On 02/09/2013 04:20 PM, Enrique Tomas wrote:
then,
supposing that we impose using "only positive elevations" for the encoded audio
material, and loading your recommended preset,
if I truncate the physical speakers like:
0º elevation -> 8 speakers
+45º elevation -> 6 speakers
plus 1 speaker on top
will this truncation preserve the sound image decently?
it will sound just fine, but you will find that horizontal sources get
pulled upwards quite a bit (which is the "correct" behaviour really if
you truncate a speaker system without any countermeasures).
if you want to avoid this, franz zotter et al. have demonstrated a
solution a few years ago, i guess they called it the "energy preserving
decoder". it makes horizontal sources stay nicely grounded. i don't know
whether fons can provide a similar matrix for ambdec, all i know is his
usual decoding method will start to float if you take away the bottom
ring. for me, this "pull-up" is irritating enough that i try to avoid 3d
setups which are truncated on the equator.
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Jörn Nettingsmeier
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