On 2022-04-26, Martin Leese wrote:
In three weeks I have the opportunity to record a Jazz Duo with a
concert grand piano (Steinway) and a singer in a recording studio,
with controled acoustic.
...
The job is to record the duo in the classical way (Stereo) and now comes
the fun part: in Surround and / or Ambisonic, too.
I have never recorded anything, so please ignore what I say.
Me neither, but...
Perhaps I have misunderstood something, but I assume the studio will
be acoustically dead (no early reflections or reverberation).
It is never so. A proper studio is silent, rather to be told, but not
fully. Instead it's controlledly silent and dispersive at the same time,
in order to at a low level mimic a reverberant concert hall. Also, some
of the studios, in their early echo rooms (
https://en.wikipedia.org/wiki/Echo_chamber ) actually multiply miced
their output, first from a mono speaker to one mono pickup, and later
from multiple mono speakers within the room to multiple mono pickups,
leading to full 4x4 decorrelation of the Lexicon kind, in DSP reverbs.
When micing a Steinway grand piano, the technique is even more involved.
Because it's done for effect, divestiture and ambience, using very
little machinery at the same time. Some of the machinery being
substandard as well. What you do is employ contact mics for the low
frequencies, from the frame, you do two or three directional mics
towards the opened case of the grand piano from behind and from above,
and then you do an ambience mice (preferably a SoundField) from above to
the audience, slightly beyond the radiance bound. Time align all of the
signals, empirically.
I am not sure what will be the point of reproducing this in surround.
It can be exquisitely nice in surround, if you know what you're doing.
Especially if you mic your jazz cymbals right.
Also, close miced fields can be rather forceful if miced right. I don't
think Björk knew what she was doing on her eponymous disc, but just
listen to the result: what the fuck is this, even:
https://www.youtube.com/watch?v=PF_k6mIw9w0 ("There's more to life than
this (recorded live at the milk bar toilets)".
It actually might be about SoundField and BHJ encoding.
You really need an acoustically live studio so that there is some
surround to record.
In fact a live acoustic is even needed in order to average over spatial
kinks, both in mic setup and in the coarser features of the room. Hence,
dispersing toppings overall.
--
Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front
+358-40-3751464, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
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