On 03/06/2011 01:04, Marc Lavallée wrote:
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.
I suspect you are just modulating the standing wave pattern..
Here is the 'uncut' version, if you would like to compare. I think it is
less suitable for general use, so don't want it to be the offical
distributed version. You seem to be the only one interested. The file
will be removed in a day.
http://dl.dropbox.com/u/20268768/DW3_no_Xover_L.wav
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