I have different speakers of course, but I have found the most profound effect on soundstage is to set up the speakers according to the manufacturers recommendation. You should follow the manufacturers setup guide to a T, using a measuring tape and a level.
Other items, see the immedia setup guide mentioned above. Also, try to get stuff like extra furniture out of the room. Make sure you don't have anything (like a tv) in between them and try to minimize reflective surfaces such as coffee tables, and walls. For corners, I put some big plants in the rear corners of my room and that helped. I also have some curtains that cover the glass wall behind my speakers. Closing these does improve the soundstage.
If you want to buy something, I would try replacing the monster cables. I'm flag waving my own equipment yet again, but nordosts are known for as soundstaging champs. I'm hearing very good things about the Analyis plus cables. Tube equipment tends to increase the size of the soundstage as well.
Other items, see the immedia setup guide mentioned above. Also, try to get stuff like extra furniture out of the room. Make sure you don't have anything (like a tv) in between them and try to minimize reflective surfaces such as coffee tables, and walls. For corners, I put some big plants in the rear corners of my room and that helped. I also have some curtains that cover the glass wall behind my speakers. Closing these does improve the soundstage.
If you want to buy something, I would try replacing the monster cables. I'm flag waving my own equipment yet again, but nordosts are known for as soundstaging champs. I'm hearing very good things about the Analyis plus cables. Tube equipment tends to increase the size of the soundstage as well.