Creating a Large Sound Stage

Recording, room acoustics, speakers, electronics, cables. In this order, provided you have decent electronics and speakers. 

Don't forget that speaker placement also has a lot to do with good sound stage.

Just about every audio related variable you can name will come into play here.

It would help greatly if you add photos of your room and list equipment in a Audiogon Virtual System. 

lack of strong direct reflections, diffusion between them, excellent bass. 

Diffusion to the sides is also usually a good idea. It's preferred to pure absorbers in some cases, especially for imaging.