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The thinking behind the so called X-curve

opto, muokattu 6 Vuodet sitten.

The thinking behind the so called X-curve

Padawan Viestejä: 31 Liittymispäivä: 10.5.2009 Viimeisimmät viestit

Ilkka explained in another reply to another question, as a side-line-info, that unlike in studios, where the response is required to be flat, in large cinema-rooms (up to several hundred people) the response is calibrated to follow the so called X-curve :

The "logic" of that curve is very difficult for me to understand in an intuitive manner, because my intuitive thinking is saying that if the loudspeakers in a very large cinema-room behind an attenuating perforated screen, are far away from the last row spectators, so that there is a) the screen and b) the distance and c) room-attenuation (from a large crowd of people and perhaps even a soft acoustics of the room itself), then WHY does there have to be any electronic attenuation of high frequencies IN ADDITION to the a) , b) and c) ???

I am myself using the X-curve at home, where the speakers are 2 meters away, in a rather live acoustics, in a small room, and the balance is fantastic to my ears (listening TV, music, radio, . . .anything) !! (No screen)

But I just cant see the "light of it" in cinema-rooms (see above). Although it does't annoy me eather (actually it is very easy on the ears !)

Sometimes I thought that it was meant to calibrate the optical perspective and the acoustical perspective together, but then I read somewhere that the X-curve is the X-curve, because the professional re-recording mixers on behalf of Ray Dolby just desided that " it works the way it is ". Well, for me at least, it does , but not in cinema, but home-sweet-home !

Do you know the scientific room-acoustical rationale for it ??