I remember a while back, i popped into a hifi dealer in liverpool (better hi-fi) and had a listen in the demo room.

On demo was a SME deck, loads of linn amps, and some mahoosive, 3 sided, TDL loudspeakers.

The 3d soundstage was remarkable.loads of height, width and depth.This spread far beyond the boundaries of the room.

In fact i felt as though i could have walked around in it, it was that believable.

The speakers where around 7 foot into the room, and this obviously helped.

So, you can get width, height AND depth, and plenty of it.

just a matter of proper setting up and positioning, and also the dimensions of the room (which i feel is the most important).