Le Thu, 2 Jun 2011 14:27:24 -0700 (PDT), Ralph Glasgal <rglas...@yahoo.com> a écrit :
> Obviously there is no reason not to use subwoofers with RACE, Wareing, > or Choueiri. But those filters were designed to work with full range speakers, so unless the mains are on top of the subs I suppose it is better not to use the filters with subs that are apart from the mains. > I think we are splitting hairs here. On the contrary, it's very interesting! > It is > incontroverible that the human ability to localize declines with > frequency. Based on the Bose experiments and other AES papers > written too long ago to remember, 90 Hz is where localization begins > to become difficult. This is very hard to verify because all > subwoofers have harmonic distortion and one localizes to that. Also > in the early days, and even now apparently, the crossovers were not > steep enough to prevent some energy over 90 Hz from reaching the > subwoofers. I am sure somebody did it before Bose, but as far as I > know he was the first to make a completly passive crossover network > steep enough to allow the subwoofers to remain unlocalizable to > anybody except Fons. I did a basic experiment with twos subs and a sound generation software (PureData with the equal_power_pan extension). I panned a bass sine tone from left to right and back, changing the frequency between 40Hz and 160Hz. I was able to localize the sine tone at certain frequencies, depending on my position in the room; at 70Hz the tone was very easy to localize. So it's definitely possible to create a sound field with directional bass, intentionally or not. -- Marc _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
