Dear JQ I made a series of installations for seaside “shelters” where the listeners sat very close to the speakers. I used three speakers, attached to the amplifier as L, L+R, R so the mixing of the C channel was done “in the speaker” as it were. Then I took a stereo mix of the sound to be presented and reduced the centre channel amplitude using an MS matrix by (as far as I remember) about 6dB. So, in playback the outer channels ended up having more S and the centre ended up more or less as the M channel would be. This was all because the audio had to run from a car CD player (and batteries)
and it worked pretty well. if you were sitting in the middle the outer speakers were at about 120 degrees. hope this helps, Justin Justin Bennett jus...@justinbennett.nl www.justinbennett.nl http://jubilee-art.org/ > Message: 1 > Date: Tue, 8 Apr 2014 18:45:03 +0200 > From: JQ Adams <jqad...@google.com> > To: sursound@music.vt.edu > Subject: [Sursound] MS output to 3 loudspeakers > Message-ID: > <CACJjVkLyj8AHSkgx4Vz1-x5DESR=jf4h9ogx8ao7ptttavh...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Greetings. > > I am familiar with mid-side and Blumlein figure-of-eight recording > techniques, as well as how to matrix the signals to transform between them. > For playback, usually I see a transformation into stereo. > > However, I have a strong need for a center mono channel much of the time > (video conferencing). From listening tests I have concluded that one > centered loudspeaker above the video display sounds better throughout the > conference room than dual mono from loudspeakers mounted to the sides of > the display. > > My question pertains to play back to a three speaker setup (left, center, > right)...would it be most correct to send the 'mid' signal directly to a > center speaker and the 'side' signal to speakers left and right, phase > inverted from each other? > > Note, at this time I have a two channels transmission limit on my system, > so B-format is not an option presently. > > Thanks for any thoughts on this. I have enjoyed many threads on this list. > > Regards, > JQ _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
