None of my three subs goes much lower than 18Hz so I can't say that I've ever felt anything that low. However the "blasts" in U-571 seem to have most of their energy (and impact) at higher frequencies. When I run this demo, at "higher than normal extended listening levels," it affects just about all parts of the body. You really do feel somewhat scrambled - just like the fictitious characters in the film would have. A check for bleeding cavities is in order!