You'll have to argue with Prof. Angelo Farina. Frankly, between the two
of you, I know whom to trust.
https://www.facebook.com/groups/Ambisonics.VR.360.Audio/?multi_permalinks=5265393360254911¬if_id=1666553911378133
<https://www.facebook.com/groups/Ambisonics.VR.360.Audio/?multi_permalinks=5265393360254911¬if_id=1666553911378133>
Angelo Farina wrote:
I can answer about the microphones. What matters is their number, not
their arrangement. The noise floor of each
Ambisonics signal is lowered by 3 dB for each doubling of the number of
microphones. So, if a single capsule has
a noise floor of 20 dB(A), when you use 4 capsules the W channel will
have a noise floor reduced by 6 dB,
14 dB(A). If you use 8 capsules, the W channel will have a further
reduction of 3 dB, hence 11 dB(A).
If you use 32 capsules (Eigenmike) the noise floor will be down other 6
dB, at 5 dB(A).
---
One of the standard mic theory texts also confirms this.
Len Moskowitz (mosko...@core-sound.com)
Core Sound LLC
www.core-sound.com <http://www.core-sound.com>
Home of OctoMic and TetraMic
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