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.
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
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
(2”throat, 4”diaphragm)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
Ifthevoltagefluctuateswithin 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
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
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
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
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
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
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
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
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
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
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
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
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
Ω
Auto-Voltage Select
Balanced
95-125V
50-60Hz
~
208-235V~
50-60Hz
1400W RMS MAX 1400W RMS MAX
1
ESD
220K
Case
Ω
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
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
E-mail: [email protected]
E-mail: [email protected]
17
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