.  
2@0°LTdenoteslongthrow:thetwohornsarecoupleddirectly  
together (top speaker upside down/bottom speaker upright) to  
form a single narrow horn.  
As the splay angle (the angle between adjacent cabinet faces)  
decreases below the coverage angle of the individual speaker,  
theon-axispowerincreases, butthecoverageoverlapbetween  
adjacent speakers causes comb filtering and other frequency  
response variations.  
As the splay angle increases toward the coverage angle, the  
on-axis power decreases, but the variations in frequency  
response diminish. As the splay angle increases beyond the  
coverage angle, noticeable gaps begin to form in the array’s  
coverage area.  
The following tables show the SPL and coverage areas that  
result from grouping the MSL-4 in arrays of up to six units  
horizontally and two rows vertically. If this information does  
notaddressyourapplicationrequirements,contactMeyerSound  
to obtain additional information on array design.  
NOTE: The trapezoidal shape of the MSL-4 determines only  
the narrowest recommended splay angle (15°) for horizontal  
arrays and does not represent the horizontal coverage area.  
A series of outdoor tests was conducted at Meyer Sound  
Laboratories to determine coverage angles and on-axis SPL  
MSL-4 Array Coverage and Maximum SPL Chart  
Horizontal Units &  
Angle  
1
2 @ 15 °  
2 @ 22.5°  
2 @ 30°  
3 @ 15°  
3 @ 22.5°  
3 @ 30 °  
4 @ 15°  
Max  
Max  
Max  
Max  
Max  
Max  
Max  
Max  
Coverage  
Coverage  
Coverage  
Coverage  
Coverage  
Coverage  
Coverage  
Coverage  
SPL  
SPL  
SPL  
SPL  
SPL  
SPL  
SPL  
SPL  
H
V
(dB Pk)  
H
V
(dB Pk)  
H
V
(dB Pk)  
H
V
(dB Pk)  
H
V
(dB Pk)  
H
V
(dB Pk)  
H
V
(dB Pk)  
H
V
(dB Pk)  
Vertical Rows & Angle  
1
40° 35°  
40° 20°  
40° 40°  
40° 55°  
140  
146  
145  
144  
20° 35°  
20° 20°  
20° 40°  
20° 55°  
145  
151  
150  
149  
50° 35°  
50° 20°  
50° 40°  
50° 55°  
143  
149  
148  
147  
70° 35°  
70° 20°  
70° 40°  
70° 55°  
141  
147  
146  
145  
55° 35°  
55° 20°  
55° 40°  
55° 55°  
147  
153  
152  
151  
80° 35°  
80° 20°  
80° 40°  
80° 55°  
146  
152  
151  
150  
100° 35°  
100° 20°  
100° 40°  
100° 55°  
146  
152  
151  
150  
70° 35°  
70° 20°  
70° 40°  
70° 55°  
149  
155  
154  
153  
2 LT (0°)  
2 @ 10°  
2 @ 20°  
Horizontal Units &  
Angle  
4 @ 22.5°  
4 @ 30°  
5 @ 15°  
5 @ 22.5°  
5 @ 30°  
6 @ 15°  
6 @ 22.5°  
6 @ 30°  
Max  
Max  
Max  
Max  
Max  
Max  
Max  
Max  
Coverage  
Coverage  
Coverage  
Coverage  
Coverage  
Coverage  
Coverage  
Coverage  
SPL  
SPL  
SPL  
SPL  
SPL  
SPL  
SPL  
SPL  
H
V
(dB Pk)  
H
V
(dB Pk)  
H
V
(dB Pk)  
H
V
(dB Pk)  
H
V
(dB Pk)  
H
V
(dB Pk)  
H
V
(dB Pk)  
H
V
(dB Pk)  
Vertical Rows & Angle  
1
100° 35°  
100° 20°  
100° 40°  
100° 55°  
148  
154  
153  
152  
130° 35°  
130° 20°  
130° 40°  
130° 55°  
147  
153  
152  
151  
95° 35°  
95° 20°  
95° 40°  
95° 55°  
150  
156  
155  
154  
120° 35°  
120° 20°  
120° 40°  
120° 55°  
147  
153  
152  
151  
160° 35°  
160° 20°  
160° 40°  
160° 55°  
146  
152  
151  
150  
100° 35°  
100° 20°  
100° 40°  
100° 55°  
150  
156  
155  
154  
145° 35°  
145° 20°  
145° 40°  
145° 55°  
148  
154  
153  
152  
185° 35°  
185° 20°  
185° 40°  
185° 55°  
147  
153  
152  
151  
2 LT (0°)  
2 @ 10°  
2 @ 20°  
14  
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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  
12” diameter MS-12 cone (3” voice coil)  
2” throat, 4” diaphragm MS-2001A compression driver  
800Hz  
High Frequency  
Acoustic Crossover Point  
Audio Input  
Type  
Burst Capability3  
Complementary power MOSFET output stages class AB/H  
1240 Watts (620 Watts/channel)  
< .02 %  
THD, IM, TIM  
AC Power  
Type  
10 kΩ impedance, electronically balanced  
XLR (A-3) male and female  
+4 dBu (1.23 Vrms)  
Connector  
Nominal Input Level  
Amplifiers  
Connector  
250V NEMA L6-20P / IEC 309 Twistlock male receptacle  
85 – 134 V / 165 – 264 V; 50 Hz / 60 Hz  
Automatic voltage selection4  
Max Continuous RMS Current (> 10 s)  
Max Burst RMS Current (< 1 s)  
Max Peak Current During Burst  
Soft Current Turn-on  
115 V: 8 A  
115 V: 15 A  
230 V: 4 A  
230 V: 8 A  
100 V: 10 A  
100 V: 18 A  
100 V: 25 Apk  
115 V: 22 Apk 230 V: 11 Apk  
Inrush current < 12 A @115 V  
Physical  
Dimensions  
Weight  
21.25” W x 36” H x 30” D  
w/o L-Track: 184 lb (83.5 kg); shipping: 213 lb (96.6 kg)  
with L-Track: 205 lb (93.2 kg); shipping 226 lb(106.3 kg)  
Multi-ply hardwood/black textured  
Enclosure/Finish  
Protective Grill  
Rigging  
Hex perforated steel grill, foam covering  
Six aircraft pan fittings (thrree on top and bottom). Working  
load for each fitting is 600 lb (273kg.) based on a 5:1 safety  
factor with a straight tensile pull.  
Optional L-Track rigging system: Working load for each end  
of the cabinet is 1500 lbs (681.8 kg), based on a 5:1 safety  
factor. Working load for individual points varies; see the chart  
on page 9.  
Notes  
4. The unit is rated at 88  
125VAC and  
1. Subject to half-space loading; measured with  
one-third octave frequency resolution in fixed  
ISO bands.  
182 – 235 VAC, 50/60 Hz, to satisfy EC standards  
for –10% to 6% AC line voltage.  
2. Measured as the ratio between the peak SPL and  
the A-weighted noise floor.  
3. Nominal 8 Ω resistive load, pink noise, 100V  
peak.  
15  
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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 inches  
6
Mains AC inlet  
Tie-wrap ancho  
clearance from this surface and adequate ventilation.  
To reduce the risk of electric shock do not remove cover.  
No operator serviceable parts inside.  
Mains circuit  
breakers  
Refer servicing to qualified personnel.  
To reduce the risk of fire or electric shock  
do not expose this appliance to rain or moisture.  
ATENCIÓN  
:
ACCESO INTERNO SOLO  
MSL-4  
AUTORIZADO  
A
PERSONAL TÉCNICO CALIFICADO  
High Limit (red)  
Low Limit (red)  
ACHTUNG  
:
GEHÄUSE NICHT ÖFFNEN WARTUNG  
UND REPARATUR NUR DURCH ELEKTROFACHKRÄFTE  
HI Limit  
ATTENTION  
INTERNES NE SONT AUTORISEES QU'AU  
PERSONNEL TECHNIQUE QUALIFIÉ  
:
ENTRETIEN ET REPARATIONS  
LO Limit  
Active  
/
Speaker Fault  
UK WARNING: THIS APPARATUS MUST BE EARTHED.  
NO OPERATOR SERVICEABLE PARTS INSIDE.  
Input Polarity  
REFER SERVICING TO QUALIFIED PERSONNEL  
PUSH  
Power LED (green/red)  
Input polarity switch  
2
3
+
+
10K  
Auto-Voltage Select  
Balanced  
95-125V  
50-60Hz  
~
208-235V~  
50-60Hz  
1400W RMS MAX 1400W RMS MAX  
1
ESD  
220K  
Case  
2
2
1
1
3
3
Earth / Chassis  
Signal input and  
loop connectors  
e
y
t
i
t
e
c
Network  
i
k
v
i
v
n
s
r
t
c
A
i
e
Input  
e
Loop  
S
W
R
Remote Monitoring  
System panel  
Meyer Sound, Berkeley, CA. USA  
Remote Monitoring System  
(if RMS is installed)  
Rear User Panel shown with the optional Remote  
Monitoring System (RMS) panel  
!
WARNINGS
THIS PROD
This surface may
To ensure proper
clearance from thi
To reduce the risk oo  
No operator service
Refer servicing to qo  
To reduce the risk o
do not expose this a
r
ATENCIÓN  
AUTORIZADO  
:
ACCR  
PE
A
ACHTUNG  
:
GEHÄH  
-
UND REPARATUR N
ATTENTION  
:
ENT
E
INTERNES NE SONT AU  
PERSONNEL TECHNI
-
UK WARNING  
:
TH
NO OPERATOR SERVIC
REFER SERVICING TO Q
H  
Auto-Voltagc  
10A RMS  
20A Peak  
88-127V  
50-60Hz  
~
700W RMS M
Operational
Turn on 80Vu  
Turn on 160Vu  
2
1
1
3
3
e
y
t
i
t
e
c
Network  
i
k
v
i
v
n
s
r
t
c
i
e
e
S
W
R
A
Input  
Loop  
Remote Monitor System  
Meyer Sound,  
European Rear User Panel with  
IEC 309 connector  
16  
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Dimensions  
(in inches)  
21.97"  
10.63"  
21.25"  
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 Europe  
Meyer Sound Germany GmbH  
Carl Zeiss Strasse 13  
D-56751 Polch, Germany  
Telephone: 49.2654.9600.58  
Meyer Sound Laboratories, Inc.  
2832 San Pablo Avenue  
Berkeley, California 94702  
Telephone: 510 - 486 - 1166  
FAX:  
510 - 486 - 8356  
FAX:  
49.2654.9600.59  
17  
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