Quote Originally Posted by ken88
I recently came across some ads boasting about 3D sound? Does such thing exist or just a marketing ploy? I am not aware of any good speaker manufacturers coming out with 3D sound and this makes me suspicious of the claim. If 3D sound does truly exist, how does it sound different compared to the conventional sound? What does it take to make 3D sound, if it is true? If 3D sound is"invented" some day, does that mean all existing speakers, including high-end ones are obsolete? Thanks for all comments.
I don't know about "3D sound". However, if you have your system and speakers set up properly you should have a reasonable soundstage. A sound stage is three dimensional. It has depth to go along with a left right spread. A good soundstage will usually be wider than the speakers positions. A very good one will also have some height cues. All good soundstages will also extend beyond the wall behind the speakers.

In other words a good soundstage is wider deeper and can be higher than the room the speakers are in. I think that qualifies as 3D.

To answer your question, 3D sound is a marketing ploy and "Bovine Feces"!