^ Your document was released in 1979, remember? Anyway, check the K100 brochure and see why they decided to give up on orthos. I am not impressed by the T50RP to the least and it's pretty obvious that the larger the diameter of an ortho driver the "thicker" and more life-like it will sound IME. There's a good reason why the latest russian orthos are 80mm IMO.
7/1/15 at 6:03am