Your equipment is fine, no need to replace anything. The key to obtaining a proper soundstage is to sit in the near field (no further away than the distance between the speakers) and to acoustically treat the floor and wall reflections. With a friend use a mirror to visually see where the first reflection points are and then experiment with different acoustic treatments. A word of caution, I owned a pair of S100 for about 18 months. Overall, I thought they were very good to excellent speakers, but the thing they didn't do very well was soundstage. I suspect the wide speaker baffle may be the culprit. Also, most music does not have the beyond the speaker effect, so make sure what you're using as a reference truly has this property. Good luck!
Widening my soundstage
I can't seem to get my Spendor S-100s to soundstage any wider than the speakers themselves. They're off all walls. Been toed in, toed out, placed on axis, moved, tilted, turned, twisted... Powered by Jolida int. tube amp. Arcam CD. Cardis interconnects. Speaker cables = weakest link = heavy gauge Monster cable copper. Could that be it? Suggested repacements????