Can anyone tell me how to determine the age of a set of Klipschorns from the serial #'s ? And what differences/improvements have been made since that year ?? What about woods/finishes available back then ?? I am looking for a set of speakers to place in a room 40' x 40' , hard wood floors, Tongue & groove wood walls , a great deal of glass, and a peak ceiling height of approx. 33 feet . Speakers will be placed in the corners,,,,,,Are Horns the best choice for a " Room full of sound " ??