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 :)
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. experience with PA systems shows that a smooth phase transition between basses and tops is quite worth the effort. so if you don't have a chance to get it right, then at least limit the effect to an octave or so. with a transition from 150 to 700, you basically leave the entire low-mid response to chance. and see if you can measure the overall system phase response and align it with some delay.
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