+1 - I have a 3+ SOTA system and just love it! To adjust my EQ on the touchscreen, I ripped this Disc and use the Chromatic scale to balance out the frequency response -
Rooms | Stereophile.com The sweep starts out at 32.7hz and the bass response is perfect with my setup. I'm sure it extends easily below 20Hz with my setup (but I haven't tested it with any frequency sweep material) and with the control that Reus provides on the side of the drivers seat to control the bass response, you can easily adjust your bass response on the fly as the quality of your source material changes.
I have noticed that over time, as Tesla has pushed out firmware updates, I've had to change the EQ on the touchscreen to keep my overall frequency response smooth. The frequencey sweep referenced in the link above has worked out great to help me do that and I feel like the firmware updates have improved both the stock audio system as well as my Reus system.