On 05/12/2011 07:55 PM, Marc Lavallée wrote:
Le 12 mai 2011 13:46:56, Jörn Nettingsmeier a écrit :
On 05/11/2011 03:42 AM, Marc Lavallée wrote:
I like this idea of a full-sphere bass setup. There would be 3 (small)
subs on the floor (front-left, front-right, rear-center) and one on the
ceiling (like a Z bass channel).
i doubt the Z in bass will buy you much. it might even be detrimental,
because bass sounds that fly around are often quite disturbing. i had
the problem of a floating gran cassa on hemispheric decodes (which tend
to "pull up" a bit), and it was quite irritating - somehow the ear
expects bassy sounds to be "grounded", at least for music.
but john leonard and other connaisseurs of choice aircraft engines will
likely disagree :)
If it sounds too disturbing, I suppose that I can disconnect the top subwoofer
(of a tetrahedron) and only use the three subwoofers on the floor.
Questions:
Is it acceptable if the mid-high speakers go down to 150Hz while the
subs go up to 700Hz? What would be an appropriate upper frequency limit
for the subs? How to adjust all the decoders to handle different and
overlapping frequency ranges? Is is better to avoid overlapping?
that is a can of worms. off the top of my head, i'd say don't do it and
go for a sharper transition, because you will never get the time
alignment right for a larger area.
What about small areas (3mx3m)?
wavelength = speed of sound / frequency.
plus if you've got several octaves overlap, you'd need to align the
phases over several octaves, which could be quite hard if not
impossible, depending on crossover and speaker design. plus the
alignment will only be valid at the exact center, and if you move, say,
50cm off-center, a 340hz wave will be at 180° relative to the center,
while a 170hz wave will be at 90°. so you can't really win this one.
--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT
http://stackingdwarves.net
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