why 3D Holographic sound


HI, guys, my question is, why I'experience thru holographic sound when standindg in front of my speakers obout 7' away and not as much when sitting in my chair about same distance, does it have something to do with speaker placement, or what,trying to find the reason why this is happening, dont' like to stand when playing my music, any sugestions will be apreciated. regards:
juancgenao
3 dimensionality has to do with reproducing the sound waves while retaining the phasing of the live performance. Wall/cieling,floor,reflections will fill in and confuse the compressions and rareractions, and ruin the 3 -D effect.
Do you have a headrest or is your head unobstructed from the back when seated? I find a headrest interferes with imaging and depth, though seems to increase perceived bass.

Regards,
Will