I just brought my car in and they addressed another service advisory that sounds related to this one:
Job: 2 TSC-B0824-001-01 Lower A-Pillar Speaker Distortion
Cause: The fabric tape covering the body holes in the lower A-pillar region is susceptible to vibration and flutter, acting as an unintended diaphragm and
reducing audio quality.
Corrections: Removed the fabric tape from both lower A-pillar body holes and replaced it with a butyl damping tape patch. Verified no distortion.
I didn't ask them to do that, they did it proactively. Might be because I had this problem with the woofer previously. Has anyone else had this job done on their car?