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> 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 <javascript:;> > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > edit account or options, view archives and so on. > -- www.augustineleudar.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20151022/9bf8e83d/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.
