There's a thread going on in the Klipsch Forum about frequency responses of loudspeakers and our hearing threshold. Someone posted this link in the thread where you can test your hearing. It's not very scientific, but I've tried it and I'm surprised that I can just hear the 16Hz tone. It's all those years of using hearing protection, I guess...
http://www.phys.unsw.edu.au/jw/hearing.html
http://www.phys.unsw.edu.au/jw/hearing.html