I have a fairly basic 2 speaker - 1 sub setup for my PC and today when I got in from work and started playing a video over them a rumbling sound began coming from the sub.
I paused the video, the rumbling continued in a random manner.
Unplugged the audio cable, the rumbling still occurs.
Turn the bass setting to lowest possible settings. Nope.
Unplug/replug and reseat power connectors. Still rumbles after a bit.
Could the sub be preparing to kick the bucket and drop some hot beats in the afterlife?