QSC CMX Series Amplifiers – Proven, Reliable Power Plants

The QSC CMX series – including the CMX300V, CMX500V, CMX800V, and the CMX2000V – offers an economical and rugged power amplifier solution 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 amplifiers are designed to deliver true and accurate sound performance and feature high-current toroidal transformers and filtering to ensure generous energy reserves allowing the amplifiers to effortlessly handle high-level transients, even when driving abusive 2-ohm speaker loads.  The CMX series is the perfect amplifier for gymnasiums, retail stores, houses of worship, club venues, and more.

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 1/4″ 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

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.

Shop for Power Amplifiers

Ideal System Solution Examples:

 

Preliminary Specifications

SPECIFICATIONS
CMX300V CMX500V CMX800V CMX2000V
STEREO MODE (Both Channels Driven)
8 ohms
FTC 20 Hz – 20 kHz, 0.1% THD
EIA 1 kHz, 0.1% THD
185 W
200 W
260 W
300 W
450 W
500 W
1050 W
1100 W
4 ohms
FTC 20 Hz – 20 kHz, 0.1% THD
EIA 1 kHz, 0.5% THD
280 W
300 W
400 W
500 W
650 W
800 W
1600 W
2000 W (1% THD)
2 ohms
EIA 1 kHz, 1% THD
430 W 700 W 1200 W 2500 W
70V Direct Drive
EIA 1 kHz , 1% THD
- - 400 W 2500 W
100V Direct Drive
EIA 1 kHz , 1% THD
- - - 1000 W
BRIDGE MONO MODE
8 ohms
FTC 20 Hz – 20 kHz, 0.1% THD
EIA 1 kHz, 0.1% THD
530 W
600 W
800 W
900 W
1300 W
1500 W
3200 W
3600 W
4 ohms
EIA 1 kHz, 1% THD
830 W 1400 W 2400 W 5000 W
70V Direct Drive
EIA 1 kHz , 1% THD
600 W 1200 W 2000 W 5000 W
100V Direct Drive
EIA 1 kHz , 1% THD
- 600 W 2300 W 3600 W
Signal to Noise, 20 Hz-20 kHz, 8 ohms > -100 dB > -100 dB > -100 dB > -100 dB
Input Sensitivity @ 8 ohms 1.15V (+3.4 dBu) 1.15V (+3.4 dBu) 1.23V (+4.0 dBu) 1.42V (+5.3 dBu)
Voltage Gain @ 8 ohms 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 (120V)
1/8 power pink noise at 4 ohms
1/3 power pink noise at 4 ohms
4.4A
6.6A
5.4A
9.6A
6.3A
15.6A
13.9A
26.9A
Power Requirements (230V)
1/8 power pink noise at 4 ohms
1/3 power pink noise at 4 ohms
2.2A
3.3A
2.7A
4.8A
3.2A
7.8A
7A
13.5A
Distortion (SMPTE-IM) < 0.02% < 0.01% < 0.01% < 0.01%
ALL MODELS
Distortion (Typical)
20 Hz – 20 kHz: 10 dB below rated power
1.0 kHz and below: full rated power
Less than 0.03% THD, 4 and 8 ohms
Less than 0.03% THD, 4 and 8 ohms
Damping Factor, 1 kHz and below Greater than 300 at 8 ohms
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 1/4″ (6.3mm)
TRS tip and XLR (pin 2 positive)
Output: detachable terminal block and Neutrik™ Speakon™
Controls Front: AC switch, Ch. 1 and Ch. 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 (CMX300V, CMX500V), triac crowbar (CMX800V, CMX2000V, on each channel)
Power Requirements 100, 120, 230 VAC, 50-60 Hz
Dimensions (HWD)
2RU Models 

3RU Model (CMX2000V)

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 lbs (15.9 kg) 40 lbs (18.2 kg) 44.5 lbs (20.2 kg) 75 lbs (33.1 kg)
Weight – Shipping 41 lbs (18.6 kg) 46 lbs (20.9 kg) 50.5 lbs (23 kg) 87 lbs (37.2 kg)

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