QSC Audio Car Amplifier CMX300V User Guide

CMX Series  
Professional Power Amplifiers  
CMX300V | CMX500V | CMX800V | CMX2000V  
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 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  
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.  
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.  
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 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.  
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.  
CMX Power Amplifiers  
Watts per channel  
All CMX amplifiers are protected from damage from shorted outputs.  
Automatic current limiting protects the amplifier from damage until the  
short is corrected.  
2RU Models  
CMX300V  
CMX500V  
CMX800V  
8Ω  
200  
300  
500  
4Ω*  
300  
500  
800  
2**  
Bridged 4**  
830  
430  
700  
1400  
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.  
1200  
2400  
Watts per channel  
3RU Model  
CMX2000V  
8Ω  
4Ω**  
2**  
Bridged 4**  
1100  
2000  
2500  
5000  
Superior Performance  
The CMX amplifiers deliver true and accurate studio-quality sound. A  
full complementary output circuit using high-grade linear output devices  
1 kHz, 0.1% THD *1 kHz, 0.5% THD **1 kHz, 1% THD  
 

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