Meyer Sound 650-P User manual

Copyright © 1997, Meyer Sound Laboratories,
Inc. All rights reserved
art #: 05.036.007.01 Rev B
Patents Pending
Operating Instructions
650-P
Self-Powered Subwoofer

2
Contents
Introduction ......................................................... 3
AC Power ............................................................ 3
Audio Input .......................................................... 5
Amplification and Protection Circuitry .................. 5
Configuration, Placement, and Polarity ...............7
Measurement and System Integration Tools ......
Full-Range Systems ..........................................
Driver Troubleshooting .....................................10
Safety Summary ..............................................11
Specifications ...................................................12
Controls and Connectors ................................... 13
Dimensions........................................................ 14
Notes ...............................................................15
Contact Information ..........................................16
The product herewith complies with the requirements of
the Low Voltage Directive 73/23/EEC and the EMC
Directive 89/336/EEC.
declares that the product:The Manufacturer:
Product Name: 650-P
Product Options: All
Name: Meyer Sound Laboratories
Address: 28 2 San Pablo Avenue
Berkeley, California 94702-2204, USA
conforms to the following Product Specifications:
Safety: EN 60065: 1994
EMC: 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 Lines,
U
U
L
L
C
C
U
U
L
L
®®
LISTED
3K59
COMMERCIAL
AUDIO SYSTEM
Office of Quality Manager
Berkeley, California USA
October 1, 1995
Shock: 30 g 11 msec half-sine
on each of 6 sides
Vibration: 10  55Hz (0.010 m
peak-to-peak excursion)
Operating temperature: 0°C to +45°C
Nonoperating temp: < 40°C or > +75°C
Humidity: to 95% at 35°C
Operating altitude: to 4600 m (15,000 ft)
Nonoperating altitude: to 6300 m (25,000 ft)
Environmental Specifications for Meyer
Sound Electronics Products
1.0kV ower Lines
!
our indiquer les risques
résultant de tensions
dangereuses
Zu die gefahren von
gefährliche spanning zeigen
Important operating instruc-
tions
our indequer important
instructions
Frame or chassis
Masse, châssis
Rahmen oder chassis
rotective earth ground
Terre de protection
Die schutzerde
ara indicar azares provengo
de peligroso voltajes
ara indicar importante funcionar
y mantenimiento instrucciones Armadura o chassis Tierra proteccionista
These symbols indicate important safety or operating features in this booklet and on the chassis.
Dangerous voltages:
risk of electric shock
Symbols Used
Zu wichtige betriebs-
anweisung und unter-
haltsanweisung zeigen
According to ISO/IEC Guide and EN 45014
Declaration of Conformity

3
Introduction
The 650-P, Meyer Sound’s most powerful self-powered
subwoofer, contains independent amplifier and control
electronics for two 18” drivers in a compact enclosure.
This integrated design improves performance, durability,
and reliability, eliminates amplifier racks, and simplifies
setup and installation.
The 650-P has the following acoustical specifications:
Frequency Response ±4 dB 28  100 Hz
Phase Response ± 0° 45  145 Hz
Dynamic Range > 110 dB
See page 14 for complete specifications.
The 650-P is compatible with the Meyer MSL-4, CQ™
Series, and MTS-4 self-powered speakers and can be
used in any system requiring additional low frequency
reinforcement..
The 650-P 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
amplifiertemperature for all speakers in the network
on a Windows-based PC. Contact Meyer Sound for
more information about RMS.
AC Power
When AC power is applied to the 650-P, the Intelligent
AC™ supply automatically selects the correct operating
voltage, allowing the 650-P to be used in the US, Eu-
rope,orJapanwithoutmanuallysettingavoltageswitch.
The Intelligent AC power supply also protects the 650-
P by performing surge suppression for high voltage tran-
sients (up to 275V), minimizing inrush current, and
filtering EMI. The 650-P uses a NEMA L6-20P or IEC
309 male power inlet and satisfies UL, CSA, and EC
safety standards.
Continuous voltages above 275VAC may damage
the unit!
VoltageRequirements
The 650-P operates safely and without audio discon-
tinuity if the AC voltage stays within the ranges 85–
134V or 165–264V, at 50 or 60Hz. Immediately after
applying AC power, the green Active LED on the user
panel illuminates and the proper 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.
TROUBLESHOOTING NOTE: If the Active LED does not
illuminate or the system does not respond to audio input
after ten seconds, remove AC power to avoid possible
damage to the unit. Experienced electronics technicians
with access to a test bench can verify proper operation
for the power supply and amplifier system with The
Meyer Sound Self-Powered Series MP-2 and MP-4 Field
Verification Procedure (part # 17.022.066.01; contact
Meyer Sound to receive this document). All other users
should contact Meyer Sound or an authorized Meyer
service center.
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 650-P
continues to operate during brown-out depends on how
low the voltage drops and the audio source level during
this period.
If the voltage fluctuates within either operating range,
automatic tap selection stabilizes the internal operating
voltage. This tap selection is instantaneous and there
are no audible artifacts. If the voltage increases above
the upper bound of either range, the power supply
turns off rapidly, preventing damage to the unit.
If the 650-P 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 650-P does not turn back on after
tenseconds,removeACpowerandrefertotheTROUBLE-
SHOOTING NOTE above.

4
CurrentRequirements
The 650-P presents a dynamic load to the AC mains
which causes the amount of current to fluctuate be-
tween quiet and loud operating levels. Since different
types of cables and 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.
The maximum continuous RMS current is the maxi-
mum RMS current over a duration of at least 10 sec-
onds. 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.
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.
Themaximuminstantaneouspeakcurrentduringburst
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
Vpkdrop = Ipk x Rtotal cable
Use the table below as a guide to select cables and
circuit breakers with appropriate ratings for your oper-
ating voltage.
sgnitaRtnerruCP-056
V511 V032 V001
SMRsuounitnoC.xaM
A8
SMR
A4
SMR
A01
SMR
SMRtsruB.xaM
A51
SMR
A8
SMR
A81
SMR
tsruBgniruDkaeP.xaM
A22
KAEP
A11
KAEP
A52
KAEP
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
additional30%abovetheminimumamperagetoprevent
peak voltage drops at the service entry.
TROUBLESHOOTING 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.
SafetyIssues
Pay close attention to these important electrical and
safety issues.
Use a power cord adapter to drive the 650-P
from a standard -prong outlet (NEMA 5-15R;
125V max).
earth
ground chassis
ground
The 650-P requires a grounded outlet. Always use
a grounding adapter when connecting to un-
grounded outlets.
Do not use a ground-lifting adapter or cut the AC
cable ground pin.
Keep all liquids away from the 650-P to avoid hazards
from electrical shock.
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.
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 out-
doors without weather protection! Contact Meyer Sound
for more information.

5
PowerConnectorWiringConventions
Use the following AC cable wiring diagram to create
international or special-purpose power connectors:
brown = hot
blue =
neutral
yellow/green =
earth ground
(chassis)
AC cable color code
If the colors referred to in the diagram don't correspond
to the terminals in your plug, use the following guide-
lines:
• Connect the blue wire to the terminal marked
with an N or colored black.
• Connect the brown wire to the terminal marked
with an Lor colored red.
• Connect the green and yellow wire to the terminal
marked with an E(or ) or colored green (or
green and yellow).
Audio Input
The 650-P presents a 10 kOhmbalanced input imped-
ance to a three-pin XLR connector wired with the fol-
lowing convention:
Pin 1 — 220 kOhm to chassis and earth ground (ESD
clamped)
Pin 2 — Signal
Pin 3 — Signal
Case — Earth (AC) ground and chassis
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 with XLR connectors for
balanced signal sources.
TROUBLESHOOTING NOTE: If abnormal noise (hum,
hiss, popping) is produced from the loudspeaker, dis-
connect 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.
A single source candrive multiple650-Ps with aparalleled
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 650-P is 10 kOhms, cascading 20
650-Ps produces a balanced input impedance of 500
Ohms. If a 150 Ohm source is used, the 500 Ohm load
results in a 2.28 dB loss.
Amplification and Protection
Circuitry
Each driver in the 650-P is powered by one channel
of the Meyer MP-2, a 1240 W amplifier (620 W/ch)
utilizing complementary power MOSFET output stages
(classAB/H). The following sections discuss the MP-2’s
limiting circuitry and the two-fan cooling system.
TruPower™LimitingSystem
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 speaker’s resistance changes in response to
the frequency content of the source material and ther-
mal variations in the speaker’s voice coil and magnet.
Conventionallimitersbeginlimitingprematurely,which
under-utilizessystemheadroomanddeprivesthespeaker
of its full dynamic range.
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 of the drivers by controlling
the temperature of the voice coil.
Differential Inputs

6
When the safe continuous power level is exceeded, a
singlelimiter engages, affecting both amplifier channels
equally. TPL activity is indicated by the Sub Limit LED
on the user panel. The limiter ceases operation when the
power level returns to normal and does not affect the
signal when the LED is inactive.
The 650-P performs within its acoustical specifications
and operates at a normal temperature if the TPL LED is
on for no longer than two seconds, and off for at least
one second. If the LED remains on for longer than three
seconds, the 650-P is hard limiting with these negative
consequences:
• Increasing the input level will not increase the
volume.
• The system distorts due to clipping and nonlin-
ear driver operation.
• The life-span of driver and amplifier components is
reduced because they are subjected to excessive
heat.
The TPL LED 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.
Driver Excursion Clamp
The drivers in the 650-Pareprotected fromover-excursion
by an excursion clamping circuit that does not have
attack or release time constants. The circuit provides
instantaneous braking for the drivers without the
pumping effects commonly produced by compressor/
limiters.
The circuit uses sophisticated filters to minimize the
distortion normally caused by clamping and clipping.
As the 650-P’s input signal is increased past the clamping
point, the output signal remains at a fixed level, protecting
the drivers and minimizing negative sonic effects. The
650-P operates safely if the Exc. Clamp LED is on for no
longer than two seconds, and off for at least one second.
Fans and Cooling System
The 650-P 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.
Afoam 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 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.
air
intake
cooling
fans
heatsinks
air filter
power
supply
A variable-speed primary fan runs continuously with
an inaudible operating noise of 22 dBA at 1 m at its
slowest speed. The speed of the primary fan begins
increasingwhenthetemperatureoftheheatsinksreaches
42°C. The fan reaches full speed at 62°C and is barely
audible near the cabinet, even without an audio signal.
In the unusual event that the heatsink temperature
reaches 74°C, the secondary fan turns on; it turns off
when the temperature decreases to 68°C. The second-
ary fan is audible at close proximity without an audio
signal and turns on in response to
• primary fan failure (check its status immediately);
• a prolonged period of high source levels in hot
temperatures or direct sunlight;
• 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 650-P automatically shuts down until AC
power is removed and reapplied. If the 650-P shuts down
again after cooling and reapplying AC power, contact
Meyer Sound for repair information.

7
Configuration, Placement,
and Polarity
Designing a full-range system requires an understanding
of how subwoofers respond when grouped together,
how they interact with nearby walls and floors, and how
their location in a system affects the choice of polarity to
use for other speakers. These topics are introduced as
background for the section Full-Range Systems.
Configuration
A single subwoofer has an essentially omnidirectional
coverage pattern. A horizontal line with two adjacent
subs narrows the horizontal coverage area, without
changing the vertical coverage, compared to one sub. A
vertical stack of two subs narrows the vertical coverage
withoutchanging the horizontal coverage. In both cases,
there is 3 to 6 dB SPL of on-axis addition.
Increasing the size of the horizontal or vertical array
from two to three subs further narrows the respective H
or V coverage without changing the corresponding V or
H coverage. Both the vertical and horizontal three-sub
arrays provide approximately 10 dB SPL addition more
than one sub.
Increasing the number of subs in the horizontal or verti-
cal array increases the corresponding H or V directional
control and the system SPL.Aproperly designed vertical
array steers low frequencies to include balconies and
upper tiers but avoids unnecessary interaction with the
ceiling; a horizontal array focuses low frequencies for
the longer throw distances required by large venues.
The three-by-two array (below left) narrows the H and
V coverages, and produces 10 to 15 dB SPL more than a
single sub. Combining the vertical and horizontal ar-
rays in an L-configuration (below right) provides more
on-axis SPL and directional control than the three-by-
two array.
Both the three-by-two group and L-configuration increase the
SPL and directional control.
Placement
One of the most important factors governing subwoofer
response is their placement relative to adjacent sur-
faces. Subwoofers gain significant power by coupling, or
loading, with nearby floors and walls. Half-space loading
describes a speaker coupling with one surface. Subs
placed on the floor benefit from half-space loading,
whileflown subs in free-space(withouta nearby wall or
ceiling) do not. In general, subs in half-space generate
twice the SPL (+6 dB) compared to the same number in
free-space.
It can be beneficial to fly subwoofers, despite the lack of
half-space loading. Placing subwoofers within a flown
cluster of mid-hi speakers creates a smooth frequency
image because the subs are not separated by the dis-
tance from the cluster to the floor.
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.
Polarity
The cabinets in the next section, Full-Range Systems,
are in a close-proximity coplanar orientation, unless
otherwise stated. Separating a mid-hi speaker from a
subwoofer by more than 5 ft may require setting the
speakers to opposite polarities to compensate for the
propagation delay from each speaker to the designated
listening or measurement position.
In a coplanar orientation, externally amplified Meyer
subwoofers require the opposite polarity setting to all
Meyer self-powered speakers.

8
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 SIM® System II
Sound Analyzer and CP-10 Parametric Equalizer to
• assist the process of choosing and configuring
speakers;
• measurepropagationdelaysbetweensubsystems
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 the Meyer LD-1A Line Driver to
integrate different types of Meyer self-powered speakers
into a complete system. The LD-1A has two channels
equipped to control a full-range main system, and 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:
• The Lo Cut switch activates a high-pass filter
(160 Hz, –12 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 opti-
mized for the DS-2P 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, the switch should be out,
which sends a full-range signal to both the DS-2
and Sub outputs.
• The DS-2 fand 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.
POLARITY NOTE: The polarity for Meyer self-powered
speakers 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 speakers con-
nected 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.
Full-Range Systems
MeyerSpeakerTypes
The following Meyer speakers are mentioned in the
example applications.
MSL-4 Self-powered mid-hi speaker
CQ Series Self-powered mid-hi speaker
MTS-4 Self-powered full-range speaker
PSW-2 Self-powered subwoofer
650-R2 Externally amplified subwoofer
The Meyer self-powered speakers listed above have a
loop connection to send the input signal to another
speaker. Full-range signals may be applied to all Meyer
self-powered subwoofers because they have built-in
active crossovers that filter mid-hi frequencies.
650-P and MSL-4
The 650-P is compatible with the MSL-4, CQ, and MTS-4.
However, since the low frequency response for each
speaker overlaps with the 650-P, the system frequency
response exhibits a rise in the range 65 – 100 Hz (MSL-
4), 40 – 100 Hz (CQ), and 30 – 100 Hz (MTS-4). It is
important to emphasize that the speakers are in phase in
this region. The rise can be corrected using the Meyer
CP-10 Parametric Equalizer, if desired.
MSL-4
loop
input
input
CP-10 EQ
(1 Channel)
650-P
Set the MSL-4 and 650-P to the same polarity.

9
LD-1A with 650-P and MSL-4
Using the LD-1A’s Lo Cut filter for the CH 1 Mid-Hi
output also eliminates the low frequency rise caused by
the frequency response overlap between the MSL-4 and
650-P. Although a typical MSL-4:650-Pratio is 2:1, CH 1’s
Sub and Mid-Hi level controls allow this ratio to vary
while maintaining control of the spectral balance of the
system. The DS-2 & Sub Crossover switch should be
out.
MSL-4
650-P
CH 1 Sub
CH1
Input
CH 1 Mid-Hi
LD-1A
Line Driver
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
Including subwoofers in a flown cluster provides a
smooth frequency image because the low and mid-hi
frequencies are produced from speakers located close
together. The identical dimensions of the PSW-2 and
MSL-4 allow them to be easily flown together.
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 inde-
pendent level control to each speaker.
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 subwoofers and flown cluster.
LD-1A with MSL-4, DS-2P, and 650-P
Adding the DS-2P to an MSL-4/650-P system enhances
LF power and clarity. With the DS-2 & Sub Crossover
switch in, the DS-2P and 650-P each receive signals
optimized for their frequency response capabilities.
The MSL-4 is driven from the CH 1 Mid-Hi output with
the Lo Cut filter into minimize the overlap in frequency
response with the DS-2P and 650-P. Set the 650-P to the
opposite polarity to the MSL-4 and DS-2P.
Set the 650-P to the opposite polarity to the DS-2P and
MSL-4.
650-P and 650-R2
Although it is preferable to employ the 650-P in a
completely self-powered system, the 650-P can be used
with the 650-R2 externally amplified subwoofer if:
• the B-2EX CEU is set to the maximum output
level;
• the 650-R2’s amplifier is set to 26 dB gain;
• the 650-R2’s amplifier is set to the opposite polarity
of the 650-P.
POLARITY NOTE: It is advisable to check the polarity of
adjacent 650-P and 650-R2 cabinets by following the
instructions in the Verifying Driver Polarity section on
page 10.

10
Dri er Troubleshooting
TroubleshootingwithTPL
The TPL LED can indicate serious driver problems, if
interpreted correctly. If one 650-P 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 650-P
down immediately.
The TPL circuit does not activate if there is no power
dissipation in the driver, regardless of the input signal
level. Therefore, if all 650-Ps 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.
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 TPL
LEDs. Contact Meyer Sound for more information about
RMS.
Driver Replacement
To determine whether a driver is 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).
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. How-
ever, 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 loud-
speakers.
NOTE: Since polarity reversal causes excessive driver
excursion at high source levels, use moderate levels for
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 monitoring microphone 3 ft from the front
of the loudspeaker at the midway point between
the two drivers.
2. Connect a signal source to the loudspeaker and
note the frequency response.
The polarity is correct if the frequency response is
±4 dB 28 – 100 Hz. Cancellation greater than 6 dB in
the same range indicates polarity reversal.
Polarity Between Adjacent Loudspeakers
Use the following test procedure to verify the polarity
between 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. Connectasignalsourcetoonespeakerandnotethe
frequency response and overall level.
4. Apply the same signal to the second speaker with
the first speaker still connected.
The polarity is correct if the frequency response remains
constantwith asignificantincreasein amplitude.Broad-
band cancellation (decreased overall level) indicates
polarity reversal.
NOTE: Do not attempt to check more than two adjacent
speakers in one test. Detecting polarity reversal among
more than two speakers is difficult and may damage
the drivers in the cabinet with reversed polarity.

11
• To reduce the risk of electric shock, disconnect the loud-
speaker from the AC mains before installing audio cable.
Reconnect the power cord only after making all signal
connections.
• Connecttheloudspeakertoatwo-pole,threewiregrounding
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 install the loudspeaker in wet or humid locations
withoutusingweatherprotectionequipmentfromMeyer
Sound.
• Do not allow water or any foreign object to get inside the
loudspeaker. Do not put objects containing liquid on, or
near, the unit.
• To reduce the risk of overheating the loudspeaker, avoid
exposing it to direct sunlight. Do not install the unit near
heat emitting appliances, such as a room heater or stove.
• Thisloudspeaker containspotentially 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.
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Safety Summary
• Um die Gefahr eines elektrischen Schlages auf ein Mini-
mum zu reduzieren, den Lautsprecher vom Stromnetz
trennen, bevor ggf. ein Audio-Schnittstellensignalkabel
angeschlossenwird.DasNetzkabelerstnachHerstellung
aller Signalverbindungen wieder einstecken.
• DerLautsprecheraneinegeerdetezweipoligeDreiphasen-
Netzsteckdoseanschließen.DieSteckdosemußmiteinem
geeigneten Abzweigschutz (Sicherung oder
Leistungsschalter) verbunden sein. Der Anschluß der
unterbrechungsfreienStromversorgunganeinenanderen
Steckdosentyp kann zu Stromschlägen führen und gegen
die örtlichen Vorschriften verstoßen.
• Der Lautsprecher nicht an einem Ort aufstellen, an dem
sie mit Wasser oder übermäßig hoher Luftfeuchtigkeit in
Berührung kommen könnte.
• Darauf achten, daß weder Wasser noch Fremdkörper in
das Innere den Lautsprecher eindringen. Keine Objekte,
die Flüssigkeit enthalten, auf oder neben die
unterbrechungsfreie Stromversorgung stellen.
• Umein ÜberhitzendemLautsprecher zuverhindern,das
Gerät vor direkter Sonneneinstrahlung fernhalten und
nicht in der Nähe von wärmeabstrahlenden
Haushaltsgeräten (z.B. Heizgerät oder Herd) aufstellen.
• Im Inneren diesem Lautsprecher herrschen potentiell
gefährliche Spannungen. Nicht versuchen, das Gerät zu
öffnen. Es enthält keine vom Benutzer reparierbaren
Teile. Reparaturen dürfen nur von ausgebildetem
Kundenienstpersonal durchgeführt werden.
• Pour réduire le risque d’électrocution, débrancher la
prise principale de l’haut-parleur, avant d’installer le
câble d’interface allant à l’audio. Ne rebrancher le bloc
d’alimentationqu’aprèsavoir effectuétouteslesconnections.
• Branchez l’haut-parleur dans une prise de courant à 3
dérivations (deux pôles et la terre). Cette prise doit être
munied’une protectionadéquate(fusible oucoupe-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.
• Nepasinstaller l’haut-parleurdansun endroit oùily ade
l’eau ou une humidité excessive.
• Ne pas laisser de l’eau ou tout objet pénétrer dans l’haut-
parleur. Ne pas placer de r´cipients contenant un liquide
sur cet appareil, ni à proximité de celui-ci.
• Pour éviter une surchauffe de l’haut-parleur, conserver-
laàl’abridusoleil.Nepasinstalleràproximitéd’appareils
dégageant de la chaleur tels que radiateurs ou appareils
de chauffage.
• Ce haut-parleur contient des circuits haute tension
présentant un danger. Ne jamais essayer de le démonter.
Il n’y a aucun composant qui puisse être réparé par
l’utilisateur.Touteslesréparationsdoiventêtreeffectuées
par du personnel qualifié et agréé par le constructeur.
• Parareducir elriesgode descargaeléctrica, desconectede
la red el altoparlante 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 altoparlante a un tomacorriente bipolar y
trifilar con neutro de puesta a tierra. El tomacorriente
debe estar conectado a la protección de derivación
apropiada(ya seaun fusible o un disyuntor).La conexión
a cualquier otro tipo de tomacorriente puede constituir
peligrodedescargaeléctricayviolarloscódigoseléctricos
locales.
• No instale el altoparlante en lugares donde haya agua o
humedad excesiva.
• Nodejeque enelaltoparlante entre aguaniningún objeto
extraño. No ponga objetos con líquidos encima de la
unidad ni cerca de ella.
• Para reducir el riesgo de sobrecalentamiento, no exponga
la unidad a los rayos directos del sol ni la instale cerca de
artefactos que emiten calor, como estufas o cocinas.
• Estealtoparlante contienenivelesde voltajepeligrososen
potencia.Nointentedesarmarlaunidad,puesnocontiene
piezas que puedan ser repardas por el usuario. Las
reparaciones deben efectuarse únicamente por parte del
personal de mantenimiento capacitado en la fábrica.

12
Complementary power MOSFET output stages class AB/H
1240 Watts (620 Watts per channel)
< .02 %
Acoustical1
±4 dB 28  100Hz
±30° 45  145Hz
136 dB peak
120 dB continuous; 130 dB peak
> 110 dB
Specifications
Frequency Response
hase Response
Maximum S L
Music as source
ink noise as source
Dynamic Range2
Transducers
Sub Frequency
Type
Connector
Nominal Input Level
Amplifiers
Type
Burst Capability3
THD, IM, TIM
AC Power
Connector
Automatic voltage selection4
Max Continuous RMS Current (> 10s)
Max Burst RMS Current (< 1s)
Max eak Current During Burst
Soft-Current Turn-on
Physical
Dimensions
Weight
Enclosure
Finish
rotective Grill
10kOhm impedance, electronically balanced
XLR (A-3) male and female
+4 dBu (1.23Vrms)
Two 18" diameter MS-18 cone drivers
250V NEMA L6-20 / IEC 309 Twistlock male receptacle
85  134V / 165  264V; 50Hz / 60Hz
115V: 8A 230V: 4A 100V: 10A
115V: 15A 230V: 8A 100V: 18A
115V: 22Apk 230V: 11Apk 100V: 25Apk
Inrush current < 12A @115V
30" W x 45" H x 22.5" D
221 lb (100 kg); shipping: 250 lb (113 kg)
All birch plywood
Black textured
erforated metal grill, fiberglass screen
Notes
1. Subject to half-space loading; measured
with one-third octave frequency resolu-
tion in fixed IS bands at 1 m.
2. Measured as the ratio between the peak
SPL and the A-weighted noise floor.
3. Nominal 8 ý resistive load, pink noise,
100V peak.
4. The unit is rated at 88125V and 182
235V, 50/60Hz, to satisfy EC standards
for 10% to 6% AC line voltage.
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Maximum on-axis SPL measured at 1 m using a sinewave signal
source, 1/3 octave intervals, half-space loading, < 10 THD.
Audio Input

13
Controls and Connectors
Rear User Panel shown with the optional
Remote Monitoring System (RMS) panel
European User Panel with
IEC 09 connector

14
Dimensions
Front Side
Top
All units in inches

15
Notes

16
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, California 94702
Telephone: 510 - 486 - 1166
FAX: 510 - 486 - 8356
E-mail: [email protected]
http://www.meyersound.com
Meyer Sound Germany
GmbH
Carl Zeiss Strasse 13
56751 Polch, Germany
Telephone: [phone]
FAX: [phone]
E-mail: [email protected]
Contact Information