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bass,sub,woofer,flyaway,hair nice subwoofer!
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http://www.videosift.com/video/My-Eye-Just-Popped-Out
Damage to your (inner) ear occurs when enough energy is transferred to your hair cells, causing them to break.
A loud low sound like in this video has a low frequency (pitch) and a high amplitude (volume). As sound is just a displacement of air, at low enough frequencies with high amplitude it would basically just be a gust of wind (as you can clearly see).
The energy in a wave depends on its frequency and amplitude, imagine the hairs just swaying about 1 time per second..no big deal.
15000 times per second however, all the while swaying just as far, the stress would cause them to break.
High-energetic waves have the potential to do more damage, just think of visible light ("low" frequency) and x-rays (high frequency). Even ultraviolet light, which is just beyond the visible light in frequency, can cause skin cancer.
A low sound that blows your hair about won't damage your inner ear.
Lower sounds could theoretically kill the hairs but your eardrum would sooner rupture..ouch?
The basic rule probably should be, if it hurts turn down your volume down to about 30% of that volume : S long term higher frequency exposure is a bitch.
(if you look though, the back window is flexing easily 1/4 inch out... no one can tell you that's not bad for your hearing...)