I have a problem of directional confusion that depends on which B-format
player is used. I recorded a concert using my Oktava MK-012 4D ambisonic
microphone and encoded it to B-format using Brahmavolver. Yesterday,
while playing back the recording with the conductor we noticed that
under certain circumstances left and right appeared to be swapped.
At the time we were trying different virtual mic combinations to improve
the clarity of certain divisions of the choir, for ordinary stereo
playback. At first I used Harpex B player, because of the useful sound
scope display, then, when we had identified a likely mic configuration,
I processed the (B-format) files with VVmic using the same mic
configuration. What we noticed was that /in most cases/ the stereo files
created in VVmic sounded just the same as when we played the recording
in Harpex B player, for the same virtual mic configuration. But if the
mic configuration was Blumlein (crossed fig-8s at 90°), then in the
VVmic-produced files very audibly the sopranos and violins were swapped
from the left side of the soundstage to the right side, and other very
obvious voices (basses, altos) and instruments (cellos and double
basses) were swapped from the right side, where they had been on stage,
to the left side.
Everything sounds correct for any microphone combination in Harpex B
player; everything seems correct also in VVmic except if fig-8s are
selected. I would like to base my recording on the Blumlein
configuration as the basis, with other reinforcing mics added in. But it
is not working for me if I use VVmic (and I can't afford the full
version of Harpex). Can anyone explain what might be happening?
Gerard Lardner
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