This was originally going to be a question but as I was working on this
email I actually stumbled into the solution, so I thought I’d share that
instead in case others experience this. I just got a new logitech H870e
headset and was getting an echo or reverb like sound when using it with
NVDA. Initially I thought it was just with NVDA but the same thing happened
with narrator, and then I pulled up a YouTube video and lo and behold,
actually all the audio coming through the headset exhibited this echo.

Long story short, you go to Control panel, hardware and sound, click sound,
right click on the audio device exhibiting the issue, go to the advanced tab
of the dialogue that pops up and uncheck the option “enable audio
enhancements,”hit apply then OK. For me, this immediately removed the echo.
Hope this helps somebody