KTC Monitor Audio Setup and Troubleshooting Guide

Use this page if your KTC monitor has no sound over HDMI or DisplayPort, built-in speakers do not play audio, headphones do not work through the monitor, or volume settings do not behave as expected.

Quick Answer

Most monitor audio problems come from the audio output being set to the wrong device, the monitor volume or mute setting, or confusion between built-in speakers and a headphone/audio-out jack. Start by confirming that the monitor model actually has the audio feature you expect, then check the source-device output selection and the monitor OSD volume settings.

How Do I Confirm Whether My Model Supports Audio?

Not every monitor includes built-in speakers. Some models only provide a 3.5 mm headphone or audio-out jack.

Before deeper troubleshooting, confirm whether your model has:

  • built-in speakers
  • a headphone jack only
  • both speaker output and headphone output
  • no audio output feature at all

If you are not sure, send support the monitor model or order number and ask them to confirm the specification.

Why Is There No Sound Over HDMI or DisplayPort?

If you need a broader reference for monitor audio controls first, see How to Raise Volume on a KTC Monitor.

Try these steps in order:

  1. Right-click the speaker icon in Windows and open sound settings.
  2. Under output device, select the monitor, HDMI audio, DP audio, or the GPU audio device.
  3. Raise the Windows volume and confirm mute is off.
  4. Open the app or game audio settings and make sure it uses the same output device.
  5. If needed, open the OSD menu and check the monitor volume and mute state.
  6. Test the other video input as a comparison if the monitor supports it.

If the monitor appears as a display but not as an audio output, reconnect the cable and update the graphics or audio driver before treating the monitor as defective.

Why Don't the Built-in Speakers Play Sound?

If your exact model has built-in speakers, test the full chain:

  1. Confirm the monitor is selected as the audio output device.
  2. Raise source-device volume.
  3. Raise monitor OSD volume.
  4. Check whether the monitor OSD has a mute setting.
  5. Test another computer or console.
  6. Test HDMI and DP as a comparison if both are available.

If display works correctly but speaker output still fails after these checks, the issue may be limited to the speaker function rather than the whole monitor.

Why Don't Headphones Work When Connected to the Monitor?

If you want a model-by-model guide for the audio jack or output path, see How to Use Headphones or Audio Out on a KTC Monitor.

Try these steps:

  1. Push the headphone plug fully into the monitor audio jack.
  2. Test another headphone or speaker set.
  3. Confirm whether the monitor has a headphone/audio-out jack rather than built-in speakers.
  4. Select the monitor as the audio output device on the computer or console.
  5. Raise both source-device volume and monitor OSD volume.
  6. Switch between HDMI and DP as a comparison if both are available.

If only one headphone or speaker set fails, the accessory may be the problem. If multiple known-good devices fail through the monitor, document the test results for support.

Why Is There No Sound When I Connect a MacBook?

  1. Confirm video works first.
  2. Open System Settings -> Sound -> Output.
  3. Select the KTC monitor, HDMI or DP output, USB-C audio device, headphones, or external speakers.
  4. Raise macOS volume and confirm mute is off.
  5. Check the app's own audio output if only one app is silent.
  6. Check monitor OSD volume and mute.
  7. If the monitor does not appear as an output option, test another cable or adapter.

Why Doesn't Changing the Volume Fix the Audio?

Audio can be controlled in more than one place. Check each layer:

  • source-device volume
  • source-device mute status
  • app or game audio output
  • monitor OSD volume
  • monitor OSD mute
  • headphone or external speaker condition

A monitor can look like the selected output device while still playing no sound because one of these volume layers is still muted.

Related basic operations

What Should I Do If the Issue Continues?

Contact support if audio still fails after trying another source device, another input, another cable path, and the correct output selection. Also contact support if the issue appears limited to a built-in speaker, headphone jack, or remote-related accessory function.

What Should I Send KTC Support?

Prepare these details before contacting support:

  • order number and purchase channel
  • monitor model
  • source device model
  • cable type and input used
  • note whether the model has built-in speakers or headphone output
  • short video showing the audio or accessory problem
  • note which output device was selected on the source device
  • list of tests already completed