Will a good subWOOFer reproduce this? I have never had a use for one although having a useable component stereo system since around 1983. I might have a very good use for it now and my neighbors should appreciate it as well but probably wont. Just like most all the records I play for them.(?)
Yup, a decent sub will reproduce a 40hz sound wave.
Just use your iPhone as a 40 hz frequency generator and connect it to your sound system.
You really feel it more than hear it.