Sound Stage is defined (in my own words) as: The ability for a sound system (headphones, speakers, etc) to create the sense, or illusion, that different instruments are placed around you at different angles and different distances. Essentially, a sound stage allows a user to visualize the location of certain sounds in a given recording.
Terms used with sound stage that describes it:
- Width: Your left to right is the width of the sound stage.
- Height: Your up and down is the height of the sound stage.
- Forward/backward: Your front and back is this part of the sound stage.
Your in the sound science section, so I'm going to give you my ideas on how it actually works. Please note that these ideas are 100% accurate, they are just generalizations based on every pair of headphones I've ever put on (from IEMs, to actual headphones, to earbuds). I believe that it is based on the actual frequency curve of the sound system. As you know, the way we actually determine distance is through the
loudness of something. So if a certain frequency is softer than another on a pair of headphones, it'll create the illusion that it is further away. What also seems to follow is that most headphones that have really great sound stage are not neutral or flat (normally are never close to it either). To add, it seems that on just about every headphone that I've heard have sound stage, it almost always had a V/U shaped curve to it. This allows layering in the mid-range which makes some things sound really close, and some others really far. Again, this isn't 100% concrete.