First the soundstage and imageing on most recordings is totally artificial. It is added during the mixdown. The correct size of the soundstage is very difficult to determine. You would have to start by knowing what's on the recording. In my old listening room, on some recordings it went in width from about 1-1/2 feet out side of each speaker (About 10 feet between speakers), in depth from about 2 feet in front of the speakers to about 5 feet behind, in height from ceilling to floor (Dunlavy's all give a high soundstage). The room has a LOT to do with the soundstage and imageing. From my experience, good soundstage and images are found in equipment with high accuracy and excellent detail.
