In your Discord app, open up settings>Voice&Video>check and see what your output device is set to. Make and model of your sound card? If you're working with a built in sound card on your motherboard, please mention the make and model of your motherboard and it's BIOS version.
Sig space specs can and will change over time. When that happen possible solutions and/or suggestions can end up being moo tot eh user in the same boat as you're in right now.