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When driving could hear a new kind of light rumble or vibration sound throughout the car that was not the usual car sounds. Hard to locate it in any one spot from inside. Noticeable on highway speeds if I recall correctly and noticeable when driving around 40-50mph steadily on back roads. Some might miss the sound, but I could tell it was not usual. The sound would only change with rolling speed change, not if I changed gear, etc. 100% tying it to the speed of something. Similarly, no issues with wobble test of the wheels.
Ultimately, I replaced both of my rear wheel bearing assemblies and the sound went away so it seems like that was what the issue was.
Side note, a couple years prior, a Subaru dealer 'service' center (which damaged my car in another way as well), come to find out also had tightened one of my lugs so hard that I had to get a new one when I was getting the wheel bearing assemblies replaced at a different service center this time, and that (memory's a bit fuzzy now on this) may have begun to damage my rotors in some way. I also got the rotors replaced at the same time as getting my wheel bearing assemblies changed. Not sure if either of those were related, but I recall all the research and testing I and the technicians did pointing to the wheel bearing assemblies being the main issue causing the sound.
When I lifted the car up and hand spun the wheels, the suspect wheel had a wss wss wss sound and a 'knocking' sound maybe like a muted / softer sound like what you hear in a paint spray can when shaking it / the mixing ball.
I have some videos of all this, but my old YouTube account for this stuff is lost to me so I couldn't upload it.
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