How important is it for you to attain a holographic image?

Yeti, I know it's possible to have a very wide "sweet spot", but very expensive; I don't have it, mine is the same as yours.

Fleschler, probably none of our systems are identical, and yours can do things mine wont do.

yeti42  It helps to widen the sweet spot if you turn your speakers inward so the axis' crosses in front of your head when you are in the sweet spot. 

Woke up this morning to a track that was three dimensional (Gershwin 2nd Rhapsody, Tilson-Thomas, L.A. Phil.). Maybe my hearing got more acute, or my system suddenly improved. I have been experimenting with seating positions lately.
Anyway, although not essential, it’s nice to have.
BTW, My system does have a very wide “sweet spot.”

I have a 1.5 person wide sweet spot and a wide, 5 total seat good listening area between the speakers which are set apart 9 feet center to center, angled about 5 to 7 degrees inward and 13 feet in front of the seating.  They cross far to the rear of the center seat.  I use two pair of Shakti Hallographs and 32 Synergistic Research HFTs to focus the sound and expand the soundstage.  My speakers are called Focus but they don't really do well without the help to focus the sound.  The Signature IIIs focus much better.