QSC Audio CX168 Appendix Multiple Speaker Loads in Series, Multiple Lo-Z Loads in Series

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APPENDIX: MULTIPLE SPEAKER LOADS IN SERIES

Multiple Lo-Z Loads in Series:

Series connection is where the same signal current flows through each of the speaker loads. The signal goes into one terminal of the first speaker and out its other terminal; then the signal goes into one terminal of the next load, and so on. If any of the speakers in a series-connected branch of a system fails, the signal is prevented from flowing through any of the loads (no sound). Total impedance for series connections is the sum of each of the impedances in the chain (see illustration, below).

Series connection schemes are usually used with “raw” speakers (not often with speaker cabinets) for wiring conve- nience. The exposed speaker connections make this method easy for small “strings” of speakers in one area. Most PA-type

speaker cabinets are NOT wired for series connection ability; consult your speaker’s documentation for connection information.

It is not recommended to connect speakers of different imped- ances in series because power will be divided unequally between them. If you are experienced with mixing and matching speaker loads of varying impedances, no damage to the amplifier will result as long as the total impedance is within 4 to 16 ohms per stereo/parallel channel or 8 to 16 ohms, bridged.

Below are examples of series connections for 2, 4, 8, and 16 ohm speaker loads. Series connections resulting in an impedance of 250 ohms or greater are not recommended.

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Contents CX168 Important Safety Precautions Explanation of Symbols FCC Interference StatementTable of Contents Introduction Front Panel Front Panel with Security PlateRear Panel Dimensions Mounting Points Rack Mounting Installation Unpacking & Rack MountingWhat is Included Supporting the Rear of the AmplifierAC Mains Connection Installation Cooling & AC Mains RequirementsFan Cooling Setup Setting the Mode Configuration DIP Switches SetupSetup Setting the Mode STEREO, PARALLEL, or Bridge ModesLow Frequency Filter Setup Mode Switches Clip Limiter and LOW Frequency FiltersClip Limiter Low Frequency Filtering Tips Frequency Response CurvesConnections INPUTS- Using the Terminal Block Inputs Connections INPUTS- Using the DataPorts Connections Outputs Stereo and Parallel ModeBridge Mode OutputsConnections OUTPUTS- Using the Terminal Block Connectors Terminal Block ConnectionsOperation Power Switch and Gain Controls Power SwitchOperation LED Indicators LED IndicatorsOperation Gain Controls Gain ControlsOperation Gain Control Security Plate Gain Control Security PlateUsing the DataPort Operation Using the QSC Dataport ConnectionsDataPort Connectors General Guidelines to using the DataPorts on the CX168 What Can I Connect to the DataPort?Applications Typical Application Examples Four Room Stereo FeedOFF Appendix Description of Stereo & Parallel Operating Modes Stereo ModeParallel Mode Appendix Description of Bridge Operating Mode Normal Operating LevelsAppendix Multiple Speaker Loads in Series Multiple Lo-Z Loads in SeriesAppendix Multiple Speaker Loads in Parallel Multiple Lo-Z Loads in ParallelTroubleshooting no Sound Problem no SoundProblem Hiss SPECIFICATIONSCX168 Output Power in wattsSpecifications CX168Disclaimer Warranty Information & HOW to Contact QSCProduct Warranty Page Page
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