Audio Breaking/Stuttering on Zoom with Coolstar SST (AVS) Audio Driver – Windows 11

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System Details

  • Device:HP Chromebook (Intel Core i7-8650U) running Windows 11 Pro
  • OS: Windows
  • Firmware Type: Full UEF
  • Firmware Version: coreboot MrChromeboox-2509.1, 13-10-2025
  • Internal storage type: eMMC

Summary of the Issue

I am using an HP Cromebook (Intel Core i7-8650U) running Windows 11 Pro. After installing the Coolstar SST Audio Driver (AVS), the speakers started working and I am able to control/balance the audio.

However, I am experiencing audio breaking/stuttering only during Zoom calls, especially when video is enabled. Check here to see the issue I’m facing.

Troubleshooting already performed:

  • Tested with multiple internet networks / ISPs

  • Issue occurs only in Zoom

  • Other applications play audio normally

  • Output format is fixed at 16-bit, 48000 Hz (CD Quality) and the option is greyed out, so it cannot be changed

My questions:

  1. Could the Coolstar SST (AVS) driver be causing compatibility issues with Zoom?

  2. Is the fixed 16-bit 48 kHz output format a known limitation that could cause audio stuttering during video calls?

  3. Is there a recommended driver version or configuration for stable audio on Windows 11 for this hardware?

Any guidance would be appreciated.

Thank you.