Hi Aaron
Thanks for your response.
What I meant by 'angle errors', was that if the speakers are placed in a
different part of the room that was structurally different, the sound waves
would not be the same as the any of the others (due to reflection/absorbs-ion
phase errors altering frequency/transient response). This can be improved
through dsp, but it is never as good as getting it right at source. Maybe
'angle errors' was not the correct term.
Stanford's CCRMA room does look (and undoubtably sound) good, but the space
below is maybe a bit over board for what I want to achieve, in the space I
have. The actual area of the build space is probably around 180 square foot
within a bigger space of 700 square foot on two floors. It does have high
ceiling though, with an apex over 4 metres (6.8 metres from ground floor to
apex). This does dictate to a certain extent the shape of the room, as the room
will be built on a mezzanine above the ground floor. This means the 'front'
already slopes down to1.80 metres, rising to the back 4.5 vertical wall (that
meets the apex). A box could still be constructed though, ignoring the slopes,
but as I mentioned earlier this would actually be beneficial in front dominant
mixing. I will probably go for a raised listening position to achieve more down
positions, although to get a fully central head position standing may be
required.
I will be very interested in your forth coming paper on partial coverage
speaker arrays, as to date I have only used the platonic solids, or only
horizontal decodes.
Cheers
Steve
Message: 10
Date: Sat, 8 Mar 2014 20:26:17 -0800
From: Aaron Heller hel...@ai.sri.com
To: Surround Sound discussion group sursound@music.vt.edu
Subject: Re: [Sursound] Construction of purpose built ambisonic
studio.
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CA+MMR5BuP=iCrgw+YOKhoKkSk=y3rspyu0fjsaj+ezk9+ww...@mail.gmail.com
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Steve,
I'm not sure I follow everything you're saying about angle errors, but
there are a few installations that work well here in the SF Bay area that I
have personal experience with. The Listening Room at Stanford's CCRMA
is a 3rd-order periphonic facility, described here
https://ccrma.stanford.edu/room-guides/listening-room/
The others are in private homes, so I'll let the owners to chime in if they
please. They're good sounding rooms, but without special acoustic
treatment. (unlike my living room, which is glass on three sides). There
are several accounts of Ambisonic reproduction not working well in very
dead rooms, such as an anechoic chamber.
Also, for 3rd order periphonic you need to place a number of speakers below
the listener, which can be a challenge. The acoustically transparent floor
in CCRMA's Listening Room is one solution.Eric Benjamin and I have a
paper in the upcoming Linux Audio Conference on designing HOA decoders for
partial coverage speaker arrays, such as domes and rings.
Aaron (hel...@ai.sri.com)
Menlo Park, CA US
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