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.
(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.