Realtime Analyzer ENA is the most advanced version of the RA series. It has all of the functions of the other products in the series. It is different, however, from the Diagnostic System for Sound Fields. The differences in specifications of the Diagnostic System for Sound Fields and the current RAE are: One advantage is that, with Diagnostic System for Sound Fields, functions can be added one-by-one. That is to say, the right to add functions at a later time can be purchased. For example, the following can be updated on line. Yo hear the impulse response sound by pressing the "Play" button in the impulse response measurement screen.