Doorstop you say?? ;-) On 21 October 2015 at 17:30, Augustine Leudar <augustineleu...@gmail.com> wrote:
> Daw ☺damn you autocorrect. > > On Thursday, 22 October 2015, Augustine Leudar <augustineleu...@gmail.com> > wrote: > > > You should also look at the Behringer x32 - 32 channels, midas preamps, > > motorised faders, proven reliability, works as a usb multichannel > > soundcard and door controller. 1000 pounds. > > > > On Tuesday, 20 October 2015, Michael Chapman <s...@mchapman.com > > <javascript:_e(%7B%7D,'cvml','s...@mchapman.com');>> wrote: > > > >> Fons Adriaensen wrote (Thu, October 15, 2015 6:47 pm) : > >> > On Thu, Oct 15, 2015 at 03:59:46PM +0200, Jörn Nettingsmeier wrote: > >> > > >> >> We've seen all those outlandish claims of magical waveguides that > >> >> are just fractions of the wavelength in diameter and yet shape the > >> >> sound so wonderfully that a 20Hz beam will travel all the way to the > >> >> moon (using the revolutionary VacuProof™ technology that will > >> >> finally bring cinema-friendly space battles). The problem is, this > >> >> waveshaping is not physically possible. > >> > > >> > Yes, it's a simple as that - not physically possible. > >> > > >> > If you think in ambisonic (spherical harmonic) terms it's > >> > easy to see why. Orders zero and one correspond to physical > >> > quantities, pressure and velocity, so these can be generated > >> > directly at any point. Higher order SH can't. > >> > > >> > Which means that you can have cardioid subs, or even > >> > supercardioid ones, but anything expected to create more > >> > directional beams will need to be of a size comparable > >> > to wavelenght. > >> > > >> > Can be (and is) done for open-air PA systems using very big > >> > arrays. But not in any normal room, there simply isn't the > >> > space to do it. > >> > > >> > >> There's something I've missed here ... for several years (as Feynman > >> commented <https://www.youtube.com/watch?v=hTRVlUT665U> there's a point > >> when it's too late to ask idiot questions, but here goes;-)> : > >> > >> If X,Y,Z correspond to velocity > >> then does W correspond to some displacement of (a notional membrane say > >> in) the aether in Jorn's vacuum of space;-)> > >> > >> If so ... by extension (always dangerous) ... then don't the next five > >> (second order) components relate to acceleration ? > >> > >> > >> To rephrase the question with no idiot presumptions: > >> Why, in ambisonics, do we repeatedly refer to velcocity but never > >> acceleration? > >> (If one exists, then so must the other.) > >> > >> > >> I feel an idiot even asking, so harsh replies accepted ;-)> > >> > >> Michael > >> > >> > >> > >> > >> > >> > >> > >> _______________________________________________ > >> Sursound mailing list > >> Sursound@music.vt.edu > >> https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > >> edit account or options, view archives and so on. > >> > > > > > > -- > > www.augustineleudar.com > > > > > > -- > www.augustineleudar.com > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://mail.music.vt.edu/mailman/private/sursound/attachments/20151022/52b67514/attachment.html > > > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > edit account or options, view archives and so on. > -- * Charlie Richmond - http://www.RichmondSoundDesign.com <http://www.richmondsounddesign.com/> * Viber: +16047159441 Skype, LinkedIn & Twitter: charlierichmond * facebook: charlie.richmond * facebook.com/pages/Richmond-Sound-Design-Ltd/130195960832 <https://www.facebook.com/pages/Richmond-Sound-Design-Ltd/130195960832> * google.com/+CharlieRichmond google.com/+Richmondsounddesign -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20151021/cbf514af/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
