QSC Audio CX168 user manual Low Frequency Filtering Tips, Frequency Response Curves

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SETUP: MODE SWITCHES: CLIP LIMITER AND LOW FREQUENCY FILTERS

Low Frequency Filtering Tips:

•The OFF position should be used only for subwoofer systems with rated frequency response below 33 Hz. or if low frequency filtering is provided by other devices.

•Know the specification of the speaker cabinet you are driving. Match the low frequency roll off setting to the specified low frequency capability of the speaker cabinet. Do not drive the speaker with frequencies below its rating.

•Unless you have low frequency filtering before the amplifier, use the low frequency filter to protect your loudspeakers from cone over-excursion caused by frequencies below the speaker’s limits.

•The 33 Hz. rolloff is a good “all purpose” setting. Turn the filter on by setting the appropriate DIP switch to ON position and select 33 Hz. using its 33/70 Hz. DIP switch. This setting is a good starting point for most large, full-range cabinets.

•The 70 Hz. rolloff is a good setting to use with smaller, compact speaker cabinets having limited bass capability. Turn the filter ON and select the 70 Hz. setting when using smaller cabinets.

•The frequency selection ( 33 or 70 Hertz) has no effect unless the filter is set to the ON position.

Frequency Response Curves

off

Filter

.

Hz

70

ON,

Filter

.

Hz

33

ON,

Filter

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Contents CX168 FCC Interference Statement Important Safety Precautions Explanation of SymbolsTable of Contents Front Panel Front Panel with Security Plate IntroductionRear Panel Dimensions Mounting Points Supporting the Rear of the Amplifier Installation Unpacking & Rack MountingWhat is Included Rack MountingAC Mains Connection Installation Cooling & AC Mains RequirementsFan Cooling Setup Setup Setting the Mode Configuration DIP SwitchesModes Setup Setting the Mode STEREO, PARALLEL, or BridgeLow Frequency Filter Setup Mode Switches Clip Limiter and LOW Frequency FiltersClip Limiter Frequency Response Curves Low Frequency Filtering TipsConnections INPUTS- Using the Terminal Block Inputs Connections INPUTS- Using the DataPorts Outputs Stereo and Parallel ModeBridge Mode Connections OutputsTerminal Block Connections Connections OUTPUTS- Using the Terminal Block ConnectorsPower Switch Operation Power Switch and Gain ControlsLED Indicators Operation LED IndicatorsGain Controls Operation Gain ControlsGain Control Security Plate Operation Gain Control Security PlateUsing the DataPort Operation Using the QSC Dataport ConnectionsDataPort Connectors What Can I Connect to the DataPort? General Guidelines to using the DataPorts on the CX168Four Room Stereo Feed Applications Typical Application ExamplesOFF Appendix Description of Stereo & Parallel Operating Modes Stereo ModeParallel Mode Normal Operating Levels Appendix Description of Bridge Operating ModeMultiple Lo-Z Loads in Series Appendix Multiple Speaker Loads in SeriesMultiple Lo-Z Loads in Parallel Appendix Multiple Speaker Loads in ParallelProblem no Sound Troubleshooting no SoundProblem Hiss Output Power in watts SPECIFICATIONSCX168CX168 SpecificationsDisclaimer Warranty Information & HOW to Contact QSCProduct Warranty Page Page