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QSC CMX500Va 2 Channel Power Amplifier
Part # CMX500Va
Model # CMX 500Va
The CMX 500Va 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.

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The CMX 500Va feature set is 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 500Va provides unmatched performance, the right power for the job and an affordable price point.

Proven and Reliable Power Plant

CMX 500Va amplifier 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 500Va 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.

CMX 500Va amplifier is protected from damage from shorted outputs. Automatic current limiting protects the amplifier from damage until the short is corrected. CMX 500Va amplifier also feature DC protection systems to prevent loudspeaker damage inthe 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 500Va amplifier delivers 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.


  • “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.
Stereo Mode
8Ω / FTC 20 Hz – 20 kHz / 0.1% THD 260 W
8Ω / EIA 1 kHz / 0.1% THD 300 W
4Ω / FTC 20 Hz – 20 kHz / 0.1% THD 400 W
4Ω / EIA 1 kHz / 0.5% THD 500 W
2Ω / EIA 1 kHz / 1% THD 700 W
Bridge-Mono Mode
8Ω / FTC 20 Hz – 20 kHz / 0.1% THD 800 W
8Ω / EIA 1 kHz / 0.1% THD 900 W
4Ω / EIA 1 kHz / 1% THD 1400 W
70V Direct Drive / EIA 1 kHz / 1% THD 1200 W
100V Direct Drive / EIA 1 kHz / 1% THD 600 W
Signal to Noise (20 Hz – 20 kHz, 8Ω) > - 100 dB
Input Sensitivity at 8Ω 1.14 V (+3.4 dBu)
Voltage Gain at 8Ω 40 x (32 dB)
Output Circuitry Class AB
Power Requirements
Typical, 1/8 power pink noise at 4Ω, 120 VAC 5.4 A
Typical, 1/8 power pink noise at 4Ω, 230 VAC 2.7 A
Severe, 1/3 power pink noise at 4Ω, 120 VAC 9.6 A
Severe, 1/3 power pink noise at 4ΩΩ, 230 VAC 4.8 A
Distortion (SMPTE-M) < 0.01%
Distortion (typical)
20 Hz – 20 kHz: 10 dB below rated power < 0.03% THD / 4Ω and 8Ω
1.0 kHz and below: full-rated power < 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™
Front AC switch, Ch. 1 & 2 gain knobs
Rear 10-position DIP switch
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)
Load Protection Triac crowbar (CMX 800Va and CMX 2000Vaon each channel)
Power Requirements 120 and 230 VAC, 50 – 60 Hz
Dimensions (HWD)
2 RU models 3.5" H x 19" x 15.9" D with rack mounting (89 mm x 483 mm x 404 mm)
Net Weight 40 lbs (18.2 kg)
Shipping Weight 46 lbs (20.9 kg)

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