most accurate loudspeakers....

Most of the producers and big studios use ATC while they record and mix. For home use I believe they are toooooooo flat. No salt, no sugar, no spice. Simply flat. But professionals like ATC because they give them confidence for the final product. For ex. Pink Floyd used ATC for all their recordings and band members use ATC in their homes.

I would vote for any speaker that:

(1) Has ruler-flat frequency response, at all power levels;
(2) Is completely phase coherent, at all frequencies and at all power levels;
(3) Has a completely resistive load at all frequencies, in order to present an entirely benign load to any amplifier;
(4) Has very high sensitivity, so "detail" is not lost at low SPLs;
(5) Does not interact with the room.

Trouble is, this is impossible with current technologies. Closest you'll find is an actively biamplified line array with a DEQX.

ATC and/or PMC are anything but flat and accurate. One more myth that some clever marketing guys had manage to sell the public. If you look at the history of ATC you realize why it is popular in studios. It has nothing to do with the way they sound.

If you look at the history of ATC you realize why it is popular in studios. It has nothing to do with the way they sound.

Perhaps it is the way they look - such aesthetically elegant black boxes the likes of which few have ever seen!

Perhaps they are so heavy that they are harder to steal than the wonderful sounding Yamaha NS-10's ;-)

Perhaps, but it was mainly the fact that they can play loud and not break. You know, like typical PA speakers.