So, this is really random, but if you can open up the case and figure out what is whining, folding up tinfoil neatly in half about a dozen times will make a really effective shield and cut like 95% of the whine. I found out about this trick from an open-source synth (PreenFM 2, incredible little frequency modulation synth) that had some whine due to the display. Sticking the thick piece of tinfoil between the display and the PCB boosted the SNR an almost unbelievable amount. Give it a shot, it only costs time and tinfoil! Be sure to stick some electrical tape around anything it might contact though, so you don't short anything out.

I've had my ts3 for a couple years now. I just noticed a pretty bad coil whine on mine lately. I'm not sure if it's always been there and my environment's changed or the device just suddenly started making the noise.

I usually can detect coil whines to an annoying degree, but I don't hear one in my TS3 Plus. Maybe your ears are more sensitive than mine!

Coil whine is about the only time having tinnitus works in my favor.

I have two 3x4k display Startech hubs, and one developed a very audible coil whine, the other did not. It was so bad it landed in a drawer.

Otherwise both worked fine allowing me to drive 3 screens on the OG M1 mbp. They each cost around 350 eur though.

That sounds like exactly the issue I've just described when I plug a USB C display into mine. I actually notice it, albeit to a much lesser degree, when I move a USB mouse connected to the dock.

Probably time for a change I guess.

I hear nothing from mine, but this may well be an example of me being 52.