Meyer Sound DS-2P User manual

Operating Instructions
DS-2P
Patents Pending
Self-Powered Mid-bass Speaker
Copyright © 1997, Meyer Sound Laboratories, Inc.
All rights reserved
Part #: 05.035.005.01 Rev B

2
According to ISO/IEC Guide and EN 45014
The product herewith complies with the require-
ments of the Low Voltage Directive 73/23/EEC and
the EMC Directive 89/336/EEC.
declares that the product:The Manufacturer:
Product Name:DS-2P
Product Options:All
Name:Meyer Sound Laboratories
Address:2832 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,
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
Made by Meyer Sound, Berkeley, CA, USA
European Office:
Meyer Sound Germany
GmbH
Carl Zeiss Strasse 13
56751 Polch, Germany
UULL
CC
UULL
®®
LISTED
3K59
COMMERCIAL
AUDIO SYSTEM
Meyer Sound Germany
Gmbh
Carl Zeiss Strasse 13
56751 Polch, Germany
Telephone: [phone]
FAX: [phone]
Declaration of Conformity
Contact Information
Office of Quality Manager
Berkeley, California USA
October 1, 1995
1.0 kV Power Lines
Shock: 30 g 11 msec half-sine
on each of 6 sides
Vibration: 10 – 55 Hz (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
!
Pour indiquer les risques
résultant de tensions
dangereuses
Zu die gefahren von
gefährliche spanning zeigen
Important operating
instructions
Pour indequer important
instructions
Frame or chassis
Masse, châssis
Rahmen oder chassis
Protective earth ground
Terre de protection
Die schutzerde
Para indicar azares provengo
de peligroso voltajes
Para 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

3
Contents
Controls and Connectors
European User Panel with
IEC 309 connector
Dimensions
Front Side Top
All units in inches
UULL
CC
UULL
®®
LISTED
3K59
COMMERCIAL
AUDIO SYSTEM
ATENCIÓN : ACCESO INTERNO
A PERSONAL TÉCNICO CALIFICA
ACHTUNG : GEHÄUSE NICH
WARTUNG UND REPARATUR
ELEKTROFACHKRÄFTE
ATTENTION : ENTRETIEN E
INTERNES NE SONT AUTORISEE
TECHNIQUE QUALIFIÉ
UK WARNING : THIS APPARAT
NO OPERATOR SERVICEABLE PART
SERVICING TO QUALIFIED PERSONN
WARNINGS:
This surface may reach high tempera
To ensure proper operation, allow a
clearance from this surface and adeq
To reduce the risk of electric shoc
No operator serviceable parts insid
qualified personnel.
To reduce the risk of fire or electric
this appliance to rain or moisture.
P
U
S
H
R
E
-
C
I
R
K
-
I
T
Earth / Chassis
Earth / Chassis
Input Loop
Pin
2 +
3 +
!
1
12
3
1
3
2
8A RMS
20A Peak
95-125
~
50-60Hz
700W RMS MAX
Meyer Sound,
Auto-Voltage Sele
Input Polarity
THIS PRODUCT MUST BE GROUNDED
P
U
S
H
R
E
-
C
I
R
K
-
I
T
PUSH
Made by:Meyer Sound,Berkeley,Ca. U.S.A.
European Office:
Meyer Sound Europe
14, Long Barn Lane,
Reading, Berkshire,
England RG2 7SZ
Controls and Connectors .................................. 3
Dimensions ........................................................ 3
Introduction ....................................................... 4
AC Power ........................................................... 4
Audio Input ........................................................ 6
Amplification and Protection Circuitry ............ 6
Rigging ............................................................... 8
Measurement and System Integration Tools .......8
Complete Systems ..................................................9
Driver Troubleshooting.........................................10
Array Design ..........................................................12
Safety Summary....................................................13
Specifications ........................................................14
ATENCIÓN : ACCESO INTERNO SOLO
AUTORIZADO A PERSONAL TÉCNICO CALIFICADO
ACHTUNG : GEHÄUSE NICHT ÖFFNEN WARTUNG
UND REPARATUR NUR DURCH ELEKTROFACHKRÄFTE
ATTENTION : ENTRETIEN ET REPARATIONS
INTERNES NE SONT AUTORISEES QU'AU
PERSONNEL TECHNIQUE QUALIFIÉ
UK WARNING : THIS APPARATUS MUST BE EARTHED.
NO OPERATOR SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED PERSONNEL
WARNINGS:
THIS PRODUCT MUST BE GROUNDED
This surface may reach high temperatures while in use.
To ensure proper operation, allow at least 6 inches
clearance from this surface and adequate ventilation.
To reduce the risk of electric shock do not remove cover.
No operator serviceable parts inside.
Refer servicing to qualified personnel.
To reduce the risk of fire or electric shock
do not expose this appliance to rain or moisture.
!
Meyer Sound, Berkeley, CA. USA
12
3
1
3
2
Loop
Input
PUSH
Active / Speaker Fault
2 +
3 +
10K Ω
Balanced
Input Polarity
Network
Service Wink Reset Activity
Remote Monitoring System
Earth / Chassis
1
Case
220K Ω
ESD
P
U
S
H
R
E
-
C
I
R
K
-
I
T
P
U
S
H
R
E
-
C
I
R
K
-
I
T
Mains circuit
breakers
Signal input and
loop connectors
Power LED (green/red)
Input polarity switch
Tie-wrap anch
o
Mains AC inlet
Remote Monitoring
System panel
(if RMS is installed)
LO Limit
Driver Excursion Clamp
Low Limit (red)
Exc. Clamp
DS-2P
95-125V ~
50-60Hz
1400W RMS MAX
208-235V ~
50-60Hz
1400W RMS MAX
Auto-Voltage Select
Rear User Panel shown with the optional
Remote Monitoring System (RMS) panel
56.75
14.25
28.75
5.50
30.00
21.25
7.5°
30.26
13.16
21.97
30.00
13.36

4
Introduction
The Meyer DS-2P self-poweredmid-bassloudspeaker
isintendedtosupplementMeyer self-poweredsubwoofers
but can also be used as a stand-alone subwoofer. When
used with a Meyer subwoofer and crossover (such as
the Meyer LD-1ALine Driver), frequencies below 80 Hz
are sent to the subwoofer, and the mid-bass frequencies
are sent to the DS-2P, allowing each speaker to function
in its most efficient range. See page 8 for an overview of
the LD-1A; contact Meyer Sound for additional infor-
mation.
The DS-2P contains independent amplifier and control
electronics for two 15” cone drivers in a compact folded
hornenclosure.Thisintegrateddesignimprovesperfor-
mance, durability, and reliability, eliminates amplifier
racks, and simplifies setup and installation.
The minimum configuration of two DS-2Ps have the
following acoustical specifications:
Frequency Response ±4 dB 50 – 160 Hz
Phase Response ±60°60 – 200 Hz ¿¿
Dynamic Range > 120 dB
Coverage 120°H x 120°V
The DS-2P’s trapezoidal shape facilitates the creation of
speakerarraysthatmaximizethecoverageareaandSPL
forthesizeofthearray.Rigginghardwareisprovidedto
safely suspend the DS-2P in elevated installations.
The DS-2P can be equipped to operate with the Remote
Monitoring System (RMS) interface network and
software application. RMS displays signal and power
levels,driverandcooling fan status,limiteractivity,and
amplifiertemperatureforallspeakersin thenetworkon
a Windows-based PC.
AC Power
WhenAC power is applied to the DS-2P, the Intelligent
AC™ supply automatically selects the correct operating
voltage,allowing the DS-2Pto beused in the US, Europe,
orJapan without manually setting avoltage 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 DS-2P
uses a NEMA L6-20P or IEC 309 male power inlet and
satisfies UL, CSA, and EC safety standards.
Voltage Requirements
The DS-2P operates safely and without audio discon-
tinuity if the AC voltage stays within the ranges 85–
134 V or 165–264 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.
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 DS-2P
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 tapselectionis instantaneousand thereare
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.
IftheDS-2Pshutsdownduetoeitherloworhighvoltage,
the power supply automatically turns on after three
seconds if the voltage has returned to either normal
operatingrange. If the DS-2P does not turnback on after
tenseconds,removeACpowerandrefertothe TROUBLE-
SHOOTING NOTE above.

5
Current Requirements
The DS-2P presents a dynamic load to the AC mains
whichcausestheamountofcurrenttofluctuatebetween
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 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.
ThemaximumburstRMScurrentis themaximum 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
Usethe table belowas a guide to selectcables and circuit
breakerswithappropriateratingsforyouroperatingvolt-
age.
sgnitaRtnerruCP2-SD
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
additional 30% above the minimum amperage to prevent
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.
Safety Issues
Pay close attention to these important electrical and
safety issues.
Use a power cord adapter to drive the DS-2P
from a standard 3-prong outlet (NEMA 5-15R;
125 V max).
earth
ground
chassis
ground
The DS-2P requires a grounded outlet. Always
use a grounding adapter when connecting to
ungrounded outlets.
Do not use a ground-lifting adapter or cut the AC
cable ground pin.
Keep all liquids away from the DS-2P 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.

6
Power Connector Wiring Conventions
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
Ifthecolorsreferredtointhediagramdon'tcorrespondto
theterminals inyour plug, usethe followingguidelines:
• 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 DS-2P presents a 10 kΩbalanced input impedance
to a three-pin XLR connector wired with the following
convention:
Pin 1 — 220 kΩto 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
pressurewave when apositive signal isapplied 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, discon-
nect 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.
AsinglesourcecandrivemultipleDS-2Pswithaparalleled
input loop, creating an unbuffered hardwired loop
connection.Make certainthatthe sourceequipment can
drivethe totalload impedance presentedby the paralleled
input circuit. For example, since the input impedance of
a single DS-2P is 10 kΩ, cascading 20 DS-2Ps produces a
balanced input impedance of 500 Ω. If a 150 Ωsource is
used, the 500 Ωload results in a 2.28 dB loss.
Amplification and Protection
Circuitry
Each driver in the DS-2P 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™ Limiting System
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
thefrequencycontentofthesourcematerialandthermal
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
speakerimpedanceby measuringcurrent,inaddition to
voltage,to computethepower dissipationand voicecoil
temperature. TPL improves performance before and
during limiting by allowing the speaker to produce its
maximum SPL across its entire frequency range. TPL
alsoextends thelifetime ofthe driversby controllingthe
temperature of the voice coil.
When the safe continuous power level is exceeded, a
singlelimiter engages, affectingboth 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.
Differential Inputs

7
The DS-2P 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 DS-2P is hard limiting with these negative
consequences:
• Increasing the input level will not increase the
volume.
• Thesystemdistortsdueto clippingand nonlinear
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 DS-2P are protected from over-
excursion by an excursion clamping circuit that does
not have attack or release time constants. The circuit
providesinstantaneous brakingfor the driverswithout
the pumping effects commonly produced by compressor/
limiters.
The circuit uses sophisticated filters to minimize the
distortion normally caused by clamping and clipping.
AstheDS-2P’sinput signal isincreasedpastthe clamp-
ing point, the output signal remains at a fixed level,
protecting the drivers and minimizing negative sonic
effects. The DS-2Poperates safely if the Exc. ClampLED
is on for no longer than two seconds, and off for at least
one second.
Fans and Cooling System
The DS-2P 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.
heatsinks
power
supply
air
intake
air
intake
cooling fans
Avariable-speedprimaryfanrunscontinuouslywithan
inaudible operating noise of 22 dBA at 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.
Intheunusualeventthattheheatsinktemperaturereaches
74°C, the secondary fan turns on; it turns off when the
temperature decreases to 68°C. The secondary fan is
audible at close proximity without an audio signal and
turns 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;
• driver failure.
TROUBLESHOOTING NOTE: In the highly unlikely event
that the secondary fan does not keep the temperature
below 85 ° C, the DS-2P automatically shuts down until
AC power is removed and reapplied. If the DS-2P shuts
down again after cooling and reapplying AC power,
contact Meyer Sound for repair information.

8
Rigging
TheDS-2P weighs221 lb (100kg). The maximumrecom-
mendedload fora singlecabinet withaircraftpan fittings
is600lb(273kg).This workingloadisbasedona 5:1safety
factor. The DS-2P has six rigging brackets (three on top
and bottom). Each bracket is capable of supporting the
full working load of the cabinet.
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.
rigging brackets
three on top, three on bottom
Handles are for carrying only.
Do not use them for rigging!
!
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 significantly. Load ratings can also be
reduced by age, wear, and damage. It is important to
inspecttherigginghardwareregularlyandreplaceworn
or damaged components immediately.
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
shieldcablesandelectronics.Donotinstalla unit outdoors
withoutweatherprotection!ContactMeyerSoundformore
information.
NOTE: All Meyer Sound products must be used in accor-
dance with local, state, federal, and industry regulations.
It is the owner’s and/or user’s responsibility to evaluate
the reliability of any rigging method for their application.
Rigging should be done only by experienced professionals.
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.
• TheDS-2&SubCrossoverswitch(channels 1and
2 only) activates a crossover network optimized
for the DS-2P when used with the PSW-2 or 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 subwoofer is
used without the DS-2P, (or the DS-2P is used
alone as a subwoofer) the switch should be out,
which sends a full-range signal to both the DS-2
and Sub outputs.
• The DS-2 φand Sub φ 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 φ and Sub φ switches for speakers
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.

9
Complete Systems
The following Meyer speakers are mentioned in the
example applications.
MSL-4, CQ Self-powered mid-hi speaker
650-P Self-powered subwoofer
DS-2 Externallyamplifiedmid-bassspeaker
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.
LD-1A with MSL-4, DS-2P, and 650-P
Although the DS-2P can be used as a stand-alone sub-
woofer, it is most effectively employed with the 650-P to
enhance low frequency (LF) power and clarity. The LD-1A
isaneffectivetooltocontrolthisconfigurationcontaining
three subsystems and two crossover points.
With the DS-2 & Sub Crossover switch in, the DS-2 and
Sub outputs each receive signals optimized for the
frequency response capabilities of the DS-2P and 650-P.
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.
MSL-4
DS-2P
CH 1 DS-2
650-P
CH 1 Sub
CH 1 Mid-Hi
Input CH 1 LD-1A
Line Driver
Set the 650-P to the opposite polarity to the DS-2P and
MSL-4.
LD-1A with MSL-4, DS-2P, CQ, and
650-P
This example shows the LD-1A integrating a complete
system of self-powered speakers for a large venue.
Although the diagram shows half of the system with
channels1,3, and 5,channels2, 4, and6can be usedwith
identical connections for the other half. The MSL-4, DS-2P,
and CQ arrays are flown; the 650-Ps are on the floor.
TheCH1Mid-Hi and CH3outputsdrivethe innerthree
and outer two speakers of the MSL-4 array, applying
appropriate levels for speakers directed at different
distances. The diagram shows the additional mid-hi
output created by connecting the CH 1 Loop to the CH 3
input.UsingaY-connectionattheCH1input(as shownfor
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/650-P systems. The Array EQ filters
minimize the MSL-4 array’s low-mid rise.
The CH 1 DS-2 and Sub outputs drive the DS-2P and
650-P systems with the DS-2 & Sub Crossover switch in.
Set the MSL-4 and DS-2P to the same polarity. The
polarity of the650-P depends on the height and distance
of the measurement position from the subwoofer and
flown systems.
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 coverage area. To insure that the
speakers combine properly in the intersecting coverage
area:
• 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.
• 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 systems.
• Delaythedown-fillto compensate forthepropa-
gation delay between the down-fill and main
systems in the intersecting coverage area.

10
We recommend that the entire system be measured,
phase-aligned, and equalized using the SIM System II
Sound Analyzer and CP-10 Parametric Equalizer.
650-P Subwoofers
CQ Down-fills
DS-2P Mid-Bass
MSL-4 Mid-Hi
Input Mid-Hi
Output
DS-2
Output
Loop
Sub
Output
Input Output
LD-1A
Delay
CP-10 EQ
CP-10 EQ
CH 1
CH 3
Input Output
CH 5
Set the CQ to the opposite polarity to the MSL-4 and DS-2P.
The polarity of the 650-P depends on the height and
distance of the measurement position from the the flown
and subwoofer systems.
DS-2P and DS-2
Although it is preferable to employ the DS-2P in a
completelyself-poweredsystem, the DS-2P can be used
with the DS-2 externally amplified mid-bass speaker if:
• the D-2 CEU is set to the maximum output level;
• the DS-2 amplifier is set to 26 dB gain;
• the DS-2P is set to the same polarity as the DS-2
amplifier.
26 dB gainlevel control
at maximum
CP-10 EQ
D-2
CEU Amplifier DS-2
DS-2P
Set the DS-2P and the DS-2 amplifier to the same polarity.
Driver Troubleshooting
Troubleshooting with TPL
The TPL LED can indicate serious driver problems, if
interpreted correctly. If one DS-2P 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 DS-2P
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 DS-2Ps 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.
We do not recommend using phase poppers to analyze
driverpolarity.Thephaseresponseforalldriversvaries,
to some degree, over the frequency range in which it
operates. Since the phase popper, a popular but inaccurate
tool, does not discern 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.

11
Phase poppers are, therefore, not useful for performing
phase measurements on an individual loudspeaker or a
full-range sound system containing one or more cross-
overs. If necessary, apply a phase popper only to loud-
speakers with identical drivers without a crossover, and
check the system’s overall phase response with a
frequency analyzer and/or listening test.
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 measurement 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.
Drivers with correct
polarity cause acoustic
addition
Drivers with reverse
polarity cause acoustic
cancellation
Top driver is 180 ° out of phase
The polarity is correct if the frequency response is ±4 dB
50–160 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
constantwithasignificantincreaseinamplitude.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.

12
Array Design
Array Design for Low Frequencies
Although the DS-2Pis a called a mid-bass speaker,it still
functionsin the frequencyrealmof asubwoofer, especially
when used as a stand-alone subwoofer without the 650-P
or PSW-2. Subwoofer and mid-hi speaker array design
differ because frequencies below 125 Hz are mostly
omnidirectional;directionalityincreaseswithfrequency.
However, when several subwoofers are arrayed, the
low frequencies can be focused. This section introduces
some of the fundamental concepts for designing sub-
woofer arrays.
The coverage patterns of two DS-2Ps in a horizontal
array interfere with each other such that the horizontal
coveragenarrows,withoutaffectingtheverticalcoverage.
A vertical array of two DS-2Ps narrows the vertical,
without affecting the horizontal coverage. Due to the
larger distance between drivers in vertical arrays, the
vertical coverage narrows at a more significant rate than
does the horizontal coverage for horizontal arrays,
given the same array size.
Increasing the number of horizontal or vertical DS-2Ps
in the array increases the corresponding Hor V LF
directionalcontrol.Aproperlydesignedverticalarraysteers
low frequencies to include balconies and upper tiers,
while a horizontal array focuses low frequencies for
long throw distances without interacting with the walls.
OneofthemostimportantfactorsgoverningLF responseis
speakerplacementrelativetoadjacentsurfaces. TheDS-2P
gains significant LF power by coupling with nearby
floorsandwalls.Half-spaceloading describesaspeaker
coupling with one surface. Speakers placed on the floor
benefitfromhalf-spaceloading, while flownspeakersin
free-space (without a nearby wall or ceiling) do not. In
general, subwoofers in half-space generate twice the
SPL(+6dB) comparedto thesame numberinfree-space.
NOTE: The trapezoidal shape of the DS-2P does not
represent the horizontal coverage area of the speaker.
DS-2P Coverage and Maximum SPL
A series of outdoor tests was conducted at Meyer Sound
to determine the coverage angle and on-axis SPL for
arrays with one row with up to six speakers. The mea-
surementswereconductedatadistanceof8mwithhalf-
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 60 to 160 Hz.
Since the DS-2P’s horizontal coverage angle is wide
(140°), splay angles larger than 15°are not often used.
The 15°angle is optimal since it combines substantial
SPLaddition with a narrowing of the horizontal coverage.
The 15°angle also corresponds to tight-packing DS-2Ps
together along the edges of the enclosure, making array
construction particularly convenient, especially for
rigging clusters.
The following table shows the SPL and coverage areas
for horizontal arrays with up to 6 DS-2Ps. The splay
angle refers to the angle between cabinet centers.
If this information does not address your application
requirements,contact MeyerSound toobtain additional
information on array design.
1 2 @ 15°3 @ 15°4 @ 15°5 @ 15°6 @ 15°
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
140 120 141 120 120 148 110 120 150 100°120 149 90 120 153 80 120 154
DS-2P Horizontal Array Coverage and Maximum SPL

13
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Safety Summary
!
• 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,threewireground-
ing 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 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.
• Um die Gefahr eines elektrischen Schlages auf ein Minimum
zureduzieren,denLautsprechervomStromnetztrennen,
bevor ggf. ein Audio-Schnittstellensignalkabel
angeschlossenwird.DasNetzkabel erstnachHerstellung
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 Überhitzen dem Lautsprecherzuverhindern, 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.EsenthältkeinevomBenutzerreparierbarenTeile.
Reparaturen dürfen nur von ausgebildetem
Kundenienstpersonal durchgeführt werden.
• Parareducir el riesgodedescarga eléctrica, desconectede
la red el altoparlante antes de instalar el cable de
señalizacióndeinterfazdelasegnale.Vuelvaaconectarel
conductor flexible de alimentación solamente una vez
efectuadas todas las interconexiones de señalizatción.
• Conecteelaltoparlanteauntomacorrientebipolarytrifilar
con neutro de puesta a tierra. El tomacorriente debe estar
conectadoala protecciónde derivaciónapropiada(yasea
un fusible o un disyuntor). La conexión a cualquier otro
tipodetomacorrientepuedeconstituirpeligrodedescarga
eléctrica y violar los códigos eléctricos locales.
• No instale el altoparlante en lugares donde haya agua o
humedad excesiva.
• Nodeje queen el altoparlanteentre 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.
• Pourréduirelerisqued’électrocution,débranchezlaprise
principale de l’haut-parleur, avant d’installer le câble
d’interface allant à l’audio. Ne rebranchez le bloc
d’alimentation qu’après avoir effectué toutes les connections.
• Branchez l’haut-parleur dans une prise de courant à 3
dérivations (deux pôles et la terre). Cette prise doit être
munie d’une protection adéquate (fusible ou coupe-circuit).
Le branchement dans tout autre genre de prise pourrait
entraîner un risque d’électrocution et peut constituer une
infractionà laréglementation locale concernantles instal-
lations électriques.
• Nepas installerl’haut-parleur dans unendroit 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, conservez-la
à l’abri du soleil. Ne pas installer à proximité d’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.

14
Complementary power MOSFET output stages class AB/H
1240 Watts (620 Watts per channel)
< .02 %
Acoustical1
±4 dB 50 – 160 Hz
±60°60 – 200 Hz
140 peak
136 dB continuous; 140 peak ¿¿check
> 120 dB
120°H x 120°V
Specifications
Frequency Response2
Phase Response2
Maximum SPL
Music as source
Pink noise as source
Dynamic Range3
Coverage
Transducers
Low Frequency
Audio Input
Type
Connector
Nominal Input Level
Amplifiers
Type
Burst Capability4
THD, IM, TIM
AC Power
Connector
Automatic voltage selection5
Max Continuous RMS Current (> 10s)
Max Burst RMS Current (< 1s)
Max Peak Current During Burst
Soft-Current Turn-on
Physical
Dimensions
Weight
Enclosure/Finish
Protective Grill
Rigging
10 kΩimpedance, electronically balanced
XLR (A-3) male and female
+4 dBu (1.23 Vrms)
Two 15" diameter MS-15 cone
250 V NEMA L6-20P / IEC 309 Twistlock male receptacle
85 – 134 V / 165 – 264 V; 50 Hz / 60 Hz
115 V: 8 A 230 V: 4 A 100 V: 10 A
115 V: 15 A 230 V: 8 A 100 V: 18 A
115 V: 22 Apk 230 V: 11 Apk 100 V: 25 Apk
Inrush current < 12A @115V
21.25” W x 56.75” H x 30” D
221 lb (100 kg); shipping: 267 lb (121 kg)
Multi-ply hardwood/black textured
Perforated steel grill, grey foam
Six aircraft pan fittings (three on top and bottom).
Working load for each fitting is 600 lb, based on a
5:1 safety factor, with a straight tensile pull.
Notes
1. Acoustical specifications are for the minimum
configuration of two DS-2P cabinets and are
measured at 2 m on-axis from the 1/R image
(located at the rear of the cabinet).
2. Subject to half-space loading; measured
with one-third octave frequency resolution in
fixed ISO bands.
3. Measured as the ratio between the peak SPL
and the A-weighted noise floor.
4. Nominal 8 Ω resistive load, pink noise, 100 V
peak.
5. The unit is rated at 88–125 V and 182–235 V,
50/60 Hz, to satisfy EC standards for –10% to
6% AC line voltage.