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This guide will help you adjust WiiM settings to eliminate pop noise for a smoother audio experience.


Issue Description

 

Pop noise may occur when WiiM devices (e.g., WiiM Mini, WiiM Pro, WiiM Pro Plus, and WiiM Ultra) output digital audio signal to certain external DACs, amplifiers, or speakers via the Optical Out or Coax Out interface. 


The pop noise issues typically arise due to the following reasons:

  • Sudden changes in audio signal levels at the start or end of playback.

  • Improper handling of sample rate changes by the connected external devices.


Solutions


Solution 1: Enable Fade-In and Fade-Out Settings


Enable Fade-In and Fade-Out settings to reduce sudden changes in the audio signal levels:

  1. Open the WiiM Home app.

  2. Go to the Devices tab.

  3. Tap the Device Settings iconof your WiiM device.

  4. Select Audio Settings.

  5. Enable Fade-In & Fade-Out Effects.


Solution 2: Adjust Sample Rate Switch Latency


Adjust sample rate switch latency to give external devices time to adapt to sample rate changes and prevent noise：

  1. Open the WiiM Home app.

  2. Go to the Devices tab.

  3. Tap the Device Settings iconof your WiiM device.

  4. Select Audio Output.

  5. Select the digital audio output (Optical Out or COAX Out) and the try to adjust Sample Rate Switch Latency for your external device.


Solution 3: Use a Fixed Sample Rate


Resample all audio to a fixed rate to avoid sample rate switching and the resulting pop noise:

  1. Open the WiiM Home app.

  2. Go to the Devices tab.

  3. Tap the Device Settings iconof your WiiM device.

  4. Navigate to Audio Settings.

  5. Set a fixed sample rate for Optical Out or COAX Out:
  • For Optical Out: Select SPDIF Output Resolution and enable Fixed Resolution.

  • For COAX Out: Select Coax Output Resolution and enable Fixed Resolution.


By following this guide, you can effectively address pop noise issues when using WiiM devices with digital audio outputs.