It may well be that what you are looking for does not exist. If your definition of accurate is nearfield listening at moderate SPLs or listening through worldclass headphones, all bets are off. First, nearfield or headphone listening essentially tries to eliminate the room from the equation as much as possible. Second, the behaviour of speakers does not typically scale linearly. Different drivers of a speakers may start to compress at different SPLs, for example, which will alter the sound depending on SPL, or an otherwise excellent amplifier may have trouble delivering the required amount of current fest enough to faithfully reproduce the dynamics of a musical event (and it may not even be amp that is at fault if it starving for power from the wall).
On the other hand, if you definition of accurate is reproduction of musical events with realistic SPLs, sound stage in three dimensions, emotional impact, "suspension of disbelief" for more than mere microseconds etc. there are systems capable of doing just that. Whether a symphonic orchestra at full crescendo can be reproduced accurately is another question. I deliberately used the word system, not speakers, in my above claim. Putting all the burden on the speakers is not fair. Obviously, you have to start with a set of speakers that is capable of producing what you are looking for but then you have to go all the way with proper room tuning, choice of electronics, cables, power, vibration control (which gains in relative importance the higher your SPLs) etc.
I am speaking from experience with the very speakers that I own (Avalon Eidolons). Depending on how they are fed, they are capable of producing accurate auditorium size portraits or simply be loud and unconvincing. I guess that the same will be true with many other speakers.
