Thiel Owners

Ryun - I expect you will find good subwoofer advice here. I am not a subwoofer expert, but I have an idea about the nausea you are experiencing.

Researchers have developed Infrasonic Weapons which operate in the 2-4 Hz range which cause nausea to the point of debilitation and death. I suspect you might have an ultra low frequency leak either going into or generated by your subwoofer. If you have a low-cut / high-pass filter, set it around 10 Hz and see if the problem goes away.You can see such low frequencies as cone motion, even though you don't hear them.

That’s a really interesting idea! Unfortunately there is only a high-pass filter so I can’t experiment with that.

Thank you!

Unfortunately there is only a high-pass filter so I can’t experiment with that.

Have you tried the experiment of unplugging the subwoofer? The Stereophile review of the CS2 points out that the 42Hz extension is adequate for most rock music. And your system making you nauseous is pretty much the opposite of enjoying your favorite music.
https://www.stereophile.com/floorloudspeakers/1085thiel/index.html

I have definitely unplugged it for now! I can consider keeping it without a sub. But I did notice something lacking while watching a movie the other night. Any sci fi movie with a deep music track will make me want more bass. I also listen to hip hop and trap music. Those sound really great and clean without the sub, but there is a something missing. And even orchestral music, which is the main thing I listen to, sometimes feels like it could benefit from a little bit of something at the bass end. Maybe a smaller or less powerful subwoofer would do the job better?

A room that is 30' will have a resonance at 37.5 hz I think.  (speed of sound is 1,125 ft/sec, 1,125ft/37.5 = 30 so a 37.5hz wave has length 30')  It might be that by extending your response just a little bit below that of the main speakers you're exciting that node a whole lot more.  I have a similar situation in a big open family room/dining room area.  I've found that by equalizing the peaks down 3-4db the problem becomes much less audible.  Too large of a cut and the frequency response is technically better but sounds worse to me.