Meyer Sound CQTM 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