CMXa Series amplifiers represent an economical and rugged power amplifier solution for installed sound applications. There are four CMXa models to choose from (CMX 300Va, CMX 500Va, CMX 800Va, and CMX 2000Va). The CMX amplifiers provide flexible input and output connectors making them ideal for use in projects such as performance halls, houses of worship, sport clubs, gymnasiums, dance venues, pubs, and FGM/BGM systems. The CMXa Series provides unmatched performance and user options at an affordable price point.

CMX300Va Features

  • “Flex-Use” loading options allows CMX Series amps to drive low-impedance loads down to 2 ohms, and certain models can direct-drive (no output transformer) 70V 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" (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 enabling/disabling low-frequency filter protection
  • Low-noise variable-speed fans with rear-to-front airflow help keep amplifiers and racks cool
  CMX300Va CMX500Va CMX800Va CMX2000Va
Stereo Mode (both channels driven) 8Ω FTC 0.1% THD 8Ω EIA 0.1% THD 4Ω FTC 0.1% THD 4Ω EIA 0.5% THD 2Ω EIA 1% THD 70V Direct EIA 1% THD 100V Direct EIA 1% THD FTC: 20 Hz–20 kHz after preconditioning EIA: 1 kHz 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* 2500 W 2500 W 1000 W  
Bridge Mono Mode 8Ω FTC, 0.1% THD 8Ω EIA, 0.1% THD 4Ω EIA, 1% THD 70V Direct Drive EIA, 1% THD 100V Direct Drive EIA, 1% THD FTC: 20 Hz–20 kHz after preconditioning; both channels driven simultaneously EIA: 1 kHz 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 5000W 5000 W 3600 W  
Signal to Noise (20 Hz–20 kHz, 8Ω) > 100 dB
Input Sensitivity into 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)
Max Voltage Gain 31.6× (30 dB) 40× (32 dB) 46× (33 dB) 64× (36 dB)
Output Circuitry Class AB Class AB 2-tier Class H 3-tier Class H
Current Draw (pink noise program) Typical, 1/8 power 4Ω, 120 V Typical, 1/8 power 4Ω, 230 V Severe, 1/3 power 4Ω, 120 V Severe, 1/3 power 4Ω, 230 V 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-IM) < 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 and 50 kHz
Damping Factor (1 kHz and below) > 300 at 8Ω
Input Impedance 10 kΩ unbalanced, 20 kΩ balanced
Input Clipping 10 V rms (+22 dBu)
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, Channels 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 or 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)
List price: $678.00
Price: $678.00
SKU: cmx300va
Catalog: 
Commercial Amplifiers
Brand: 
QSC Audio
Dimensions: 25 in × 22 in × 6 in
Weight: 36 lb