The recording is probably the most important followed by the speakers and their placement.
My speakers are 7.5 feet apart center-to-center, but the Rhodes fills the entire "front of the house" (26 feet), and then some. Some on the JBL forum have said they even experience a wrap-around.
If you can’t get a really WIDE soundstage, way beyond the speakers, on the Rhodes on this cut, fergitaboutit.