3-Dimensional Soundstage

     What edcyn, williewonka and erik_squires said, +1 each.

     Symmetry of your overall system (channel balance, both electronic and room acoustic), quality of components, purity of signal transfer (there are those cables, again) and time alignment of all speaker drivers, all are critical in the reproduction of a recorded sound space.

      While some depth is manufactured/manipulated by electronics; well engineered/mic'd live sound can and will present an original recording venue's depth of field.

      One of the main tricks in enjoying that: reproducing the event at a level close to the original recording's.

       Having said all that; whenever a question arises, regarding sound stage and imaging; I suggest the following tests, by which one may determine whether their system actually images, or reproduces a sound stage, as recorded:

      On the Chesky sampler/test CD; David explains in detail, his position on the stage and distance from the mics, as he strikes a tambourine(Depth Test). 

      The LEDR test tells what to expect, if your system performs well, before each segment.

         Online test: https://www.audiocheck.net/audiotests_ledr.php

         Chesky CD: https://www.ebay.com/p/4046056409

          and, a good article: http://www.stereophile.com/features/772/

                                             Happy listening!

btw: 

     The tests that I referenced are scientifically designed to eliminate all variables, as far as the source/recording.

      If your system reproduces the effects, as recorded and announced/described prior to play; your system will reproduce whatever soundstage and imaging your media contains.

      If not: well...

    To quote Bobby Owsinksi from his book:  The Mastering Engineer's Handbook, 4th Edition:

"The LEDR test is a substitute for about $30,000 to $40,000 worth of test equipment."