Actually, a square or rectangular decoder's outputs are such that if all
four outputs are mixed together in equal amounts, the directional
components (X and Y) will cancel out automatically leaving just the W -
which is generally what would be sent to the sub...
Dave
On 21 October 2013 01:11, Marc Lavallée m...@hacklava.net wrote:
Matthew Palmer palme...@mymail.vcu.edu a écrit :
I'm wondering if it (4 sets of Logitechs) can give me 3d
gratification for a little over $200. I know I'm definitely
sacrificing quality but it will take me ages to save up for a proper
set-up.
I don't understand what kind of amplifier would be needed though.
Yes! 4 small speakers with one sub are enough as a starting point:
I suggest reading Localization in Horizontal-Only Ambisonic Systems :
http://www.ai.sri.com/ajh/ambisonics/BLaH1.pdf
Use a square or rectangular configuration, and drive the sub with the W
ambisonic channel; you can use a multimedia 5.1 kit (with integrated
amplifiers), but the sub should be driven separately, not by a mix of
the 4 decoded speaker channels (that's my comprehension).
For un-amplified speakers, you can use cheap D-class amps.
I don't fully understand what cross-over frequency is (it sounds
obvious though) but maybe by reducing the center channels from the
set-up , I'd reduce the amount that is happening.
I would not use the centre channel; there are experimental 5.1 decoders
but I never tried. The cross-over frequency is between the sub-woofer
and the satellites. Ambisonics works well at low frequencies in small
rooms, at least down to the Schroeder frequency (usually around 150Hz,
depending on your room size and acoustic treatment). That's why 300Hz
is a bit high, but it's not catastrophic.
Ambisonics with height is possible with a 3D7.1 configuration (using
a 7.1 speaker kit). I yet have to try it.
--
Marc
On Sun, Oct 20, 2013 at 7:12 PM, Charlie Richmond
charlie@gmail.comwrote:
On Sun, Oct 20, 2013 at 3:59 PM, Marc Lavallée m...@hacklava.net
wrote:
What matters is rigidity; if a plastic enclosure is rigid
enough (for its size), then it would sound the same than a hard
wood enclosure. In the specific case of the Z506 model from
Logitech, wooden enclosures for the satellites would make no
difference; the drivers, the amps, and the enclosures are too
small to shake. Only the sub-woofer enclosure is made of MDF, for
a reason.
So, why not using the Z506 5.1 kit from Logitech? Multimedia
speakers are primarily designed as computer accessories; some are
probably well made, excluding the one in the MoMA's permanent
collection (unless aesthetic is the most important criteria). I
wouldn't trust its sound quality; it's a bit small unless the
listening distance is less than 2 meters, the centre speaker does
not match the four other satellites, the centre speaker have 2
mids and the satellites have one mid and one tweeter, and the
cross-over frequency for the sub-woofer is probably near 300Hz,
which is a bit too high. For Ambisonics, I believe that better
quality full-range or coaxial speakers, all matched, should be
preferred.
I would only such use small multimedia speakers for a very compact
periphonic installation, along with 4 to 8 small sub-woofers for a
supplemental horizontal or periphonic low frequency decoder.
Agreed. That said, the Logitech self powered systems are generally
extremely well made and sound very good, imho.
C-)
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--
--
As of 1st October 2012, I have retired from the University.
These are my own views and may or may not be shared by the University
Dave Malham
Honorary Fellow, Department of Music
The University of York
York YO10 5DD
UK
'Ambisonics - Component Imaging for Audio'
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