You have no items in your shopping cart.

Product was successfully added to your shopping cart.
  • QSC CMX300Va 430W Professional Power Amplifier QSC CMX300Va 430W Professional Power Amplifier
  • QSC CMX300Va 430W Professional Power Amplifier QSC CMX300Va 430W Professional Power Amplifier

QSC CMX500Va 700W Professional Power Amplifier


Rolls HA43 - 4 Output Stereo Headphone Amplifier

QSC CMX300Va 430W Professional Power Amplifier

Item #: 300494

Quick Overview

QSC CMX300Va 2c

Availability: Out of stock



The 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 QSC's 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.

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 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 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 V in the model name designates the ability to directly drive 70-volt and/or 100-volt distributed loudspeakers. The CMX 300Va and must be configured for bridged-mono operation in order to directly drive high-impedance systems

For installations requiring a transformer isolated output, the CMX has optional accessories to cover your needs.


  • “Flex-Use” loading options allow you to drivelow-impedance loads down to 2 ohms and certain models to drive 70 and 100Vdistributed loudspeaker systems
  • “Flex-Use” Input connectivity choices includingactively balanced barrier strip, XLR, or 1/4" TRS
  • “Flex-Use” Output connectivity choices include NL4Speakon™ and detachable terminal block
  • Rack mountable with chassis less than 16" or 40.6 mmdeep
  • 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 ofstereo, parallel, or bridged mode operation, and the additional choice ofenabling/disabling low frequency filter protection
  • Low-noise variable-speed fans with rear-to-front airflow keep amplifiersand racks cool


  • Stereo Mode (both channels driven)
  • 8 Ohms / FTC 20 Hz – 20 kHz/ 0.1% THD: 185W
  • 8 Ohms / EIA 1 kHz / 0.1% THD: 200 W
  • 4 Ohms / FTC 20 Hz – 20kHz / 0.1% THD: 280 W
  • 4 Ohms / EIA 1 kHz / 0.5% THD: 300 W (1% THD)
  • 2 Ohms / EIA 1 kHz / 1% THD: 430 W
  • Bridge Mono Mode
  • 8 Ohms / FTC 20 Hz – 20 kHz / 0.1% THD: 530W
  • 8 Ohms / EIA1 kHz / 0.1% THD: 600W
  • 4 Ohms / EIA 1 kHz / 1% THD: 830W
  • 70V Direct Drive / EIA 1 kHz / 1% THD: 600W
  • Frequency Response: 20 Hz – 20 kHz: ±1 dB -3 dB points: 5 Hz – 50 kHz
  • Damping Factor (1 kHz and below): > 300 at 8 Ohms
  • Input Impedance: 10k ohms unbalanced, 20k ohmsbalanced
  • Input Clipping: 10 Vrms (+22 dB)
  • Cooling: Continuously variable-speed fan,rear-to-front air flow
  • Connectors (each channel)
  • Input: Active balanced; barrier strip, XLRand 1/4" (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 ormismatched load
  • 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 – 60Hz
  • Dimensions (HWD): 3.5" 2 rack spaces x 19" rackmounting x 15.9" deep to rear support ears
  • Weight: 35 lbs

Product Tags

Use spaces to separate tags. Use single quotes (') for phrases.

  1. Be the first to review this product

Write Your Own Review

Only registered users can write reviews. Please, log in or register