Mine got down to 10, could probably hear it at 5, but neighbors are still in bed recovering from the 4th

If you have a good system, this will rattle your windows around 80 if you have the volume up.

[YOUTUBE]igGroIcga3g[/YOUTUBE]

 

Not to pick nits, but it's unlikely that you "heard" 10 Hz. Human auditory range drops off dramatically below 20 Hz. More likely, you either felt it or you heard hiss from your speakers.

 

Felt it then.
I have some pretty impressive PC speakers, same ones I use for my TV in the other room too.

http://reviews.cnet.com/pc-speakers/...-20720043.html
It says it goes down to 35, but I could hear it at 20, and just feel it at 10.
Nothing at all on 5.