The stuttering seems to be gone now, so I didn't run the Latency Monitor.

Thanks for your assistance so far.

It's hard to say if this is new or not, because this is the first time a 5.1 speaker setup has been plugged in to the PC. I did some more testing this morning,...

Standard analog speakers. 5.1 surround Center/Front/Side/Sub

Configuration is correct and all speakers play great in configuration test. This leads me to believe to hardware is fine.

Pretty...

Speaker Setup plays all speakers fine
Applications do not play any bass through subwoofer (or really, at all)
Custom built PC using Gigabyte 990FXA-UD3 motherboard onboard audio.
Windows 10...