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)? > 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. At home I'd have the time to ajust it (if required). -- Marc _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
