Thank you for the responses.
The sounds I hear are crackles and pops, they increase in volume as I increase the volume.
What I have is a set of older Bose speakers (5.1) connected to an old receiver. 100% analog R/W connections in and out.
So, I have analog R/W from the TV to the receiver. Since I do not hear the crackles/pops when playing audio that is sourced the HDMI, but still out to the receiver via analog R/W, that may or may not help diagnose everything.
Additionally, I think we can rule the receiver out of this, b/c I hear the crackles and pops when playing over the TV speakers. It also happens regardless of which R/W AV inputs I am using.