I am unsure of the frequency but the scene in "Pirates of the Caribbean" when Elizabeth falls into the water and the pirate coin necklace floats out of her bodice, there is a (appropriate term?) bass "thrum" that occurs which is also displayed by a ripple in the water that the Royal Navy guys react to..."What was that...?"

The scene in LOTR - Two Towers with Golem, Sam and Frodo in the Dead Marsh when the Nazgul flies over on the dragon...it's wing manipulation has an impressive bass hit to it as well...

Although you probably know about these...

WhatFurrer

"Meddle not in the affairs of Dragons, for you are crunchy and good with ketchup..."