...and not just to what kind of bass is on stage.
Visual signals impact what we hear, which is why it's harder to hear over the phone or some of you older TB members can't hear the TV without your glasses.
It's called the McGurk effect. It's interesting that it applies more to speech than to music, but it's cool nevertheless. http://auditoryneuroscience.com/McGurkEffect
Posting this from my Linguistics lecture because I think it's that cool.