Professional Power Amplifiers
CMXa Series
CMX 300Va | CMX 500Va | CMX 800Va | CMX 2000Va
CMX 300Va | CMX 500Va |
CMX 800Va | CMX 2000Va
Features
• “Flex-Use” loading options allow you to
drive low-impedance loads down to 2 ohms
and certain models to drive 70 and 100V
distributed loudspeaker systems
• “Flex-Use” Input connectivity choices
including actively balanced barrier strip,
XLR, or ¼" TRS
• “Flex-Use” Output connectivity choices
include NL4 Speakon™ and detachable
terminal block
• Rack mountable with chassis less than 16"
or 40.6 mm deep
• 1 dB recessed, detented gain controls for
fast, accurate and repeatable settings
• Tamper-proof security cover for
gain controls
• Recessed rear DIP switches for easy
selection of stereo, parallel, or bridged
mode operation, and the additional choice
of enabling/disabling low frequency filter
protection
• Low-noise variable-speed fans with rear-tofront airflow keep amplifiers and racks cool
The New CMXa Series is an economical and
rugged power amplifier designed to meet the
needs of system integrators. It is based upon
the proven, rock-solid, reliable performance
found in the award winning RMX Series.
The CMXa feature sets are designed for
wide-ranging application in facilities such as
performance halls, houses of worship, sports
clubs, gymnasiums, dance venues, pubs, and
FGM/BGM systems. The CMXa Series provides
unmatched performance, the right power for
the job and an affordable price point.
Proven and Reliable Power Plant
CMXa amplifiers incorporate everything QSC
has learned in more than forty years of striving
to deliver worry-free operations without failures.
The design of these amplifiers starts with our
world-class power supplies. The CMXa uses a
powerful, high-current toroidal transformer and
filtering to ensure generous energy reserves.
This allows the amplifiers to effortlessly handle
high-level transients, even when driving abusive
2 ohm speaker loads.
The amplifier output sections feature rugged
class AB and class H architecture depending on
power level. Efficient class H output sections
on the CMX 800Va and CMX 2000Va reduce
AC current draw and cut down on waste heat.
All CMXa amplifiers are protected from damage
from shorted outputs. Automatic current
limiting protects the amplifier from damage
until the short is corrected.
CMXa amplifiers also feature DC protection
systems to prevent loudspeaker damage in
the unlikely event of an output transistor failure.
DC voltage from the power supply is never
passed directly to your speakers, even in the
event of an output circuit failure.
Superior Performance
The CMXa amplifiers deliver true and accurate
studio-quality sound. A full complementary
output circuit using high-grade linear output
devices generates accurate, flat-frequency
response with low distortion. SMT (Surface
Mount Technology) triples small-signal
component density, enabling high power
output in a 2 rack unit chassis (3 RU for the
CMX 2000Va). Unlike other designs, CMXa
output devices are directly mounted to the heat
sink for optimum thermal coupling and cooling.
The CMXa Series is available in four models.
Three 2-rackspace models range in power from
300 to 800 watts per channel at 4 ohms. One
3-rackspace model provides 2500 watts per
channel at 2 ohms. All four models feature a
compact chassis less than 16” deep.
The V in the model name designates the
ability to directly drive 70-volt and/or 100-volt
distributed loudspeakers. The CMX 300Va and
CMX 500Va must be configured for bridgedmono operation in order to directly drive
high-impedance systems while the CMX 800Va
and 2000Va may be used in either stereo or
mono mode.
For installations requiring a transformer isolated
output, the CMX has optional accessories to
cover your needs.
CMXa Power Amplifiers
Watts per channel
2RU Models 8Ω 4Ω* 2Ω** Bridged 4Ω**
CMX 300Va 200 300 430 830
CMX 500Va 300 500 700 1400
CMX 800Va 500 800 1200 2400
Watts per channel
3RU Model 8Ω 4Ω** 2Ω** Bridged 4Ω**
CMX 2000Va 1100 2000 2500 5000
1 kHz, 0.1% THD *1 kHz, 0.5% THD **1 kHz, 1% THD
CMXa Details
1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: 714/754-6174
CMXa Spec Sheet 08/9/2013
please recycle
© 2013 QSC Audio Products, LLC. All rights reserved. QSC and the QSC logo are registered trademarks of QSC Audio Products, LLC in the U.S. Patent and Trademark
office and other countries. Speakon is a trademark of Neutrik. All other trademarks are the property of their respective owners. Patents may apply or be pending.
Specifications subject to change without notice.
CM X300Va CMX 500Va CMX 800Va CMX 2000Va
Stereo Mode (both channels driven)
8Ω / FTC 20 Hz – 20 kHz / 0.1% THD
8Ω / EIA 1 kHz / 0.1% THD
4Ω / FTC 20 Hz – 20 kHz / 0.1% THD
4Ω / EIA 1 kHz / 0.5% THD
2Ω / EIA 1 kHz / 1% THD
70V Direct Drive / EIA 1 kHz / 1% THD
100V Direct Drive / EIA 1 kHz / 1% THD
185 W
200 W
280 W
300 W
430 W
–
–
260 W
300 W
400 W
500 W
700 W
–
–
450 W
500 W
650 W
800 W
1200 W
400 W
–
1050 W
1100 W
1600 W
2000 W (1% THD)
2500 W
2500 W
1000 W
Bridge Mono Mode
8Ω / FTC 20 Hz – 20 kHz / 0.1% THD
8Ω / EIA 1 kHz / 0.1% THD
4Ω / EIA 1 kHz / 1% THD
70V Direct Drive / EIA 1 kHz / 1% THD
100V Direct Drive / EIA 1 kHz / 1% THD
530 W
600 W
830 W
600 W
–
800 W
900 W
1400 W
1200 W
600 W
1300 W
1500 W
2400 W
2000 W
2300 W
3200 W
3600 W
5000 W
5000 W
3600 W
Signal to Noise (20 Hz – 20 kHz, 8Ω) > -100 dB > - 100 dB > - 100 dB > - 100 dB
Input Sensitivity at 8Ω 1.15 V (+3.4 dBu) 1.14 V (+3.4 dBu) 1.23 V (+4.0 dBu) 1.42 V (+5.3 dBu)
Voltage Gain at 8Ω 31.6 x (30 dB) 40 x (32 dB) 46 x (33 dB) 64 x (36 dB)
Output Circuitry Class AB Class AB 2-tier Class H 3-tier Class H
Power Requirements
Typical, 1/8 power pink noise at 4Ω, 120 VAC
Typical, 1/8 power pink noise at 4Ω, 230 VAC
Severe, 1/3 power pink noise at 4Ω, 120 VAC
Severe, 1/3 power pink noise at 4ΩΩ, 230 VAC
4.4 A
2.2 A
6.6 A
3.3 A
5.4 A
2.7 A
9.6 A
4.8 A
6.3 A
3.2 A
15.6 A
7.8 A
13.9 A
7 A
26.9 A
13.5 A
Distortion (SMPTE-M) < 0.02% < 0.01% < 0.01% < 0.01%
Distortion (typical)
20 Hz – 20 kHz: 10 dB below rated power
1.0 kHz and below: full-rated power
< 0.03% THD / 4Ω and 8Ω
< 0.03% THD / 4Ω and 8Ω
Frequency Response 20 Hz – 20 kHz: ±1 dB -3 dB points: 5 Hz – 50 kHz
Damping Factor (1 kHz and below) > 300 at 8Ω
Input Impedance 10k ohms unbalanced, 20k ohms balanced
Input Clipping 10 Vrms (+22 dB)
Cooling Continuously variable-speed fan, rear-to-front air flow
Connectors (each channel) Input: Active balanced; barrier strip, XLR and ¼" (6.3 mm) – TRS tip and XLR pin 2 positive
Output: Detachable terminal block and Neutrik™ Speakon™
Controls Front: AC switch, Ch. 1 & 2 gain knobs
Rear: 10-position DIP switch
Indicators Power-on: Green LED / Signal: Green LED (1 per channel) / Clip: Red LED (1 per channel)
Amplifier Protection Stable into reactive or mismatched loads
Load Protection On/off muting, AC coupling (CMX 300Va and CMX 500Va), triac crowbar (CMX 800Va and CMX 2000Va
on each channel)
Power Requirements 120 and 230 VAC, 50 – 60 Hz
Dimensions (HWD)
2 RU models
3 RU model (CMX 2000Va)
3.5" (8.9 cm) 2 rack spaces x 19" (48.3 cm) rack mounting x 15.9" (40 cm) deep to rear support ears
5.25" (13.3 cm) 3 rack spaces x 19" (48.3 cm) rack mounting x 15.9" (40 cm) deep to rear support ears
Weight - Net 35 lb (15.9 kg) 40 lb (18.2 kg) 44.5 lb (20.2 kg) 75 lb (33.1 kg)
Weight - Shipping 41 lb (18.6 kg) 46 lb (20.9 kg) 50.5 lb (23 kg) 87 lb (37.2 kg)