Horrible Sound in Bootcamp The sound on my Windows 10 bootcamp installation on my 2019 13-inch Touch Bar MBP is HORRIBLE! It sounds muted and has no bass at all volume levels. I've tried reinstalling the drivers, but it didn't help at all.
If you haven't done it yet, first check the system on the Mac side to make sure sound is normal. (great point bmike) You also don't have extra software on the Mac side modifying the default sound, do you? Like in iTunes how you can adjust the EQ settings?
Others have commented how Apple is not spending much effort adding Equalization optimizations to BootCamp. Apparently there were issues with speakers blowing out so they also adjusted the volume levels.
My recommendation is if it sounds like the issue is only occurring in Bootcamp, then you may want to provide Apple some feedback:
https://www.apple.com/feedback/bootcamp.html
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Comments regarding Windows 10 BootCamp sound differences on Reddit