But the phase cancellation is only a problem if, in fact, you're playing multichannel mono - if you're (spatially) decoding to your array, the problem doesn't exist (see Bill Martens "The Impact of Decorrelated Low-Frequency Reproduction on Auditory Spatial Imagery: Are Two Subwoofers Better Than One? http://www.aes.org/e-lib/browse.cfm?elib=8048 )
Dr. Peter Lennox Senior Lecturer in Perception College of Arts University of Derby, UK e: p.len...@derby.ac.uk t: 01332 593155 -----Original Message----- From: Sursound [mailto:sursound-boun...@music.vt.edu] On Behalf Of Jonathan Burton Sent: 23 April 2015 09:02 To: rica...@justnet.com.au; Surround Sound discussion group Subject: Re: [Sursound] ENVELOP - 3D Sound, on Kickstarter.com - SUB frequency range My interest is as yours musical. Spectragraphs of frequency show significant energy at 20Hz and below in most forms of music. As soon as Percussion is introduced the level becomes significant. Mono reproduction of sub has many practical benefits in that it reduces the amount of phase cancellation that occurs with multiple speakers which in my profession is a major concern. It would be great to work with more surround sound/ambisonic material but with large audience this becomes impractical. Thanks for the reply though. Jon On Thursday, April 23, 2015, Richard Lee <rica...@justnet.com.au> wrote: > There is an important reason to maintain full Ambisonic capability to > below 20Hz. > > It is a MUSICAL one. > > Go to a service at a large cathedral with good organ. At the end of > the service, the organist will play something to show off while > everyone is leaving. You can walk around and listen at various > positions without causing offense. > > On SOME pedal notes at SOME positions, you will experience 'pressure > in the head' sensations .. on other notes and positions the experience > is 'trouser flapping' .... Pressure & Velocity nodes in cathedral > space > > A mono recording or single "high quality Sub" converts the pleasant > 'trouser flapping' to unpleasant 'pressure in the head'. > > You need at least stereo, preferably at least 4 subs in a classic Ambi > system (and a TetraMic recording) to reproduce these important aspects > of an organ performance. This isn't about LF 'localisation'. It's > about pleasant musical sounds. > > If the desired effect is Bruce Willis blowing up the universe, > dinosaur footsteps or modern music (??), your single "high quality > Sub" is sufficient. You can also achieve the same effect by having > someone stand behind you wielding a blunt instrument at the appropriate > moment. > _______________________________________________ > 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. > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20150423/986908e3/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. The University of Derby has a published policy regarding email and reserves the right to monitor email traffic. If you believe this was sent to you in error, please select unsubscribe. Unsubscribe and Security information contact: info...@derby.ac.uk For all FOI requests please contact: f...@derby.ac.uk All other Contacts are at http://www.derby.ac.uk/its/contacts/ _______________________________________________ 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.
