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Contents User Guide This page intentionally left blank Table of Contents Issue 1, September Model 233 User Guide System Overview IntroductionWhat This User Guide Covers Main Output System FeaturesMicrophone Input Talkback FunctionsFlexibility User Controls and Status IndicatorsDynamic Range Control Cue Sources SidetoneHeadphone Output Audio Quality and Protection Power SourcesIntercom Interface Auxiliary RelayAdditional Connector Locations ConfigurationConnectors Multi-Pin Headset ConnectorsSystem Components Installation and SetupOptions Headphone Output Line-Level Talkback Outputs Line Inputs External Power Input Configuration Pushbutton LabelingMicrophone Preamplifier Gain and Phantom Power Microphone Preamplifier GainPhantom Power On/Off Headphone Source SelectionLeft and right channel headphone source selection settings Headphone Output Mode Headphone output mode settingsMain Output Button Mode Operating ModesTalkback 1 Button Function Talkback 1 Button ModeTalkback 2 Button Mode Main Output Source Sidetone ModeTalkback 2 Button Function Headphone Output Operating Modes Dual-Channel or Stereo ModeReverse Left/Right Mode Minimum Level Mode Main Button ModeRelay Mode System ModeOperation Talkback 1 to Intercom Function ModeTalkback 2 to Intercom Function Mode ConclusionMain Output Button Modes Pushbutton Switches and Status LEDsMain Output Button and LED Indicators Talkback 1 Button Modes Talkback 1 Button and LED IndicatorTalkback 2 Button and LED Indicator Talkback Output 2 Button ModesLevel/Level Mode Level/Balance ModeMonaural Headphone Output Level Control Operation Sidetone OperationAdjusting the Line Input Trim Pots Advanced OperationGrounding and Shielding Intercom Interface Sidetone AdjustmentTechnical Notes Intercom Channel Crosstalk Intercom Audio LevelsConnecting an IFB Circuit Phantom Power External Power SourcesSymptoms of Insufficient Power Travel Case Additional ConnectorsLED Colors Issue 1, September Model 233 User Guide Pushbutton Backlighting Remote Control/Tally Connections P18Compressor Circuit P19Specifications General AudioAppendix a