Meyer Sound CQ-2 User Manual

™

CQ Series

Operating Instructions

Self-Powered Loudspeaker

Patents Pending

Features

• Wide and narrow overage patterns
for CQ-1 (low Q) and CQ-2 (high Q)

• Self-contained control electronics,
amplifiers, and drivers

• Dual-channel 1240 Watt amplifier
(620 Watts per channel)

• Active balanced input circuit

• Active crossover with optimized
pole-zero filter combinations

• Intelligent AC™ System

• TruPower™ Limiting (TPL)

• Compatible with the Remote
Monitoring System™ (RMS)

The CQ™ Series self-powered loudspeakers contain
independent amplifier and control electronics for one
15” bass-reflex cone driver and one 4” diaphragm horn
driver in a compact enclosure. This integrated design
eliminates amplifier racks, simplifies setup and
installation, and improves durability and reliability.

The CQ Series, consisting of the CQ-1 (low Q) and
CQ-2 (high Q), are efficient full-range speakers and
ideal companions for the PSW-2, PSW-4, and 650-P
self-powered subwoofers. The CQ Series have the
following acoustical specifications:

Frequency Response ±4 dB 40 Hz – 18 kHz
Phase Response ±90° 50 Hz – 16 kHz
Max Peak SPL at 1 m CQ-1: 136 dB; CQ-2: 139 dB
Dynamic Range > 110 dB

The CQ is phase-corrected through the crossover, which
yields exceptional system impulse response and
accurate signal reproduction.

The beam width of a horn is the angle at which the
sound pressure at a given frequency decreases to half
(–6 dB) its on-axis value. Most horns have a beam width
that varies with respect to frequency, nonuniform
frequency response within their coverage area, and
significant side lobes outside their beam width. These
undesirable characteristics are easily identified by
viewing polar patterns plotted at various frequencies.

Meyer Sound developed the CQ Series horns in an
anechoic chamber by measuring coverage patterns
using angular and frequency resolutions of 1° and

1

⁄24 octave, respectively. The CQ Series horns exhibit

Constant Q: the beam width remains consistent across
the horn’s operating frequency range in both the vertical
and horizontal planes. The CQ-1 has a wider horizontal
beam width than the CQ-2. The CQ Series have the
same vertical beam width and share the following
remarkable attributes:

• uniform frequency response within the beam width

• rapid and uniform amplitude attenuation for all
frequencies outside the beam width

• minimal side lobes

The CQ horns are an unprecedented development in
acoustical measurement, design, and manufacturing.
The CQ Series loudspeakers are ideally suited for venues
requiring precise coverage with minimal interaction
between subsystems but are appropriate for any
acoustical environment.

The CQ can be equipped to operate with the Remote
Monitoring System™ (RMS) interface network and
software application. RMS displays signal and power
levels, driver and cooling fan status, limiter activity, and
amplifier temperature for all speakers in the network on
a Windows-based PC.

Symbols Used

These symbols indicate important safety or operating features in this booklet and on the chassis.

!

Dangerous voltages:
risk of electric shock

Pour indiquer les risques

résultant de tensions

dangereuses

Zu die gefahren von

gefährliche spanning zeigen

Para indicar azares provengo

de peligroso voltajes

Important operating

instructions

Pour indequer important

instructions

Zu wichtige betriebs-

anweisung und unter-

haltsanweisung zeigen

Para indicar importante

funcionar y mantenimiento

instrucciones

Declaration of Conformity

According to ISO/IEC Guide and EN 45014

Name: Meyer Sound Laboratories
Address: 2832 San Pablo Avenue

Berkeley, California 94702-2204, USA

conforms to the following Product Specifications:

Frame or chassis

Masse, châssis

Rahmen oder chassis

Armadura o chassis Tierra proteccionista

Protective earth ground

Terre de protection

Die schutzerde

declares that the product:The Manufacturer:

Product Name: CQ-1, CQ-2
Product Options: All

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,

The product herewith complies with the require­ments of the Low Voltage Directive 73/23/EEC and
the EMC Directive 89/336/EEC.

1.0 kV Power Lines

Office of Quality Manager

Berkeley, California USA

October 1, 1996

Made by Meyer Sound, Berkeley, CA, USA

European Office:

Meyer Sound Germany
GmbH
Carl Zeiss Strasse 13
56751 Polch, Germany

Contact Information

Meyer Sound Laboratories, Inc.

2832 San Pablo Avenue
Berkeley, California 94702
Telephone:510 - 486 - 1166
FAX: 510 - 486 - 8356
E-mail: [e-mail]
http://www.meyersound.com

Environmental Specifications for

Meyer Sound Electronics Products

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)

Shock: 30 g 11 msec half-sine

on each of 6 sides

Vibration: 10 – 55 Hz (0.010 m

peak-to-peak excursion)

LISTED

UU

LL

®®

3K59

COMMERCIAL

AUDIO SYSTEM

Meyer Sound Germany
Gmbh

Carl Zeiss Strasse 13
56751 Polch, Germany
Telephone: [phone]
FAX: [phone]

UU

LL

CC

2

Contents

R

T

H

E
U

A

P
E

w
a

o

s
o
t
r

e

e
u
u

c

15.25"

13.55"

21.0"

20.5"

2.0"

9.55"

Controls and Connectors .................................. 3

Dimensions ........................................................ 3

AC Power ........................................................... 4

Audio Input ........................................................ 5

Limiting and Protection Circuitry ..................... 6

Rigging ............................................................... 7

Controls and Connectors

Mains circuit
breakers

S

H

U

P

R

T

E

I

-

-

C

K

I

R

S

H

U

P

R

T

E

I

-

-

C

K

I

R

PUSH

2

1

2

1

3

3

Input

Loop

Service

Remote Monitoring System

Network

Wink

Reset

Activity

High Limit (red)

Low Limit (red)

Power LED (green/red)

Input polarity switch

Signal input and

loop connectors

Remote Monitoring
System panel
(if RMS is installed)

10K

Balanced

Ω

ESD

Earth / Chassis

CQ

HI Limit

LO Limit

Active / Speaker Fault
Input Polarity

2 +
3 +

1
220K

Ω

Case

Complete Systems .............................................. 8

Verifying Polarity ............................................... 10

Coverage Angles and Polar Plots..................... 11

Array Design ......................................................14

Safety Summary................................................ 15

Specifications .................................................... 16

!

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.

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

Auto-Voltage Select
95-125V

~

208-235V
50-60Hz
1400W RMS MAX

Meyer Sound, Berkeley, CA. USA

~

50-60Hz

1400W RMS MAX

Mains AC inlet

Tie-wrap anchor

2

S

H

U

P

R

T

E

I

-

-

C

K

I

R

S

H

U

P

R

T

E

I

-

-

C

K

I

R

PUSH

2

1

1

3

3

Service

Wink

Reset

Input

Loop

Activity

Remote Monitor System

Network

!

WARNINGS:
THIS PRODUCT M

This surface may reach high t
To ensure proper operation, allo
clearance from this surface and
To reduce the risk of electric sh
No operator serviceable parts in
Refer servicing to qualified pers
To reduce the risk of fire or elec
do not expose this appliance to

ATENCIÓN

:

ACCESO INTE

AUTORIZADO A PERSONAL

ACHTUNG

:

GEHÄUSE NIC

UND REPARATUR NUR DURC

ATTENTION

:

ENTRETIEN
INTERNES NE SONT AUTORI
PERSONNEL TECHNIQUE QU

UK WARNING

:

THIS APPA
NO OPERATOR SERVICEABLE
REFER SERVICING TO QUALIFI

Auto-Voltage Sele
10A RMS
20A Peak
88-127V

~

50-60Hz
700W RMS MAX

Operational voltag
Turn on 80V~ T
Turn on 160V~ T

Meyer Sound, B

Rear User Panel shown with the optional
Remote Monitoring System (RMS) panel

European Rear User Panel

with IEC 309 connector

Dimensions

All units in inches

Front Side Top

21.0"

30.0"

2.0"

20.50"

9.55"

14.26"

3

AC Power

The AC voltage operating ranges for the CQ Series are
85–134 V and 165–264 V, at 50 or 60 Hz. The CQ Series
performs surge suppression for high voltage transients
and can safely withstand voltages up to 275 VAC.

Power Requirements

The CQ 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 circuit breakers heat up at varying rates, it
is essential to understand the types of current ratings
and how they correspond to circuit breaker and cable
specifications.

Continuous voltages above 275 VAC may

damage the unit!

The Intelligent AC power supply protects the drivers
and amplifier components when an AC source is applied
to the CQ by

• auto-selecting the voltage;

• performing surge suppression and minimizing

inrush current;

• filtering EMI.

After three seconds, the main power supply is slowly
ramped on. The CQ Series uses a NEMA L6-20P or
IEC 309 male power inlet and satisfies UL, CSA, and
EC safety standards.

Use the following AC cable wiring diagram to create
international or special-purpose power connectors:

blue =
neutral

yellow/green =
earth ground
(chassis)

AC cable color code

brown = hot

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.

• 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).

The maximum continuous RMS current is the maximum
RMS current in a period 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.

The maximum burst RMS current is the maximum
RMS current in a period of approximately 1 second. It
is used to select the rating for most magnetic breakers.

The maximum 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

Vpk

= Ipk x Total Cable Resistance

drop

Use the table below as a guide to select cables and
circuit breakers with appropriate ratings for your
operating voltage.

sgnitaRtnerruCseireSQC

V511 V032 V001

SMRsuounitnoC.xaM

SMRtsruB.xaM

A8

A51

tsruBgniruDkaeP.xaM

A22

A4

SMR

A8

SMR

A11

KAEP

A01

SMR

SMR

KAEP

SMR

A81

SMR

A52

KAEP

The minimum electrical service amperage required by
a system of CQs is the sum of the maximum continuous
RMS current for each speaker. We recommend allowing
an additional 30% above the minimum amperage to
prevent peak voltage drops at the service entry.

4

Safety Issues

Pay close attention to these important electrical and
safety issues.

Use a power cord adapter to drive the CQ from a
standard 3-prong outlet (NEMA 5-15R; 125 V max).

earth
ground

chassis
ground

The CQ 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.

Audio Input

The CQ presents a 10 kΩ input impedance to a three-pin
XLR connector wired with the following convention:

Pin 1 — 220 kΩ to chassis and earth ground (ESD clamped)
Pin 2 — Signal
Pin 3 — Signal
Case — Earth (AC) ground and chassis

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.

Shorting an input connector pin to the case
can form a ground loop and cause hum.

A single source can drive multiple CQs 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 CQ is 10 kΩ, cascading 20 CQs
produces a balanced input impedance of 500 Ω. If a
150 Ω source is used, the 500 Ω load results in a 2.28 dB
loss.

Differential Inputs

Keep all liquids away from the CQ 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.

Troubleshooting

If the Active lamp does not light after connection to an
AC source for three seconds, the problem is probably in
the power supply. In the unlikely case that the circuit
breakers trip (the white center buttons pop out), the
amplifier or power supply may be malfunctioning.
Do not reset the breakers! Contact Meyer Sound for repair
information.

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 your audio and
AC power sources.

If problems persist, contact Meyer Sound. If repairs
are necessary, the CQ’s modular components are easy
to remove and ship.

5

Limiting and Protection
Circuitry

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 the frequency content of the source material and
thermal variations in the speaker’s voice coil and magnet.
Conventional limiters begin limiting prematurely,
which under-utilizes system headroom and deprives
the speaker 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

Troubleshooting with TPL

The TPL LEDs can indicate serious driver problems, if
interpreted correctly. If one CQ in a system exhibits
substantially more TPL activity than others receiving the
same audio signal, then the driver corresponding to
the excessively active LED may have a short circuit. This
is a potentially dangerous condition for the electronics;
shut the CQ 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 CQs 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.

TPL can indicate an imbalance in a configuration of
speakers by functioning like a spectrum analyzer. If the
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.

• allows the speaker to deliver its highest SPL
across its entire frequency range during limiting;

• eliminates long-term power compression when
operated at high levels for extended periods;

• protects the drivers and extends the lifetime of
amplifier and driver components.

Hi Limit and Lo Limit LEDs on the user panel indicate
TPL activity for the high and low frequency drivers,
respectively. The limiters for each driver function
independently and do not affect the signal when the
LEDs are inactive. Limiting begins when the driver
temperature exceeds the maximum safe level and
ceases when the temperature returns to normal.

The CQ performs within its acoustical specifications
and operates at a normal temperature if the limit LEDs
are on for no longer than two seconds, and off for at
least one second. If the LEDs remain on for longer
than three seconds, the CQ is hard limiting with the
following 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 low and high
frequency drivers alters the frequency response.

• Driver and amplifier components are subjected
to maximum heat, which shortens their life span.

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.

6

Fans and Cooling System

The CQ uses a forced-air cooling system with two fans
to prevent the amplifiers from overheating. A variable­speed 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 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.

In the unusual event that the temperature reaches
74°C, the secondary fan turns on and is clearly audible.
The secondary fan turns on in response to

• primary fan failure (check its status immediately);

• high source levels for a prolonged period in hot
temperatures or direct sunlight;

• driver failure.

The secondary fan turns off when the temperature
decreases to 68°C.

In the highly unlikely event that the secondary fan
does not keep the temperature below 85°C, the CQ
automatically shuts down until AC power is removed
and reapplied. If the CQ shuts down again after cooling
and reapplying AC power, contact Meyer Sound for
repair information.

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. Make
sure that the air ducts are clear and that there is at
least 6 inches clearance for exhaust behind the cabinet.

Rigging

The maximum recommended load for a CQ with air­craft pan fittings is 500 lb (228kg). This working load
is one-fifth the cabinet’s breaking strength. The CQ
has two rigging brackets on both the top and bottom
of the cabinet; each bracket is capable of supporting
the full working load of the cabinet.

rigging brackets

(two on top, two on bottom)

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.

cooling
fans

air

heatsinks

power
supply

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 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.

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
inspect the rigging hardware regularly and replace
worn or damaged components immediately.

The standard model should not be installed outdoors
without weather protection. The cabinet, exposed
electronic circuitry, and drivers can all receive weather
protection treatment that allows the unit to be used
safely in wet conditions. Contact Meyer Sound for
information about weather-protected units.

NOTE: All Meyer Sound products must be used in
accordance with local, state, federal, and industry
regulations. It is the owner’s and/or user’s responsibility
to evaluate the reliability of any rigging method for
their application. Rigging should be done only by
experienced professionals.

7

Complete Systems

Meyer Speaker Types

The following Meyer speakers will be mentioned in
the example applications.

Speaker Placement and Polarity

The cabinets in the following example configurations
are in a close-proximity coplanar orientation, unless
otherwise stated. Placing the mid-hi speaker more
than 5 feet from the subwoofer may require setting the
speakers to opposite polarities to compensate for the
propagation delay between them.

In a coplanar orientation, externally amplified Meyer
subwoofers require the opposite polarity setting to
all Meyer self-powered speakers.

We recommend using the Meyer SIM® System II
Sound Analyzer and CP-10 Parametric Equalizer to

• assist the process of configuring and placing
speakers in a system;

• measure propagation delays to set the correct
polarity between speakers;

• 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.

MSL-4: Self-powered mid-hi speaker

DS-2P: Self-powered mid-bass speaker

650-P, PSW-2,

PSW-4: Self-powered subwoofers

650-R2, MSW-2,

USW-1: Externally amplified subwoofers

The self-powered speakers listed above have a loop
connection to send the input signal to another speaker.

CQ and 650-P

The CQ is particularly well matched with the 650-P and
also performs efficiently with the PSW-2 and PSW-4.
Due to the overlap in frequency response between
the CQ and the subwoofer, the system frequency
response contains a rise in the range 40–120 Hz. 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.

CP-10 EQ

(1 Channel)

input

loop

CQ-1 or
CQ-2

The LD-1A Line Driver

We recommend using the Meyer LD-1A Line Driver
to integrate different types of Meyer self-powered
speakers into a full-range system. The LD-1A maintains
signal integrity for long cable paths, has two channels
equipped to control a main system, and six auxiliary
channels for down-fill, front-fill, and delay systems. The
LD-1A provides these 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 Array EQ switch activates a filter (6 dB cut
at 220 Hz, 0.6 octave bandwidth) to equalize
groups of 3 to 5 horizontally arrayed MSL-4s.

• The DS-2 & Sub Crossover switch activates a
crossover network that sends frequencies below
80 Hz to the Sub output, and above 80 Hz to the
DS-2 output. With the switch out, a full-range
signal is sent to the DS-2 and Sub outputs.

• The DS-2 φ and Sub φ switches toggle the polarity
for the DS-2 and Sub outputs.

• The Mid-Hi, DS-2, and Sub outputs each have
their own gain control and mute switch.

650-P

Set the CQ and 650-P to the same polarity.

CQ and 650-R2

Although it is preferable to use the CQ in a completely
self-powered system, excellent results can still be
achieved using the 650-R2, USW-1, and MSW-2.

CP-10 EQ

(1 Channel)

B-2EX

CEU

Set the CQ and the 650-R2‘s amplifier to opposite
polarities.

input

loop

Amplifier

CQ-1 or
CQ-2

650-R2
subwoofer

8

LD-1A with CQ and 650-P

Activating the Lo Cut filter on the LD-1A for the Mid-Hi
output also eliminates the low frequency rise caused
by the overlap between the CQ and 650-P. Although a
typical CQ : 650-P ratio is 2:1, separate Sub and Mid-Hi
level controls on the LD-1A allow the ratio to vary
while maintaining control of the spectral balance of
the system.

CQ-1 or

Mid-hi

LD-1A

Line Driver

Sub

CQ-2

650-P

CH 5 controls the CQ down-fill system. Since the main
system is normally set to a higher volume 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 overlapping coverage area:

• Set the CQ to the opposite polarity to the MSL-4
and DS-2P to phase align the mid-hi frequencies and
minimize the MSL-4’s low frequency down-lobe.

• Use the CH 5 Lo Cut filter to eliminate the low
frequency rise caused by the overlap with the
650-P/DS-2P systems.

• Delay the down-fill to compensate for the
propagation delay between the down-fill and
main systems in the intersecting coverage area.
(This is highly recommended, but not required.)

Set the CQ and 650-P to the same polarity.

LD-1A with Flown MSL-4, DS-2P, and CQ;
650-P on the Floor

This example shows the LD-1A integrating a complete
system of speakers appropriate for a large venue.
Although channels 1, 3, and 5 constitute half of a
complete system, channels 2, 4, and 6 can be used
with identical connections to create the other half of
the system. The MSL-4 mid-hi, DS-2P mid-bass, and
CQ down-fill speakers are flown; the 650-P subwoofers
are on the floor.

The Mid-Hi and CH 3 outputs drive the inner three
and outer two speakers, respectively, of the MSL-4
array. These two outputs apply appropriate levels for
speakers directed at audience locations at different
distances from the main system. The diagram shows the
additional mid-hi output created by connecting the
CH 1 Loop to the CH 3 input. Using a Y-connection at
the CH 1 input, as shown for the down-fills, accomplishes
the same signal routing.

The Lo Cut and Array EQ switches for the Mid-Hi and
CH 3 outputs should be in. The Lo Cut filter eliminates
the rise caused by the overlap between the MSL-4 and
DS-2P/650-P systems. The Array EQ filter minimizes
the low-mid rise caused by the MSL-4 array.

We recommend using the Meyer SIM System II Sound
Analyzer and CP-10 Parametric Equalizer to optimize this
configuration.

MSL-4 Mid-Hi

LD-1A

CP-10 EQ

Delay

CP-10 EQ

Set the MSL-4 and DS-2P to the same polarity; reverse
the polarity for the CQ. The polarity for the 650-P depends
on the displacement from the flown system.

CH 1

Input Mid-Hi

Output

CH 3

CH 5

DS-2

Output

Sub

Output

Loop

Input Output

Input Output

DS-2P Mid-Bass

CQ Down-fills

650-P Subwoofers

The DS-2 and Sub outputs drive the DS-2P and 650-P
systems with the DS-2 & Crossover switch in. Set the
MSL-4 and DS-2P to the same polarity. The polarity of
the 650-P depends on the displacement from the flown
system.

9

Verifying Polarity

Incorrect driver polarity impairs system performance
and may damage the drivers. All Meyer Sound
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, check the polarity between
adjacent loudspeakers and between drivers in the
same cabinet.

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 six 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.

Top view of adjacent speakers with

measurement microphone

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 three ft from the
front of the loudspeaker at the midway point
between the low and high frequency drivers.

2. Connect a signal source to the loudspeaker and
note the frequency response.

!

Since polarity reversal causes excessive driver
excursion at high source levels, use moderate levels
when conducting this test.

Drivers with correct
polarity cause acoustic
addition

The polarity is correct if the frequency response is smooth
through the crossover region (±4 dB 600 Hz – 1 kHz).
Severe cancellation in the crossover region indicates
polarity reversal.

Drivers with reversed
polarity cause acoustic
cancellation

Correct polarity causes
acoustic addition

The polarity is correct if the frequency response
remains constant with a significant increase in
amplitude. Broadband cancellation (decreased overall
level) indicates polarity reversal.

Opposite polarity causes
acoustic cancellation

10

Coverage Angles and
Polar Plots

Coverage Angles

The coverage angles for the CQ Series over a wide
frequency range are summarized in the following table:

selgnAegarevoCseireSQC

1

latnoziroh

)stniopBd6–(1-QC 08 ° 04 °
)stniopBd01–(1-QC 001 ° 05 °
)stniopBd6–(2-QC 05 ° 04 °
)stniopBd01–(2-QC 06 ° 05 °

1. CQ-1: 500 Hz–16 kHz; CQ-2: 800 Hz–12 kHz

2. CQ-1 and CQ-2: 1.5–12 kHz

2

lacitrev

The table below lists the maximum on-axis peak dB SPL
per octave measured at 1 m for the CQ-1 and CQ-2.

LPSBdkaePmumixaM

ycneuqerF 1-QC 2-QC

zH521 721721

zH052 031031

zH005 031031

zHk1 231931

zHk2 631931

zHk4 631931

zHk8 231431

zHk61 221421

The –6 dB points denote the angle at which the measured
SPL has decreased to half its on-axis value. The –10 dB
points represent the angle at which the perceived SPL
has decreased to half its on-axis value.

Polar Plots

The data for the CQ Series polar patterns was measured
in Meyer Sound’s anechoic chamber (photo at right)
with the SIM System II Sound Analyzer in dB SPL at a
distance of 14 ft, using angular and frequency resolutions
of 1° and 1⁄24 octave, respectively. The polar plots on
the following pages have been smoothed to angular
and frequency resolutions of 2° and 1 octave, and
normalized to 0 dB on-axis. Each polar pattern shows
the response of a 1 octave band centered at the frequency
indicated on the plot; there are no gaps in the data
from 125 Hz to 16 kHz.

The polar patterns reveal that the CQ-1 has a wider
horizontal coverage pattern than the CQ-2 and that
their vertical coverage is virtually identical. The uniform
beam width that distinguishes the CQ Series is evident
in their polar patterns in the horn’s range (1–16 kHz);
note the lack of side or back lobes.

Meyer Sound’s anechoic chamber

11

CQ-1: 125 Hz

CQ-1 Polar Plots

Inner plot is vertical unless

otherwise indicated.

vertical

CQ-1: 250 Hz

vertical

vertical

CQ-1: 1 kHzCQ-1: 500 Hz

CQ-1: 4 kHzCQ-1: 2 kHz

CQ-1: 8 kHz CQ-1: 16 kHz

12

CQ-2: 125 Hz

CQ-2 Polar Plots

Inner plot is vertical unless

otherwise indicated.

vertical

CQ-2: 250 Hz

vertical

vertical

CQ-2: 1 kHzCQ-2: 500 Hz

CQ-2: 4 kHzCQ-2: 2 kHz

CQ-2: 8 kHz CQ-2: 16 kHz

13

Array Design

Creating an effective array with the CQ 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.

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.

As the splay angle increases toward the coverage
angle, the on-axis power decreases, but the variations
in frequency response diminish. As the splay angle
increases beyond the coverage angle, noticeable gaps
begin to form in the array’s coverage area.

NOTE: The trapezoidal shape of the CQ does not
represent the horizontal coverage area of the speaker
or the intended splay angle for horizontal arrays. The
20° angle of the CQ enclosure is narrower than the
minimum recommended splay angle.

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 four
elements each, at numerous splay angles. The measurements
were conducted at a distance of 8 m with half-space
loading; on-axis SPL values were interpolated from
8 m to 1 m. The coverage angle for the array is the result
of averaging the –6 dB points from 125 Hz to 8 kHz.

The horizontal splay angles in the tables below represent
the optimal configurations for narrow and wide coverage
areas; note the different angles for the CQ-1 and CQ-2.
The vertical angles represent the optimal narrow (15°),
middle (30°), and wide (40°) orientations for both the
CQ-1 and CQ-2. The 2@0° LT denotes the long throw
configuration: the two horns are coupled directly
together (top speaker upside down/bottom speaker
upright) to form a single narrow horn.

The following tables show the SPL and coverage areas
that result from grouping the CQ-1 and CQ-2 in arrays
of up to four units horizontally and two rows vertically.
All splay angles refer to the angle between cabinet
centers. If this information does not address your
application requirements, contact Meyer Sound to
obtain additional information on array design.

CQ-1 Array Coverage and Maximum SPL Chart

Number of Horizontal

CQ units @ Angle

Number of Vertical

Rows of CQ @ Angle

1 80° 40° 136 100° 40° 140 150° 40° 139 170° 40° 140 220° 40° 138 220° 40° 141 300° 40° 139
2 @ 0° (LT) 80° 20° 142 100° 20° 146 150° 20° 145 170° 20° 146 220° 20° 144 220° 20° 147 300° 20° 145
2 @ 15° 80° 45° 140 100° 45° 144 150° 45° 143 170° 45° 144 220° 45° 142 220° 45° 145 300° 45° 143
2 @ 30° 80° 60° 139 100° 60° 143 150° 60° 142 170° 60° 143 220° 60° 141 220° 60° 144 300° 60° 142
2 @ 40° 80° 80° 138 100° 80° 142 150° 80° 141 170° 80° 142 220° 80° 140 220° 80° 143 300° 80° 141

1 2 @ 50° 2 @ 70° 3 @ 50° 3 @ 70° 4 @ 50° 4 @ 70°

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

CQ-2 Array Coverage and Maximum SPL Chart

Number of Horizontal

CQ units @ Angle

Number of Vertical

Rows of CQ @ Angle

1 50° 40° 139 70° 40° 143 90° 40° 142 100° 40° 144 130° 40° 144 130° 40° 145 170° 40° 144
2 @ 0° (LT) 50° 20° 145 70° 20° 149 90° 20° 148 100° 20° 150 130° 20° 150 130° 20° 151 170° 20° 150
2 @ 15° 50° 45° 143 70° 45° 147 90° 45° 146 100° 45° 148 130° 45° 148 130° 45° 149 170° 45° 148
2 @ 30° 50° 60° 142 70° 60° 146 90° 60° 145 100° 60° 147 130° 60° 147 130° 60° 148 170° 60° 147
2 @ 40° 50° 80° 141 70° 80° 145 90° 80° 144 100° 80° 146 130° 80° 146 130° 80° 147 170° 80° 146

1 2 @ 30° 2 @ 40° 3 @ 30° 3 @ 40° 4 @ 30° 4 @ 40°

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

14

Safety Summary

English Français

• To reduce the risk of electric shock, disconnect the loud­speaker from the AC mains before installing audio cable.
Reconnect the power cord only after making all signal
connections.

• Connect the loudspeaker 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 install the loudspeaker in wet or humid locations
without using weather protection equipment from Meyer
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.

• This loudspeaker 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.

!

• Pour réduire le risque d’électrocution, débranchez la
prise 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 coupe­circuit). 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.

• Ne pas installer l’haut-parleur dans un endroit où il y a
de l’eau ou une humidité excessive.

• Ne pas laisser de l’eau ou tout objet pénétrer dans l’haut­parleur. 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, conservez­la 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. Toutes les réparations doivent être
effectuées par du personnel qualifié et agréé par le
constructeur.

Deutsch Español

• Um die Gefahr eines elektrischen Schlages auf ein
Minimum zu reduzieren, den Lautsprecher vom
Stromnetz trennen, bevor ggf. ein Audio­Schnittstellensignalkabel angeschlossen wird. Das
Netzkabel erst nach Herstellung aller
Signalverbindungen wieder einstecken.

• Der Lautsprecher an eine geerdete zweipolige
Dreiphasen-Netzsteckdose anschließen. Die Steckdose
muß mit einem geeigneten Abzweigschutz (Sicherung
oder Leistungsschalter) verbunden sein. Der Anschluß
der unterbrechungsfreien Stromversorgung an einen
anderen 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.

• Um ein Überhitzen dem Lautsprecher zu verhindern,
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.

• Para reducir el riesgo de descarga eléctrica, desconecte
de 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 sea un fusible o un disyuntor). La
conexión a cualquier otro tipo de tomacorriente puede
constituir peligro de descarga eléctrica y violar los
códigos eléctricos locales.

• No instale el altoparlante en lugares donde haya agua o
humedad excesiva.

• No deje que en el altoparlante entre agua ni ningún
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.

• Este altoparlante 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.

15

Acoustical

Frequency Response
Phase Response
Maximum Peak SPL
Dynamic Range

1

1

1

2

Coverage

CQ-1

–6 dB points
–10 dB points

CQ-2

–6 dB points
–10 dB points

Transducers

Low Frequency
High Frequency

Acoustical Crossover Point

CQ-1
CQ-2

Amplifiers

Type
Burst Capability
THD, IM, TIM

3

Audio Input

Type
Connector
Nominal Input Level

Specifications

±4 dB 40 Hz – 18 kHz
±90° 50 Hz – 16 kHz

CQ-1: 136 dB ; CQ-2: 139 dB
> 110 dB

H: 80° (500 Hz – 16 kHz); V: 40° (1.5 kHz – 12 kHz)
H:100° (500 Hz – 16 kHz); V: 50° (1.5 kHz – 12 kHz)

H: 50° (800 Hz – 12 kHz); V: 40° (1.5 kHz – 12 kHz)
H: 60° (800 Hz – 12 kHz); V: 50° (1.5 kHz – 12 kHz)

15” diameter MS-15 cone
4” diaphragm MS-2001CQ horn compression driver

700 Hz
900 Hz

Complementary power MOSFET output stages class AB/H
1240 Watts (620 Watts/channel)
< .02 %

10 kΩ impedance, electronically balanced
XLR (A-3) male and female
+4 dBu (1.23 Vrms)

AC Power

Connector
Automatic voltage selection
Max Continuous RMS Current (> 10 s)
Max Burst RMS Current (< 1 s)
Max Peak Current During Burst
Soft Current Turn-on

4

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

Physical

Dimensions
Weight
Enclosure/Finish
Protective Grill
Rigging

1. Subject to half-space loading; measured
with one-third octave frequency resolution
in fixed ISO bands.

2. Measured as the ratio between the peak
SPL and the A-weighted noise floor.

21” W x 30” H x 22 1⁄2” D
130 lb (59 kg); shipping: 150 lb (68 kg)
All birch plywood/black textured
Perforated steel grill, charcoal-grey foam

Four aircraft pan fittings (two on top and bottom).
Working load for each fitting is 500 lb (1⁄5 the cabinet
breaking strength) with straight tensile pull.

Notes

3. Nominal 8 Ω resistive load, pink noise,
100 V peak.

4. The unit is rated at 88 – 125 VAC and
182 – 235 VAC, 50/60 Hz, to satisfy EC
standards for –10% to 6% AC line voltage.

16

Copyright © 1997 Meyer Sound Laboratories, Inc.

All rights reserved

Part # 05.041.010.01 Rev A