macOS Sierra Update 10.12.4 Stuttering Audio

Yesterday I ran the 10.12.4 update in the morning. The install was pretty routine and upon completion, I noticed an immediate problem.

I use a Plantronics Audio .478 USB headset with my iMac. The audio to my headset constantly stuttered. I tested iTunes, YouTube, as well as Slack phone calls -- all audio had the same effect -- constant stuttering. I tried bypassing my USB hub and plugged it directly into my iMac, but the problem persisted. I reset my NVRAM, but the problem persisted.

Audio coming out of the internal speakers was find. I plugged in another headset to test and the problem did not persist. This lead me to believe that the my Plantronics headset was bad, so I replaced it with the same make and model (because I liked it). The problem persisted with the new Plantronics headset.

My last resort was to do a system restore back to 10.12.3. After that was complete, the audio no longer stuttered.

So what could possibly have been introduced in 10.12.4 to cause audio issues with this exact model headset?