Meyer Sound Speaker MTS 4A User Manual

MTS-4A  
Self-Powered Loudspeaker Systems  
OPERATING INSTRUCTIONS  
Superior  
engineering  
for the art  
and science  
of sound.  
Keep these important operating instructions  
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!
SAFETY SUMMARY  
pénétrer dans appareil. Ne pas placer  
de r´cipients contenant un liquide sur  
cet appareil, ni à proximité de celui-  
ci.  
nicht in der Nähe von  
ENGLISH  
wärmeabstrahlenden Haushaltsgeräten  
(z.B. Heizgerät oder Herd) aufstellen.  
Im Inneren diesem Gerät herr-schen  
potentiell gefährliche Spannungen.  
Nicht versuchen, das Gerät zu öffnen.  
Es enthält keine vom Benutzer  
reparierbaren Teile. Reparaturen  
dürfen nur von ausgebildetem  
Kundenienstpersonal durchgeführt  
werden.  
To reduce the risk of electric shock,  
disconnect the unit from the AC  
mains before installing audio cable.  
Reconnect the power cord only after  
making all signal connections.  
Connect the unit to a two-pole, three  
wire grounding mains receptacle. The  
receptacle must be connected to a  
fuse or circuit breaker. Connection to  
any other type of receptacle poses a  
shock hazard and may violate local  
electrical codes.  
Do not allow water or any foreign  
object to get inside the unit. Do not  
put objects containing liquid on, or  
near, the unit.  
To reduce the risk of overheating  
the unit, avoid exposing it to direct  
sunlight. Do not install the unit near  
heat-emitting appliances, such as a  
room heater or stove.  
Pour éviter une surchauffe de  
appareil, conserver-la à labri du  
soleil. Ne pas installer à proximité  
dappareils dégageant de la chaleur  
tels que radiateurs ou appareils de  
chauffage.  
Ce appareil contient des circuits haute  
tension présentant un danger. Ne  
jamais essayer de le démonter. Il  
ny a aucun composant qui puisse  
être réparé par lutilisateur. Toutes  
les réparations doivent être effectuées  
par du personnel qualifié et agréé par  
le constructeur.  
ESPAÑOL  
Para reducir el riesgo de descarga  
eléctrica, desconecte de la red el  
aparato antes de instalar el cable de  
señalización de interfaz de la segnale.  
Vuelva a conectar el conductor  
flexible de alimentación solamente  
una vez efectuadas todas las  
interconexiones de señalizatción.  
Conecte el aparato a un tomacorriente  
bipolar y trifilar con neutro de  
puesta a tierra. El tomacorriente  
debe estar conectado a la protección  
de derivación apropiada (ya sea un  
fusible o un disyuntor). La conexión  
a cualquier otro tipo de tomacorriente  
puede constituir peligro de descarga  
eléctrica y violar los códigos  
DEUTSCH  
Um die Gefahr eines elektrischen  
Schlages auf ein Minimum zu  
reduzieren, den Gerät vom Stromnetz  
trennen, bevor ggf. ein  
This unit contains potentially  
hazardous voltages. Do not attempt  
to disassemble the unit. The unit  
contains no user-serviceable parts.  
Repairs should be performed only by  
factory-trained service personnel.  
Audio-Schnittstellensignalkabel  
angeschlossen wird. Das Netzkabel  
erst nach Herstellung aller  
Signalverbindungen wieder  
einstecken.  
Der Gerät an eine geerdete zweipolige  
Dreiphasen-Netzsteckdose  
FRANÇAIS  
eléctricos locales.  
Pour réduire le risque d’électrocution,  
débrancher la prise principale de  
appareil, avant dinstaller le câble  
dinterface allant à laudio. Ne  
rebrancher le bloc dalimentation  
quaprès avoir effectué toutes les  
connections.  
Branchez appareil dans une prise de  
courant à 3 dérivations (deux pôles et  
la terre). Cette prise doit être munie  
dune protection adéquate (fusible ou  
coupe-circuit). Le branchement dans  
tout autre genre de prise pourrait  
entraîner un risque d’électrocution et  
peut constituer une infraction à la  
réglementation locale concernant les  
installations électriques.  
anschließen. Die Steckdose muß  
mit einem geeigneten Abzweigschutz  
(Sicherung oder Leistungsschalter)  
verbunden sein. Der Anschluß der  
No deje que en el aparato entre agua  
ni ningún objeto extraño. No ponga  
objetos con líquidos encima de la  
unidad ni cerca de ella.  
unterbrechungsfreien Stromversorgung Para reducir el riesgo de  
an einen anderen Steckdosentyp kann  
zu Stromschlägen führen und gegen  
die örtlichen Vorschriften verstoßen.  
Darauf achten, daß weder Wasser  
noch Fremdkörper in das Innere den  
Gerät eindringen. Keine Objekte, die  
Flüssigkeit enthalten, auf oder neben  
die unterbrechungsfreie  
sobrecalentamiento, no exponga la  
unidad a los rayos directos del sol  
ni la instale cerca de artefactos que  
emiten calor, como estufas o cocinas.  
Este aparato contiene niveles de voltaje  
peligrosos en potencia. No intente  
desarmar la unidad, pues no contiene  
piezas que puedan ser repardas por  
el usuario. Las reparaciones deben  
efectuarse únicamente por parte del  
personal de mantenimiento capacitado  
en la fábrica.  
Stromversorgung stellen.  
Um ein Überhitzen dem Gerät zu  
verhindern, das Gerät vor direkter  
Sonneneinstrahlung fernhalten und  
Ne pas laisser de leau ou tout objet  
3
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THE MTS-4A: INTRODUCTION  
The Meyer MTS-4A self-powered loudspeaker is a compact,  
self-contained, full-range system suited for clubs and small  
theatres (throw distances less than 100 ft). Its trapezoidal  
shape facilitates array design that maximizes coverage and  
SPL for the size of the array. Since all frequencies are produced  
from one cabinet, the MTS-4A better approximates a point-  
source radiator, creating a smoother frequency image than  
separate mid-hi and subwoofer cabinets. The MTS-4A can be  
used as a PA, front-fill, bass, and keyboard speaker, and as a  
side-fill and drum monitor.  
enclosure. This integrated design improves performance,  
durability, and reliability, eliminates amplifier racks, and  
simplifies setup and installation. The MTS-4A has the  
following acoustical specifications:  
Frequency Response  
Phase Response  
Coverage  
3 dB 30 Hz 16 kHz  
70° 90 Hz 17.2 kHz  
70° H x 60° V  
Dynamic Range  
>110 dB  
See 12 for complete specifications.  
The MTS-4A contains independent amplifier and control  
electronics for three low frequency cone drivers (18, 15,  
12), and one high frequency horn driver (4diaphragm,  
2throat). Each driver is contained in a separate vented  
The MTS-4A can be equipped to operate with the Remote  
Monitoring System (RMS) interface network and software  
application.  
1
AC POWER  
If the voltage decreases below the lower bound of either  
operating 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 MTS-4A continues to  
operate during brown-out depends on how low the voltage  
drops and the audio source level during this period.  
When AC power is applied to the MTS-4A, the Intelligent AC™  
supply automatically selects the correct operating voltage,  
allowing the MTS-4A to be used in the US, Europe, or Japan  
without manually setting a voltage switch. The Intelligent AC  
power supply also performs surge suppression for high voltage  
transients (up to 275 V), minimizes inrush current, and filters  
EMI. Continuous voltages above 275 VAC may damage the  
unit! The MTS-4A uses a NEMA L6-20P or IEC 309 male power  
inlet and satisfies UL, CSA, and EC safety standards.  
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.  
VOLTAGE REQUIREMENTS  
The MTS-4A operates safely and without audio discontinuity if  
the AC voltage stays within the ranges 85134 V or 165264  
V, at 50 or 60 Hz. Immediately after applying AC power, the  
green Active LED on the user panel illuminates and the proper  
operating 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.  
If the MTS-4A 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 MTS-4A does not turn back on after ten seconds, remove  
AC power and refer to the Note above.  
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 service  
center.  
NOTE: We recommend that the power supply be operated  
at least a few volts away from the upper and lower  
bounds of the operating windows to avoid brown-out  
and possible shutdown.  
CURRENT REQUIREMENTS  
The MTS-4A 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  
1. 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.  
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circuit breakers heat up (and trip) at varying rates, it is  
essential to understand the types of current ratings and how  
they correspond to circuit breaker and cable specifications.  
If the colors referred to in the diagram don't correspond to the  
terminals in your plug, use the following guidelines:  
Connect the blue wire to the terminal marked with an N  
or colored black.  
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 used to select the rating for slow-reacting thermal  
breakers.  
Connect the brown wire to the terminal marked with an L  
or colored red.  
Connect the green and yellow wire to the terminal marked  
with an E (or ) or colored green (or green and yellow).  
SAFETY ISSUES  
Pay close attention to these important electrical and safety  
issues.  
The maximum burst RMS current is the maximum RMS  
current over a one second duration. It is used to select the  
rating for most magnetic breakers.  
The maximum instantaneous peak current during burst is  
used to select the rating for fast-reacting magnetic breakers  
and to calculate the peak voltage drop in long AC cables  
according to the formula  
Use a power cord adapter to drive the MTS-4A  
from a standard 3-prong outlet (NEMA 5-15R; 125  
V max).  
Vpkdrop = Ipk x Rtotal cable  
brown = hot  
blue =  
neutral  
Use the table below as a guide to select cables and circuit  
breakers with appropriate ratings for your operating voltage.  
yellow/green =  
earth ground  
(chassis)  
115V 230V 100V  
Max. Continuous RMS  
Max. Burst RMS  
14A  
7A  
13A  
18A  
16 A  
30 A  
42A  
The MTS-4A requires a grounded outlet. Always use a  
grounding adapter when connecting to ungrounded  
outlets.  
26 A  
Max. Peak During Burst 38 A  
The minimum electrical service amperage required by a system  
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.  
Do not use a ground-lifting adapter or cut the AC  
cable ground pin.  
Note: In the unlikely case that the circuit breakers trip  
(the white center buttons pop out), do not reset the  
breakers! Contact Meyer Sound for repair information.  
Keep all liquids away from the MTS-4A to avoid hazards from  
electrical shock.  
POWER CONNECTOR WIRING CONVENTIONS  
Use the following AC cable wiring diagram to create  
international or special-purpose power connectors:  
Do not operate the unit if the power cables are frayed 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.  
earth  
ground  
chassis  
ground  
AC cable color code  
5
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AUDIO INPUT  
with XLR connectors for balanced signal sources.  
The MTS-4A presents a 10 kbalanced input impedance to a  
three-pin XLR connector wired with the following convention:  
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.  
Pin 1 220 kto chassis and earth ground (ESD clamped)  
Pin 2 Signal  
Pin 3 Signal  
Case  
Earth (AC) ground and chassis  
A single source can drive multiple MTS-4As with a paralleled  
input loop, creating an unbuffered hardwired loop connection.  
Make certain that the source equipment can drive the total  
load impedance presented by the paralleled input circuit. For  
example, since the input impedance of a single MTS-4A is  
10 k, cascading 20 MTS-4As produces a balanced input  
impedance of 500. If a 150source is used, the 500load  
results in a 2.28 dB loss.  
Shorting an input connector pin to the case can  
form a ground loop and cause hum.  
Pins 2 and 3 carry the input as a differential signal; their  
polarity 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  
AMPLIFICATION AND PROTECTION CIRCUITRY  
Each driver in the MTS-4A is powered by one channel of the  
Meyer MP-4, a four-channel 2480 W amplifier (620 W/ch)  
utilizing complementary power MOSFET output stages (class  
AB/H). The following sections discuss the MP-4s limiting  
circuitry and the four-fan cooling system.  
is hard limiting with these negative consequences:  
Increasing the input level will not increase the volume.  
The system distorts due to clipping and nonlinear driver  
operation.  
Unequal limiting between the drivers alters the frequency  
response.  
TRUPOWERLIMITING SYSTEM  
Driver and amplifier components are subjected to maximum  
heat, which shortens their life-span.  
Conventional limiters assume that the resistance of a speaker  
remains constant and set the limiting threshold by measuring  
voltage only. This method is inaccurate because the speakers  
resistance changes in response to the frequency content  
of the source material and thermal variations in the  
speakers voice coil and magnet. Conventional limiters begin  
limiting prematurely, which under-utilizes system headroom  
and deprives the speaker of its full dynamic range.  
The TPL LEDs can indicate an imbalance in a system of  
speakers by functioning like a spectrum analyzer. If speakers  
in a subwoofer, mid-bass, or mid-hi subsystem begin to limit  
before reaching the required operating level for the entire  
system, then that subsystem needs to be supplemented with  
additional speakers.  
NOTE: Although the TPL limiters exhibit smooth sonic  
characteristics, we do not recommend using them  
for intentional compression effects. Use an outboard  
compressor/limiter to compress a mixed signal.  
The TruPower limiting (TPL) system accounts for varying  
speaker impedance by measuring current, in addition to  
voltage, to compute the power dissipation and voice coil  
temperature. TPL improves performance before and during  
limiting by allowing the speaker to produce its maximum SPL  
across its entire frequency range. TPL also extends the lifetime  
FANS AND COOLING SYSTEM  
of the drivers by controlling the temperature of the voice coil. The MTS-4A uses a forced-air cooling system with four fans  
Sub Limit, Lo Limit, Mid Limit, and Hi Limit LEDs on the  
user panel indicate TPL activity for each of the four amplifier  
channels. When any channel exceeds the safe continuous  
power level, that channels limiter engages, ceasing operation  
when the power level returns to normal. The limiters for each  
channel function independently and do not affect the signal  
when the LEDs are inactive.  
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.  
A foam insert filter, in combination with the entire front grill  
surface, acts as an air filter for the cooling system. Despite  
the filtering, extensive use or a dusty operating environment  
can allow dust to accumulate along the path of the  
The MTS-4A performs within its acoustical specifications and  
operates at a normal temperature if a given TPL LED is on for  
no longer than two seconds, and off for at least one second. If airflow, preventing normal cooling. We recommend periodically  
an LED remains on for longer than three seconds, that channel removing the grill, filter, and amplifier module and using  
6
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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.  
at close proximity without an audio signal and turn on in  
response to  
primary fan failure (check its status immediately);  
accumulation of dust in the cooling system path;  
a prolonged period of high source levels in hot  
temperatures or direct sunlight;  
Two variable-speed primary fans run continuously with an  
inaudible operating noise of 22 dBA at 1 m at their slowest  
speed. When the temperature of the heatsinks reaches 42°C,  
the primary fans begin increasing their speed, reaching full  
driver failure.  
speed at 62°C . At full speed, they are barely audible near the Troubleshooting Note: In the highly unlikely event that the  
cabinet, even without an audio signal.  
secondary fans do not keep the temperature below 85°C, the  
MTS-4A automatically shuts down until AC power is removed  
and reapplied. If the MTS-4A shuts down again after cooling  
and reapplying AC power, contact Meyer Sound for repair  
In the unusual event that the heatsink temperature reaches  
74°C, the secondary fans turn on; they turn off when the  
temperature decreases to 68°C. The secondary fans are audible information.  
RIGGING  
The MTS-4A weighs 280 lb (127 kg). The maximum  
Rigging load ratings assume a straight tensile pull and that  
recommended load for a single cabinet with aircraft pan  
fittings is 600 lb (273 kg). This working load is based on a  
5:1 safety factor. The MTS-4A has five rigging brackets (three  
the cabinet is in new condition with aircraft pan fittings. If  
these conditions are not met, the load ratings can be  
reduced significantly. Load ratings can also be reduced by  
on top, two on bottom). Each bracket is capable of supporting age, wear, and damage. It is important to inspect the rigging  
the full working load of the cabinet.  
hardware regularly and replace worn or damaged components  
immediately.  
rigging brackets  
(three on top, two on bottom)  
The cabinet, exposed electronic circuitry, 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.  
Note: All Meyer Sound products must be used in accordance  
with local, state, federal, and industry regulations.  
It is the owners and/or users responsibility to  
evaluate the reliability of any rigging method for their  
application. Rigging should be done only by experienced  
professionals.  
Handles are for carrying only.  
Do not use them for rigging!  
There are four types of interchangeable rigging brackets, each  
fastened by six Phillips screws:  
aircraft pan fittings (ring and stud)  
3/8-16 nut plates  
M-10 x 1.5 metric nut plates  
blank plates (if no rigging brackets are requested)  
Note: Units with nut plates are rated for the weight of one  
cabinet only.  
7
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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  
recommend using the Meyer Sound SIM® System II Sound  
Analyzer1 and CP-10 Parametric Equalizer2 to  
dB/oct, Q = 0.8) that performs a crossover function for the  
Mid-Hi output.  
The DS-2 & Sub Crossover switch (channels 1 and 2 only)  
activates a crossover network optimized for the DS-2P or  
DS-4P when used with the 650-P. With the switch in,  
frequencies below 80 Hz are sent to the Sub output (for  
the 650-P), and above 80 Hz to the DS-2 output. When  
the 650-P is used without the DS-2P or DS-2P, the switch  
should be out, which sends a full-range signal to both the  
DS-2 and Sub outputs.  
The DS-2 f and Sub f switches (channels 1 and 2 only)  
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.  
assist the process of choosing and configuring speakers;  
measure propagation delays between subsystems to set the  
correct polarity and delay times;  
measure and equalize variations in frequency response  
caused by the acoustical environment and the placement  
and interaction of speakers.  
Contact Meyer Sound for assistance with your application.  
We recommend using one of the Meyer Sound line drivers to  
integrate different types of Meyer self-powered speakers into  
a complete system. The LD-1A and LD-2 have two channels  
equipped to control a full-range main system, and the LD-1A  
has six auxiliary channels for down-fill, front-fill, and delay  
systems. The LD-1A maintains signal integrity for long cable  
paths and provides the following useful functions:  
POLARITY NOTE: The polarity for Meyer Sound self-powered  
speakers may be reversed using the input polarity switch on  
the user panel. The line drivers also allows polarity reversal  
with the DS-2 f and Sub f switches for speakers connected  
to the DS-2 and Sub outputs. When making polarity decisions  
in applications that include the LD-1A or the LD-2, check the  
state of all polarity switches.  
The Lo Cut switch activates a high-pass filter (160 Hz, 12  
COMPLETE SYSTEMS  
MEYER SPEAKER TYPES  
The following Meyer speakers are mentioned in the example  
applications.  
response exhibits a rise in the range 30160 Hz. It is  
important to emphasize that the speakers are in phase in  
this region. This rise can be corrected using the Meyer CP-10  
Parametric Equalizer, if desired.  
CQ  
PSW-4  
650-P  
Self-powered mid-hi speaker  
Self-powered subwoofer  
Self-powered subwoofer  
input  
CP-10 EQ  
MTS-4A  
(1 Channel)  
The Meyer self-powered speakers listed above have a loop  
connection to send the input signal to another speaker.  
Full-range signals can be applied to all Meyer self-powered  
subwoofers because they have built-in active crossovers that  
filter mid-hi frequencies.  
loop  
PSW-4  
MTS-4A AND PSW-4  
Combining the PSW-4 with the MTS-4A doubles the low  
frequency power of the system because both loudspeakers  
contain the same sub and low drivers. Due to the summation  
between the PSW-4 and the MTS-4A, the system frequency  
The LD-1A/2 with an MTS-4A and PSW-4  
Set the MTS-4A and PSW-4 to the same polarity.  
1. The Meyer Sound SIM II is a computer-based dual channel FFT 2. The CP-10 is a dual-channel, complimentary phase, precision analog  
analysis system optimized for electroacoustic measurement.  
equalizer with five bands of parametric equalization and two bands  
of shelving filters.  
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The CH 1 Mid-Hi and CH 3 outputs drive the upper and lower  
MTS-4A arrays, respectively, applying appropriate levels for  
speakers directed at different distances. CH 3 is delayed to  
phase align the upper and lower systems in the intersecting  
coverage area.  
LD-1A WITH FLOWN MTS-4A AND CQ; 650-P ON THE  
FLOOR  
This example shows the LD-1A integrating a complete system  
of self-powered speakers for a large venue. Although channels  
1, 3, and 5 constitute half of the system, channels 2, 4, and  
6 can be used with identical connections to create the other  
half. The upper and lower MTS-4A arrays and CQ down-fills are  
flown; the 650-P subwoofers are on the floor.  
Since the MTS-4A arrays are driven by full-range signals, the  
Lo Cut switches for the CH 1 Mid-Hi and CH 3 outputs should  
be out. The Array EQ switches should also be out because the  
Array EQ filter is designed for the MSL-4, not the MTS-4A.  
Since the DS-P Series is not included in this system, the DS-2  
& Sub Crossover switch should be out.  
MTS-4A Upper System  
LD-1A  
CH 1  
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-fills  
coverage area. To insure that the systems combine properly  
in this area:  
Ch A  
CP-10 EQ  
Ch B  
Input  
Mid-Hi  
Output  
A
B
Sub  
Delay  
Output  
Input  
Output  
Set the CQ to the opposite polarity to the MTS-4A to phase  
align the mid-hi frequencies and minimize the MTS-4As low  
frequency down-lobe.  
CH 3  
MTS-4A Lower System  
Input  
Output  
CP-10 EQ  
CH 5  
Use the CH 5 Lo Cut filter to eliminate the low frequency  
rise caused by the overlap with the 650-P/MTS-4A systems.  
Delay the down-fill to align with the MTS-4A system in  
their intersecting coverage area.  
CQ Down-fills  
650-P Subwoofers  
The polarity of the 650-P depends on the height and  
distance of the measurement position from the flown and  
subwoofer systems. The entire system should be measured,  
phase-aligned, and equalized using the SIM System II Sound  
Analyzer and CP-10 Parametric Equalizer.  
The LD-1A with MTS-4As, CQs, and 650-P Subwoofers  
Set the MTS-4A and CQ to the same polarity. The polarity  
for the 650-P depends on the distance of the measurement  
position from the flown and subwoofer systems.  
DRIVER TROUBLESHOOTING  
TROUBLESHOOTING WITH TPL  
TPL LEDs. Contact Meyer Sound for more information  
about RMS.  
The TPL LED can indicate serious driver problems, if  
interpreted correctly. If one MTS-4A 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 MTS-4A down immediately.  
DRIVER REPLACEMENT  
To determine whether the high or low drivers are functioning  
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 High Driver Inspection and Evaluation Procedure for  
Self-Powered Series Products (part # 17.010.120.02).  
The TPL circuit does not activate if there is no power  
dissipation in the driver, regardless of the input signal level.  
Therefore, if all MTS-4As 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.  
VERIFYING DRIVER POLARITY  
Incorrect driver polarity impairs system performance and may  
damage the drivers. All Meyer loudspeakers are shipped with  
the drivers in correct alignment. However, if the driver or  
circuit 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.  
NOTE: The Remote Monitoring System (RMS) provides precise  
information about peak power, peak voltage, and  
average voltage (VU) for each amplifier channel,  
enabling a more complete driver diagnostic than the  
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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  
The polarity is correct if the frequency response is smooth  
through each crossover region (40 Hz, 100 Hz, 1 kHz).  
Cancellation greater than 6 dB in any region indicates polarity  
reversal between the drivers on either side of that crossover  
discern variations in phase response with respect to frequency, point.  
it provides no useful information about the phase response  
POLARITY BETWEEN ADJACENT LOUDSPEAKERS  
Use the following test procedure to verify the polarity  
between two adjacent loudspeakers of the same type:  
through the crossover, the most important consideration for  
determining correct driver polarity.  
Phase poppers are, therefore, not useful for performing phase  
measurements on an individual loudspeaker or a full-range  
sound system containing one or more crossovers. If necessary,  
apply a phase popper only to loudspeakers with identical  
drivers without a crossover, and check the systems overall  
phase response with a frequency analyzer and/or listening  
test.  
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.  
NOTE: Since polarity reversal causes excessive driver excursion  
at high source levels, use moderate levels for these  
tests.  
The polarity is correct if the frequency response remains  
constant with a significant increase in amplitude. Broadband  
cancellation (decreased overall level) indicates polarity  
reversal.  
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 12and  
15drivers.  
NOTE: Polarity tests among more than two speakers may  
damage the drivers in the cabinet with reversed  
polarity.  
2. Connect a signal source to the loudspeaker and note the  
frequency response.  
This driver is 180 out of  
phase to the other drivers  
Drivers with correct  
polarity cause acoustic  
addition  
Drivers with reversed  
polarity cause acoustic  
cancellation  
ARRAY DESIGN  
BACKGROUND  
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 arrays  
coverage area.  
Creating an effective array with the MTS-4A 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.  
NOTE: The trapezoidal shape of the MTS-4A does not represent  
the horizontal coverage area of the speaker. Tight-  
packing MTS-4As results in the minimum recommended  
splay angle (15°) for horizontal arrays.  
As the splay angle (the angle between adjacent cabinet faces)  
decreases below the coverage angle of the individual speaker,  
the on-axis power increases, but the coverage overlap between  
adjacent speakers causes comb filtering and other frequency  
response variations.  
10  
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(without a nearby wall or ceiling) do not. In general,  
subwoofers in half-space generate twice the SPL (+6 dB)  
compared to the same number in free-space.  
ARRAY DESIGN FOR LOW FREQUENCIES  
Since the MTS-4A contains sub and low frequency drivers, in  
addition to mid and high drivers, array design for the MTS-4A  
must incorporate the different array response of high and low  
frequencies. The beam width for a single speaker widens as  
the frequency decreases. Frequencies below 125 Hz are mostly  
omnidirectional while higher frequencies are more directional.  
NOTE: SPL values refer to an on-axis measurement position.  
The actual SPL addition and narrowing of coverage  
varies with frequency and depends on the physical  
displacement between cabinets, loading conditions, and  
room acoustics.  
NOTE: H and V are abbreviations for horizontal and vertical.  
MTS-4A COVERAGE AND MAXIMUM SPL  
The low frequencies of adjacent arrayed speakers exhibit  
on-axis addition and off-axis cancellation, resulting in a  
narrowing of coverage in the dimension in which they are  
arrayed. A H array of two MTS-4As narrows the H coverage  
without affecting the V coverage. A V array of two MTS-4As  
narrows the V, without affecting the H coverage. In both  
cases, there is 3 to 6 dB SPL of on-axis low frequency (LF)  
addition compared to a single MTS-4A. Due to the larger  
distance between LF drivers in V, compared to H arrays, the  
V coverage narrows at a faster rate than does the H coverage  
for H arrays, given the same array size and adjacent speaker  
placement.  
A series of outdoor tests was conducted at Meyer Sound to  
determine the coverage angle and on-axis SPL for arrays with  
one and two horizontal rows of up to five speakers 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 to 1 m. The coverage angle for the  
array is the result of averaging the 6 dB points from 125  
Hz to 8 kHz.  
The horizontal angles in the tables below represent the  
optimal narrow (15°), middle (30°), and wide (45°)  
orientations for the MTS-4A. The vertical splay angles  
represent the optimal narrow and wide configurations. 2@0°  
LT denotes long throw: the two horns are coupled directly  
together (top speaker upside down/bottom speaker upright) to  
form a single narrow horn.  
Increasing the number of MTS-4As in the array increases the  
LF directional control. A properly designed V array steers  
low frequencies to include balconies and upper tiers, while  
a H array focuses low frequencies for longer throw distances  
without interacting with the walls.  
The table on this page shows the SPL and coverage angles  
that result from grouping the MTS-4A in arrays of up to five  
units horizontally and two rows vertically. All splay angles  
refer to the angle between cabinet centers.  
LOADING  
One of the most important factors governing LF response is  
speaker placement with respect to adjacent surfaces. The MTS-  
4A gains significant LF power by coupling with nearby floors  
and walls. Half-space loading describes a speaker coupling  
with one surface. Speakers placed on the floor benefit  
from half-space loading, while flown speakers in free-space  
If this information does not address your application  
requirements, contact Meyer Sound to obtain additional  
information on array design.  
MTS-4A Array Coverage and Maximum SPL  
Number of Horizontal  
MTS-4As @ Angle  
1
2 @ 15˚  
2 @ 30˚  
2 @ 45˚  
3 @ 15˚  
3 @ 30˚  
3 @ 45˚  
Coverage Max Peak Coverage  
Max Peak Coverage  
Max Peak Coverage  
Max Peak Coverage  
Max Peak Coverage  
Max Peak Coverage  
Max Peak  
H
V
dB SPL  
H
V
dB SPL  
H
V
dB SPL  
H
V
dB SPL  
H
V
dB SPL  
H
V
dB SPL  
H
V
dB SPL  
Vertical Rows of MTS-4As  
@ Angle  
1
70˚ 60˚  
70˚ 30˚  
70˚ 50˚  
70˚ 90˚  
140  
146  
145  
143  
50˚ 60˚  
50˚ 30˚  
50˚ 50˚  
50˚ 90˚  
146  
152  
151  
149  
60˚ 60˚  
60˚ 30˚  
60˚ 50˚  
60˚ 90˚  
145  
151  
150  
148  
100˚ 60˚  
100˚ 30˚  
100˚ 50˚  
100˚ 90˚  
142  
148  
147  
145  
80˚ 60˚  
80˚ 30˚  
80˚ 50˚  
80˚ 90˚  
149  
155  
154  
152  
120˚ 60˚  
120˚ 30˚  
120˚ 50˚  
120˚ 90˚  
147  
153  
152  
150  
150˚ 60˚  
150˚ 30˚  
150˚ 50˚  
150˚ 90˚  
145  
151  
150  
148  
2 @ 0˚ (LT)  
2 @ 15˚  
2 @ 30˚  
Number of Horizontal  
MTS-4As @ Angle  
4 @ 15˚  
4 @ 30˚  
4 @ 45˚  
5 @ 15˚  
5 @ 30˚  
5 @ 45˚  
Coverage Max Peak Coverage  
Max Peak Coverage  
Max Peak Coverage  
Max Peak Coverage  
Max Peak Coverage  
Max Peak  
H
V
dB SPL  
H
V
dB SPL  
H
V
dB SPL  
H
V
dB SPL  
H
V
dB SPL  
H
V
dB SPL  
Vertical Rows of MTS-4As  
@ Angle  
1
100˚ 60˚  
151  
157  
156  
154  
140˚ 60˚  
140˚ 30˚  
140˚ 50˚  
140˚ 90˚  
148  
154  
153  
151  
190 60˚  
190 30˚  
190 50˚  
190 90˚  
146  
152  
151  
149  
110˚ 60˚  
110˚ 30˚  
110˚ 50˚  
110˚ 90˚  
153  
159  
158  
156  
180˚ 60˚  
180˚ 30˚  
180˚ 50˚  
180˚ 90˚  
148  
154  
153  
151  
240 60˚  
240 30˚  
240 50˚  
240 90˚  
146  
152  
151  
149  
2 @ 0˚ (LT) 100˚ 30˚  
2 @ 15˚  
2 @ 30˚  
100˚ 50˚  
100˚ 90˚  
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MTS-4A SPECIFICATIONS  
Acoustical1  
Operating Frequency Range2  
Free Field  
26 Hz - 18 kHz 6 dB  
32 Hz - 16 kHz 4 dB  
30 Hz - 16 kHz 4dB  
70° 90 Hz - 17.2 kHz  
140 dB  
(each loudspeaker)  
Half-Space  
Phase Response  
Maximum Peak SPL3  
Signal to Noise Ratio  
>100 dB (A weighted noisefloor to max SPL)  
Coverage  
-6 dB at 70° H x 60° V  
Transducers  
Sub Frequency  
Low Frequency  
Mid Frequency  
High Frequency  
18-inch cone driver  
15-inch cone driver  
12-inch cone driver  
2-inch throat (4-inch diaphragm) compression driver  
Audio Input  
Amplifiers  
AC Power  
Type  
Connector  
10k impedance, electronically balanced  
XLR (A-3) male and female  
+4 dBu  
Nominal Input Level  
Type  
Burst capability  
THD, IM, TIM  
Complementary power MOSFET output stages (audio class AB/H)  
2480 watts (620 Wrms/channel x 4)  
< .02 %  
Connector  
250V NEMA L6-20P (twistlock) inlet or IEC 309 male inlet or  
Multipin VEAM option  
95-125 VAC and 208-235 VAC; 50 Hz / 60 Hz4  
Turn on: 85 VAC; Turn off 134 VAC; 50/60 Hz  
Turn on: 165 VAC; Turn off 264 VAC; 50/60 Hz  
Automatic voltage selection  
Operational Voltage Range  
Max Continuous RMS Current (>10 sec)  
Burst RMS Current (< 1 s)  
Max Peak Current During Burst  
Soft Start Turn-on  
@115 V: 14 A  
@115 V: 26 A  
@115 V: 36 Apk  
@230 V: 7 A  
@230 V: 13 A  
@230 V: 18 Apk  
@100 V: 16 A  
@100 V: 30 A  
@100 V: 42 Apk  
Inrush current < 12A @ 115V  
Physical  
Dimensions  
Height: 56.75" (1441 mm); Width: 21.26" (539 mm);  
Depth: 30" (762 mm)  
Weight  
Enclosure  
Finish  
Protective Grill  
Rigging  
280 lbs (127 kg)  
Multi-ply hardwood  
Black textured  
Perforated metal grill  
Aircraft pan fittings (3 on top, 2 on bottom).  
1
Working load for each fitting is 600 lbs, which is ⁄5 the  
cabinet breaking strength (with straight tensile pull).  
1
Notes  
1. Measurements are taken at 4 m on-axis, /3 octave, unless otherwise stated.  
2. Response depends on loading conditions and room acoustics.  
3. 1m, with pink noise or music, 1/2 space.  
Copyright © 2000 Meyer Sound Laboratories, Inc.  
All Rights Reserved  
4. The unit is rated at 88-125V and 182-235V, 50/60 Hz, to satisfy EC standards  
12  
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MTS-4A DIMENSIONS  
All units in inches  
10.63  
21.97  
13.00  
21.26  
13.16  
13.36  
30.26  
30.00  
Bottom  
Top 7.5  
14.125  
56.75  
28.5  
Side  
Front  
REAR PANEL DETAIL  
MTS-4A  
13  
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CONTACT INFORMATION  
Meyer Sound Laboratories, Inc.  
2832 San Pablo Avenue  
Berkeley, CA 94702  
tel: 510.486.1166  
fax: 510.486.8356  
05.029.006.02 Rev A  
14  
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