What would your "perfect speaker" sound like.

@doni 

LS3 5As have no bass below 80 Hz at 3 feet or any feet for that matter. Get a pair of KEF K92 subwoofers and a MiniDSP SHD Studio with two Benchmark DACs. This will make you a 90% system (better than 90% of the systems out there).

The best speaker/room is the one that gets you closest to the perfect one. The best is the most you can hope for with current tech. 

Since most rooms are seriously flawed this is unlikely to happen even with the finest equipment. 

You can not discuss loudspeakers without including the room, they are both part of the same transducer. The perfect speaker room would be the one that, with the best live recordings, could fool you into thinking you were at a live performance from the Melos String Quartet to Guns and Roses.