Maplegrove, without a doubt, panel speakers are the best for holography; that's because they're "dipole". While this is true, they lack a certain "solidity"; I have the best of both worlds, mine are custom speakers that combine a heil airmotion transformer, which is dipole, with a 6 inch and a 12 inch driver.
A crossover engineer was required to get this to work. I don't recommend it, nor would I ever do it again, because it has taken years of fine tuning to get it just right for my ears, but that's the price for a trip to paradise. (if I had to replace them, it would be with panel speakers)
Do you remember the "Amazing Carver" speakers? I liked them too.
Happy listening, and Happy New Year.