Speaker placement (within your room, of course). That's where the "soundstageing comes from. It also comes from the recording & mastering -- but you can't do anything about that!
Try placing yr speakers further into the room and asymmetrically to the side walls -- i.e. at an angle to their back wall.
Try placing yr speakers further into the room and asymmetrically to the side walls -- i.e. at an angle to their back wall.