Contractor "Flex-Use" Specific Features:
"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
QSC's CMX Series amplifiers use 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's output section features class AB architecture.
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.
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 2RU chassis. Unlike other designs, CMX output devices are directly mounted to the heat sink for optimum thermal coupling and cooling. All 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 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.
Stereo Mode Ratings (Both Channels Driven):
- FTC 20 Hz - 20kHz, 0.1% THD: 185W
- EIA 1 kHz, 0.1% THD: 200W
- FTC 20 Hz - 20kHz, 0.1% THD: 280W
- EIA 1 kHz, 0.5% THD: 300W (1% THD)
- EIA 1 kHz, 1% THD: 430W
Bridged Mono Mode Ratings/Specifications:
- FTC 20 Hz - 20kHz, 0.1% THD: 530W
- EIA 1 kHz, 0.1% THD: 600W
- EIA 1 kHz, 1% THD: 830W
70V Direct Drive:
- EIA 1 kHz, 1% THD: 600W
Signal to Noise, 20Hz-20kHz, 0.1% THD, 8 Ohms: > -100dB
Input Sensitivity @ 8 Ohms: 1.15V (+3.4 dBu)
Voltage Gain @ 8 Ohms: 31.6x (30 dB)
Output Circuitry: Class AB
Power Requirements (120V):
- 1/8 power pink noise at 4 ohms: 4.4A
- 1/3 power pink noise at 4 ohms: 6.6A
Power Requirements (230V):
- 1/8 power pink noise at 4 ohms: 2.2A
- 1/3 power pink noise at 4 ohms: 3.3A
Distortion (SMPTE-IM): <0.02%
- 20 Hz - 20 kHz: 10 dB below rated power: Less than 0.03% THD, 4 and 8 ohms
- 1.0 kHz and below: full rated power: 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'
- Front: AC switch, Ch. 1 and Ch. 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
Power Requirements: 100, 120, 230 VAC, 50-60 Hz
Dimensions: 3.5" H (2RU) x 19" W x 15.9" D (to rear support ears) (8.9 x 48.3 x 40 cm)
Net Weight: 35 lbs (15.9 kg)
Shipping Weight: 41 lbs (18.6 kg)