QSC Audio CMX 2000V, CMX800V, CMX300V, CMX500V User Manual

Contractor “Flex-Use” Specific Features

The CMX Series is packed full of professional features that increase
performance and flexibility.

• “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-to-front airflow keep
amplifiers and racks cool

CMX Series

Professional Power Amplifiers

CMX300V | CMX500V | CMX800V | CMX2000V

The New CMX 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 CMX 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 CMX
Series provides unmatched performance, the right power for the job and
an affordable price point.

Proven and Reliable Power Plant

CMX 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
CMX 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 CMX800V and CMX2000V reduce AC current draw and cut down
on waste heat.

All CMX amplifiers are protected from damage from shorted outputs.
Automatic current limiting protects the amplifier from damage until the
short is corrected.

CMX 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 CMX 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
CMX2000V). Unlike other designs, CMX output devices are directly
mounted to the heat sink for optimum thermal coupling and cooling.

The CMX 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 CMX300V and CMX500V
must be configured for bridged-mono operation in order to directly drive
high-impedance systems while the CMX800V and 2000V 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.

CMX Power Amplifiers

Watts per channel
2RU Models 8Ω 4Ω* 2Ω** Bridged 4Ω**

CMX300V 200 300 430 830

CMX500V 300 500 700 1400

CMX800V 500 800 1200 2400

Watts per channel
3RU Model 8Ω 4Ω** 2Ω** Bridged 4Ω**

CMX2000V 1100 2000 2500 5000

1 kHz, 0.1% THD *1 kHz, 0.5% THD **1 kHz, 1% THD

CMX Series

CMX300V CMX500V CMX800V CMX2000V

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

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

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 31.6x (30 dB) 40x (32 dB) 46x (33 dB) 64x (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

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

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

Controls Front: AC switch, Ch. 1 & 2 gain knobs

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 (CMX300V and CMX500V), triac crowbar (CMX800V and CMX2000V on each channel)

Power Requirements 120 and 230 VAC, 50 – 60 Hz

Dimensions (HWD)

2 RU models
3 RU model (CMX2000V)

185 W
200 W
280 W
300 W
430 W
–
–

530 W
600 W
830 W
600 W
–

4.4 A

2.2 A

6.6 A

3.3 A

< 0.03% THD / 4Ω and 8Ω
< 0.03% THD / 4Ω and 8Ω

Output: Detachable terminal block and Neutrik™ Speakon™

Rear: 10-position DIP switch

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

Continuous average output power per channel

260 W
300 W
400 W
500 W
700 W
–
–

800 W
900 W
1400 W
1200 W
600 W

5.4 A

2.7 A

9.6 A

4.8 A

Preliminary Specifications

450 W
500 W
650 W
800 W
1200 W
400 W
–

1300 W
1500 W
2400 W
2000 W
2300 W

6.3 A

3.2 A

15.6 A

7.8 A

1050 W
1100 W
1600 W
2000 W (1% THD)
2500 W
2500 W
1000 W

3200 W
3600 W
5000 W
5000 W
3600 W

13.9 A
7 A

26.9 A

13.5 A

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)

Specifications subject to change without notice.

©2010 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.

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CMX Spec Sheet 06/11/2010

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