Crown Audio 28M Input Volume Controls, Output Volume Controls, Output Signal Presence Indicator

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Commercial Audio Series Mixers

1 Welcome

1.2 Front Panel Controls and Indicators

A. Input Signal Presence Indicator

Green LED, one for each input channel, illuminates when input signal exceeds –24 dBu (line) or –70 dBu (mic).

B. Input Volume Controls

Microphone/line, four in 14M, eight in 28M. Detented potentiometers with knobs.

C. Output Volume Controls

One per output channel. Detented potentiometer with knob.

D. Output Signal Presence Indicator

Green LED, one for each output channel, illuminates when output signal level exceeds 100 mV.

E. Clip Indicator

Red LED, one per output channel, illuminates at threshold of audible distortion.

F. Power Indicator

Blue LED indicates power on.

G, H. Tone Controls

Bass and Treble non-detented potentiometers on each input channel. Bass ±10 dB at 100 Hz, Treble ±10 dB at 10 kHz.

I. Power Switch

Pushbutton on-off switch. The power switch does not affect the 24V DC auxiliary power input (letter “K” on next page).

Figure 1.1 Front Panel Controls and Indicators

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Operation Manual

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Contents Commercial Audio Series Some models may be exported under the name AmcronImportant Safety Instructions Watch for These SymbolsCrown International, Inc Safety StandardDeclaration of Conformity European Representative’s Name and AddressTable of Contents Features WelcomeOutput Signal Presence Indicator Input Volume ControlsOutput Volume Controls Clip IndicatorMic/line Switch Back Panel Controls and Connectors AC Power InletMixer Config Switch Dual RCA Input ConnectorHow to Attach Rack Ears SetupInstallation Locate the two rack ears suppliedBalanced Line WireYour System Typical input and output wiring is shown in FigureOutputs Maintain proper polarity +/- on output connectors Phantom Power Input RoutingPriority Muting Powering Up Included AccessoriesBlock Diagram 28M Block DiagramTroubleshooting No input signal Input signal level is very lowSpecifications Service Warranty United States & CanadaItems Excluded from this CROWN- Warranty Worldwide Except USA & CanadaFax Model Serial #Crown Audio, Inc Mishawaka RdThis page Intentionally Left Blank Crown Audio Factory Service Information Product Return InformationCommercial Audio Series Mixers Commercial Audio Series Mixers
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