Features
• Threemodelsthatrangeinpowerfrom170wattsto450wattsperchannel
• Compactsize–allmodelsonly2RUand14"deepforreducedrackcostandfloorspace
• Channels1&2and3&4bridgeableformaximumflexibility
• ActiveInrushLimitingeliminatesACinrushcurrent,removingtheneedforexpensive
powersequencers
• HD15DataPortconnectorforQSControlcomputercontrol
• Customintegratedsecuritycoverfortamper-proofinstallations
• Variablespeedfanforlownoise
• 1dBdetentedgaincontrolsforfastandaccurategainsettings
• DetachableEuro-styleinputconnectors
• DIPswitchcontrolforcliplimiters,high-passfilters,bridge-monoandparalleloperation
• ExclusivePowerLightswitch-modepowersupplytechnologyforhighperformanceand
compactsize
• Selectablehigh-passfiltersprotectspeakersandpreventspeakertransformersaturation
withminimaleffectonprogrammaterial(33Hzor75HzonCX254andCX404,50Hzor
75HzonCX204V)
• Comprehensivefrontpanelindicatorsincludingsignal,clip,protectandQSC’sexclusive
bridge-monoandparallelinputLEDs
• Barrierstripoutputconnector
• ComprehensiveprotectioncircuitryincludingDC,infrasonic,thermaloverloadandshort
circuitprotection
• High-performanceClassAB+Bcomplementarybipolaroutputcircuitry
• Lightweight–allmodelsonly21pounds(9.5kg)foreasierrackingandshipping
• 3-yearwarrantyplusoptional3-yearextendedservicecontract
The  4-channel  CX  amplifiers  give  you  four 
channels  in  only  two  rack  spaces,  without 
compromising on power. Choose from three 
models, a direct 70 volt model and two low- 
impedance versions. Each model is equipped 
with  exclusive  QSC  PowerLight™  switching 
power supply technology to virtually eliminate 
noise  and  hum.    With  high-output  power, 
versatile loading options, high-thermal capacity 
and unmatched reliability, the CX Series is the 
perfect solution to any permanently installed 
sound system. 
 CX  4-channel
ProfessionalPowerAmplifiers
CX 4-channel Amplifiers 
            Watts per channel 
Model  70V  8Ω 4Ω 2Ω
CX254  −  170  250  450*
CX404  −  250  400**  −
CX204V  200  −  −  −
20 Hz – 20 kHz, 0.05% THD   
*
1 kHz, 1% THD
 
**
1 kHz, 0.1% THD
 CX254 | CX404 | CX204V
All models include an 
integrated security cover for 
tamper-proof installations