Classroom Audio Troubleshooting

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Physical Connections

  • Use a 3.5mm audio jack plugged into the laptop when using VGA for video. HDMI cables carry both audio and video signals automatically.

Here is a list of items to review when audio is not working in a classroom when trying to present.

Table of Contents

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

Selected Inputs

  • Check either the SmartBox or Extron controller. The selected input (HDMI, VGA, Computer, etc.) should match the physical cable(s) you have connected to your device. Image showing the Main Controls page of an Extron Touch Panel classroom AV system controller.

SmartBox

  • When using a classroom equipped with a SmartBox, locate the lower left corner of the SmartBox and check the amplifier emergency-power-off switch. It must be turned to the ON position.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.

Sound Settings on Your Laptop

Windows 10

  • Click the Speaker Icon in the taskbar and choose the appropriate audio output.
  • Audio over HDMI connections will appear as Extron HDMI, ExtronScalerD, or the specific model number of the installed NEC Projector in the room.

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

  • Analog audio connections (when utilizing a VGA cable) will appear as your laptop's standard analog output.

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

Windows 11

  • Click the Speaker Icon in the taskbar, then click the audio output selection button (represented by an arrow) next to the volume slider, and choose the appropriate audio output.
  • Audio over HDMI connections will appear as Extron HDMI, ExtronScalerD, or the model number of the installed NEC Projector in the room.                   

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

  • Analog audio connections (when utilizing a VGA cable) will appear as your standard analog headphone/line-out device.

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

MacOS

  • Click the Control Center icon in the upper right corner of the menu bar, click on Sound, and select the appropriate audio output.
  • Audio over HDMI connections will appear as Extron HDMI, ExtronScalerD, or the model number of the installed NEC Projector in the room. 

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

  • Analog audio connections (when utilizing a VGA cable) will appear as your standard external headphones/line-out port.      image showing the MacOS interface for audio output selection for headphones

Microphone Troubleshooting

For wireless and lapel microphone issues, please refer to the detailed guide on Classroom Technology & Microphone Troubleshooting.

 

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Details

Details

Article ID: 1730
Created
Wed 6/3/26 3:02 PM
Modified
Wed 7/15/26 4:25 PM

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Classroom Technology Support
If equipment in a classroom is malfunctioning or damaged, please use this form to report the issue.