Neubilder, I'd be one of those! So far the most accurate speakers I have heard are 98 db 1 watt 1 meter. They go from 20Hz to 40KHz and have the same transparency and detail of the best ESLs but dynamic range no ESL or magnetic planar can hope for.
Additionally, amplifier power can be expensive compared to speaker efficiency. If you want realistic volume levels, it can take a prodigious amount of power to cleanly reproduce volumes of +105db without strain and distortion with speakers that are 90 db or less- assuming that the speaker can even play that loud without artifacts of its own. IMO/IME any speaker that requires more than a 200 watt amplifier is just plain impractical.
Additionally, amplifier power can be expensive compared to speaker efficiency. If you want realistic volume levels, it can take a prodigious amount of power to cleanly reproduce volumes of +105db without strain and distortion with speakers that are 90 db or less- assuming that the speaker can even play that loud without artifacts of its own. IMO/IME any speaker that requires more than a 200 watt amplifier is just plain impractical.