She doesn't seem to mind it all that much with most of the music I play, but when I was playing Medeski, Martin & Wood's Uninvisible the other day, she got the nervous shakes when Retirement Song (track 6) came on. It contains copious amounts of deep bass. She snuck off the couch and hid in the bedroom until I was finished.
I can explain it to you but I can't understand it for you.