Glad you got your experiment to do what you wanted.
Just a side note, the numbers I’ve seen for the AM modules only go down to 46hz. Definitely not in the feel it more than hear it range. And definitely not like a 12 or 15” subwoofer.
Have fun!
Checks whether audible Harmonic Distortion is present in the lowest frequency range of your audio equipment.
www.audiocheck.net
I found this link with a tool that allow to play various frequencies and I did test what you're pretending.
Nothing at all below 20hz, I barely notice something at 24hz but at 28hz I clearly hear and feel it but yes, it's a bit distorted, 32hz is clear and shake the house and all other frequencies were clear without any distortion. So again, I don't want to prove anything but have you ever been in a room with a properly tuned Bose Accoustimass 15 serie 3 or 16 serie 2? There have been so much versions for so long and so many haters everywhere that I do believe there's not much valuable and available real numbers for these systems.
While at it, I used these tool to further experiment and test:
Give your subwoofer a kick (or two... or six).
www.audiocheck.net
I can clearly hear and feel the various depths of Kick 1 70hz to Kick 6 20hz.
I have however a lot of parasitic sounds in my living room, the wooden floor, the fireplace and deco accessories are reacting to those tests and sometime it's bad... However with a movie or with music, it's not distracting too much.
I love it!!!
Using the various tools in this website, I can now argue that my setup goes easy down to 20hz, maybe a tad lower depending on what the sound is!!! Very cool!