Thanks everyone for the information! Using four subs was mentioned a couple of times. I've never used or experienced more than two in an array. What is the justification? I assume that given a square room, you'd place one in each corner?
Also - a good point was made regarding the cost effectiveness of using 32 channels in total, i.e: 28.4, instead of 32.2. As a point of reference, this is the space where I'm hoping to install the new speakers: http://www.iaia.edu/wp-content/uploads/2011/07/Bach_01.2011.2_sm.jpg The image shows our 24' diameter hemispherical projection surface. Perhaps digital dome theaters are particularly suited for Ambisonics given the spherical shape and the obvious shortcomings of 5.1 in this space. The video standard is a 'domemaster', a square video with a circular mask. Theaters must decode the domemaster to 'n' projectors. I would love to see domemaster videos shipped with an Ambisonics track, so that the sound could be decoded to 'n' speakers. On Thu, Oct 15, 2015 at 8:08 AM, Jörn Nettingsmeier < netti...@stackingdwarves.net> wrote: > On 10/15/2015 03:59 PM, Jörn Nettingsmeier wrote: > >> On 10/15/2015 03:41 PM, Augustine Leudar wrote: >> >>> What can I say Jorn - we have some and they work - not as well as >>> adverstised obviously but strip away the hype they have something thta >>> mor >>> eor less does as described - you'll have to wait a while for those >>> measurements ;) >>> >> >> For now, the low cutoff frequency would be enough. >> >> Mind you, I'm not saying that these things cannot be great creative >> tools. But I'm a sound engineer. I need to deal with the artistic output >> of other people, in such a way that they are not going to ram the >> speakers down my throat because half of the spectrum is missing. I need >> general-purpose speakers, which on a bad day means ten octaves and 110dB >> peak SPL. >> >> 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. You can make a plane wave, but unless it's a huge >> plane wave with respect to frequency, the edge dispersion will make it >> fall apart. In the end, it's just a point source with a little dent in >> it. I don't even need to wait for measurements. >> >> Even if you consider ultrasonic systems: at some point, the ultrasound >> has to be demodulated (it is actually demodulated _everywhere_ in the >> beam), and then you again have a frequency-dependent radiation pattern. >> So yes, some years in the future maybe we have an ultrasonic projector >> that is actually capable of putting a kick drum right in the middle of >> the room without frying anything in its path. But as soon as the >> baseband sound materializes, it will be (almost) omnidirectional again. >> >> >> > Here's an interesting datapoint: > > http://www.ultrasonic-audio.com/images/Acouspade_vs_Audio_Spotlight.png > > Consider the Acouspade, to the right. The polar pattern is truly nice, > unless you look at the fact that we are not told what happens below 500 Hz > (because very likely, nothing much is happening there), and we take note of > the tiny, tiny dotted line that denotes 4 kHz, which is down by around 18 > dB on-axis, indicating that in the treble range, not much is happening > either. > > This is a wonderful tool if you want to whisper textual information at > your visitor. But what you are actually perceiving is your amazing ability > to suspend disbelief in the presence of a friendly voice from your own > species. > > > -- > Jörn Nettingsmeier > Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487 > > Meister für Veranstaltungstechnik (Bühne/Studio) > Tonmeister VDT > > http://stackingdwarves.net > > _______________________________________________ > 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. > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20151015/27cfa2e4/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.
