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  • Check your physical connections. (3.5mm audio jack plugged into the laptop when using VGA for video, HDMI carries both audio and video)

    Image RemovedImage Removed


    Image ot a VGA connector and a 3.5mm headphone connector. Image AddedImage of a HDMI cable connector. Image Added

  • Check your selected input on either the SmartBox or Extron controller. (HDMI, VGA, Computer, etc. should match the cable(s) that you have connected)

    Image Removed


    Image showing the Main Controls page of an Extron Touch Panel classroom AV system controller. Image Modified

  • When using a classroom with a SmartBox, look on the lower left corner of the SmartBox and check the amplifier emergency-power-off switch. It should be turned ON (The position shown). 

    Image showing the classroom audio amplifier for a standard classroom with specific emphasis placed on the power button that the faculty always shut off when they shouldn't. Image Modified



  • Check your sound settings on your laptop.

    • On a Windows 10 laptop, click the Speaker Icon in the taskbar and choose the appropriate audio output. 

      Audio over HDMI Connections with appear as Extron HDMI, ExtronScalerD, or the model number of the installed NEC Projector in the room. (NEC Model Number shown)

      image showing the windows 10 interface for audio output selection and volume control. Image Modified



      Analog Audio connections when using VGA appear as shown below. 

      image showing the windows 10 interface for audio output selection and volume control. Image Modified


    • On a Windows 11 laptop, click the Speaker Icon in the taskbar, then click the audio output selection button next to the volume slider, and choose the appropriate audio output. 

      Audio over HDMI Connections with appear as Extron HDMI, ExtronScalerD, or the model number of the installed NEC Projector in the room. (NEC Model Number shown)

      image showing the windows 11 button for audio output selection and volume control. Image Added


      image showing the windows 11 interface for audio output selection and volume control. Image Added

       Analog Audio connections when using VGA appear as shown below. 

      image showing the windows 11 interface for audio output selection and volume control. Image Added



    • On a MacOS laptop, click the control center icon in the upper right corner of the taskbar and choose the appropriate audio output. 

      Audio over HDMI Connections with appear as Extron HDMI, ExtronScalerD, or the model number of the installed NEC Projector in the room.

      Image Removed


      image showing the MacOS interface for audio output selection and volume control. Image Added



      Analog Audio connections when using VGA appear as shown below.

      Image Removed


      image showing the MacOS interface for audio output selection for headphonesImage Added



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Chris Sandefer Brian Bucar

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