I realise this thread has been dead for six months. But i totally agree with Hpshps about the Audio Physic Caldera. The imaging is holographic not just on vocals, but on anything from the midrange up. Add any Audio Physic sub-woofer & the holographics are full-range.
Speakers that have holographic imaging on vocals..
As far as 3-d imaging on vocals...I found only a handful...namely Spendors,Vandersteens,and older Spica tc-50s that I used to own capable of doing this...and this includes auditioning Maggies,Thiels,Revels,Logans, and too many more to mention...any thoughts?