Circa 1999 I had a 27" picture tube tv mounted in a cabinet (GE I think). Whenever I put (e.g.) a football game on I could distinctly hear the higher frequency components of crowd noise coming from spots far outside the span of the tv set with its usual pair of small front-firing speakers. I marveled at it and wondered how to replicate the psychoacoustics. Several years later the picture went bad, and I found to my dismay that the replacement tv (same type, size, mounting etc. but a different brand) did not produce the effect. I had expected that whether the effect was from the old tv or from some acoustic anomaly related to its mounting position in the room, I would hear the same thing. I never did, nor have I heard it again with the flatscreens that have since replaced the old beasts.