Meyer Sound Cq 1 Users Manual DS_CQ

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DATASHEET

CONCERT SERIES

CQ-1 : Wide Coverage Main Loudspeaker
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Dimensions 21.00" w x 30.00" h x 22.20" d
(533 mm x 762 mm x 564 mm)
Weight 130 lbs (58.97 kg); shipping 150 lbs (68.04 kg)
Enclosure All birch multi-ply
Finish Black textured
Protective Grille Perforated hex metal grille frame with charcoal-grey foam
Rigging Ring and stud pan fittings, two on both top and bottom.
Working load for each fitting is 500 lbs (226.80 kg), which
is 1/5 the cabinet breaking strength (with straight tensile
pull); 3/8” or metric M10 nut plates optional

The CQ-1 wide coverage main is a selfpowered, phase-corrected reinforcement
loudspeaker offering precise, low-Q coverage. The CQ-1 features a patented constant-Q horn design — the result of extensive research using Meyer Sound’s calibrated anechoic chamber. The frequency
response of 40 Hz to 16 kHz is uniform over
the entire coverage area in both the horizontal and vertical axes, with no side lobes
even when measured at a one-sixth octave
frequency resolution.
The CQ-1 loudspeaker’s unique combination of precise pattern control, compact
size, low distortion and high power make it
suitable for a wide variety of installed and
rental applications. The CQ-1 is perfect as
the main PA in small- to mid-sized auditoriums, houses of worship, clubs and hotel
ballroom settings, and is highly effective
in delayed fill applications for arenas and
outdoor concert systems.
The CQ-1 loudspeaker’s low-frequency
section comprises a single 15-inch Meyer
Sound cone driver, and the high-frequency
section utilizes a 4-inch diaphragm com-

pression driver coupled to an 80-degree by
40-degree constant-Q horn.
The sophisticated MP-2/CQ-1 power amplifier is integrated into an accessible,
lightweight rear module. The amplification,
processing and protection circuitry produces consistent and predictable results in any
system design. The proprietary two-channel amplifier employs Meyer Sound’s proven class AB/H design with complementary
MOSFET output stages, and delivers 1240
watts burst power (620 watts per channel).
Audio is processed through an electronic
crossover and correction filters for phase
and frequency response, as well as driver
protection circuitry.
Each amplifier channel has TruPower® limiting technology which maximizes loudspeaker reliability, minimizing power
compression and extending component
life. TruPower also affords higher continuous SPL capability at all frequencies with
maximum headroom and regulates voice
coil temperature. Limiter activity is easy
to monitor with the limit LEDs on the rear
panel.

features & benefits

The MP-2/CQ-1 amplifier’s power supply
incorporates Meyer Sound’s Intelligent AC™
system, which performs automatic voltage
selection, EMI filtering, soft current turn-on
and surge suppression. Intelligent AC allows
fail-safe operation worldwide, with no need
to manually select the AC mains voltage.
The compact CQ-1 system is housed in an
all-birch multi-ply enclosure with a textured, hard shell black finish. It is flyable and
arrayable using standard ring and stud pan
fittings on top and bottom rated at 500 lbs
(226.80 kg) with a 5:1 safety factor. An optional mounting yoke allows flexible, quick
installation and easy aiming in theatrical
and permanent applications.
Options for the CQ-1 cabinet include weather protection and finishes in custom colors
for fixed installations and other situations
requiring specific cosmetics.
The CQ-1 integrates with the optional RMS™
remote monitoring system, which displays
signal and power levels, driver status, limiter activity, and amplifier temperature on a
remote Windows® computer.

applications

Extremely smooth horizontal pattern for
consistent sound

Extended low-frequency response for
stand-alone applications

Concert halls, theatres and houses of
worship

Ultra-low distortion yields remarkable
fidelity

Constant-Q horn affords uniform
response throughout the coverage area.

Downfill and delays in large-scale
reinforcement

Extraordinarily flat amplitude and phase
response for tonal accuracy and precise
imaging

Predictable performance ensures system
design flexibility

Stage monitoring side fill
Paging and announcing
Cinema and 5.1 applications

CQ-1 specifications
Notes:
Acoustical

1

Operating Frequency Range
Frequency Response2
Phase Response
Maximum Peak SPL3
Dynamic Range

1. Recommended maximum operating
frequency range. Response depends
on loading conditions and room
acoustics.
2. Free field, measured with 1/3-octave
frequency resolution at 4 meters.
3. Measured with music at 1 meter.
4. At this frequency, the low- and highfrequency transducers produce equal
sound pressure levels.
5. Power handling is measured under
AES standard conditions: transducer
driven continuously for two hours
with band-limited noise signal having
a 6 dB peak-average ratio.
6. Amplifier wattage rating is based
on the maximum unclipped burst
sine-wave rms voltage the amplifier
will produce into the nominal load
impedance. Both channels 70 V rms
(100 V pk) into 8 ohms

35 Hz - 18 kHz
40 Hz - 16 kHz ±4 dB
50 Hz - 16 kHz ±90°
136 dB
>110 dB

Coverage
80° Horizontal x 40° vertical

Crossover4

700 Hz
Transducers
Low Frequency

One 15" cone driver
Nominal impedance: 8 Ω
Voice coil size: 3"
Power-handling capability: 600 W (AES)5
One 4" diaphragm driver
Nominal impedance: 8 Ω 
Voice coil size: 4"
Diaphragm size: 4"
Exit size: 1.5"
Power handling capability: 250 W (AES)5

High Frequency

Audio Input
Type Differential, electronically balanced
Maximum Common Mode Range ±15 V DC, clamped to earth for voltage transient protection
Connectors Female XLR input with male XLR loop output or VEAM all-in-one
(integrates AC, audio and network)
Input Impedance 10 kΩ differential between pins 2 and 3
Wiring Pin 1: Chassis/earth through 220 kΩ, 1000 pF, 15 V clamp network to
provide virtual ground lift at audio frequencies
Pin 2: Signal +
Pin 3: Signal - (Polarity can be changed on user panel)
Case: Earth ground and chassis
DC Blocking None on input; DC blocked through signal processing
CMRR >50 dB, typically 80 dB (50 Hz – 500 Hz)
RF Filter Common mode: 425 kHz; Differential mode: 142 kHz
TIM Filter <80 kHz, integral to signal processing
Nominal Input Sensitivity 0 dBV (1 V rms, 1.4 V pk) continuous average is typically the onset of
limiting for noise and music.
Input Level Audio source must be capable of producing a minimum of +20 dBV
(10 V rms, 14 V pk) into 600 Ω to produce maximum peak SPL over the
operating bandwidth of the loudspeaker
Amplifier
Type
Output Power6
THD, IM, TIM
Load Capacity
Cooling

Two-channel complementary MOSFET output stages (class AB/H)
1240 W (620 W/channel)
<.02%
8 Ω each channel
Forced air cooling, two fans total (one ultrahigh-speed reserve fan)

AC Power
Connector
Voltage Selection
Safety Agency Rated Operating Range
Turn-on and Turn-off Points
Current Draw: Idle Current
Max Long-Term Continuous Current (>10 sec)
Burst Current (<1 sec)
Ultimate Short-Term Peak Current Draw
Inrush Current
RMS Network (optional)

250 V AC NEMA L6-20 (twistlock) inlet, IEC 309 male inlet, or VEAM
Automatic, two ranges, each with high-low voltage tap (uninterrupted)
95 V AC - 125 V AC; 208 V AC - 235 V AC; 50/60 Hz
85 V AC - 134 V AC; 165 V AC - 264 V AC; 50/60 Hz
0.640 A rms (115 V AC); 0.320 A rms (230 V AC); 0.850 A rms (100 V AC)
8 A rms (115 V AC); 4 A rms (230 V AC); 10 A rms (100 V AC)
15 A rms (115 V AC); 8 A rms (230 V AC); 18 A rms (100 V AC)
22 A pk (115 V AC); 11 A pk (230 V AC); 25 A pk (100 V AC)
7 A pk (115 V AC); 7 A pk (230 V AC); 10 A pk (100 V AC)
Equipped for two conductor twisted-pair network, reporting amplifier
operating parameters to system operator’s host computer.

Made by Meyer Sound Laboratories
Berkeley, California USA
European Office:
Meyer Sound Lab. GmbH
Carl Zeiss Strasse 13
56751 Polch, Germany

CQ-1 — 04.041.011.01 C
Copyright © 2004
Meyer Sound Laboratories Inc.
All rights reserved
meyer sound laboratories inc.
2832 San Pablo Avenue
Berkeley, CA 94702
T: +1 510 486.1166
F: +1 510 486.8356
techsupport@meyersound.com
www.meyersound.com

architect specifications
The loudspeaker shall be a self-powered, full range system. The
transducers shall consist of a 15-inch diameter cone driver and
a 1.5-inch throat, 4-inch diaphragm compression driver on an
80-degree horizontal by 40-degree vertical constant-Q horn.

kHz. Phase response shall be ±90 degrees from 50 Hz to 16 kHz.
Maximum peak SPL shall be 136 dB at 1 meter. Beamwidth shall
be 80 degrees horizontal from 500 Hz to 16 kHz and 40 degrees
vertical from 1500 Hz to 12 kHz.

The loudspeaker system shall incorporate internal processing
electronics and a two-channel amplifier. Processing functions
shall include equalization, phase correction, driver protection
and signal division for the high- and low-frequency sections.
The crossover point shall be 700 Hz. Each amplifier channel
shall be class AB/H with complementary MOSFET output stages.
Burst capability shall be 620 watts each channel (1240 watts
total) with nominal 8-ohm resistive load. Distortion (THD, IM,
TIM) shall not exceed 0.02 percent. Protection circuits shall
include TruPower limiting.

The audio input shall be electronically balanced with a 10 kOhm
impedance and accept a nominal 0 dBV (1 V rms, 1.4 V pk) signal
(+20 dBV to produce maximum peak SPL). Connectors shall be
XLR (A-3) type male and female or VEAM all-in-one (integrates
AC, audio and network). RF filtering shall be provided. CMRR
shall be greater than 50 dB (typically 80 dB 50 Hz to 500 Hz).

Performance specifications for a typical production unit shall
be as follows: Operating frequency range shall be 35 Hz to 18

The internal power supply shall perform automatic voltage
selection, EMI filtering, soft current turn-on and surge suppression. Powering requirements shall be nominal 100 V, 110 V
or 230 V AC line current at 50 Hz or 60 Hz. UL and CE operating
voltage ranges shall be 95 to 125 V AC and 208 to 235 V AC.
Current draw during burst shall be 15 A at 115 V AC and 8 A at

230 V AC. Current inrush during soft turn-on shall not exceed 7
A at 115 V AC. AC power connectors shall be locking NEMA L620 connector, IEC 309 male or VEAM.
The loudspeaker system shall provide facilities for installing the
optional RMS remote monitoring and control system.
All loudspeaker components shall be mounted in an acoustically
vented trapezoidal enclosure constructed of birch plywood
with a hard black textured finish. The front protective grille
shall be perforated hex metal covered by charcoal gray foam.
Dimensions shall be 21.00” wide x 30.00” high x 22.20” deep
(533 mm x 762 mm x 564 mm). Weight shall be 130 lbs (58.97 kg).
Rigging points shall be four ring and stud pan fittings, two each
top and bottom, rated at 500 lbs (226.80 kg) per fitting at a 5:1
safety factor; 3/8-inch or metric M10 nut plates are optional.
The loudspeaker shall be the Meyer Sound CQ-1.



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