Here's a little bad press regarding the Shakti Holograms in this thread:
"Shakti's 1200 to 1700 for a few pieces of wood? Yeah, right."
I have two pairs of the Holograms ... one pair in the corners of the room behind the speakers and another pair spread out behind the listening position. Yes, not only are they made of wood, but cheaply built and flimsy too. BUT, I would challenge anyone to come over while I move them in and out of the system and deny that they don't make a VERY significant difference. I wouldn't want to listen without them.