I read the comments regarding mh Acoustics' eigenmike. Of interest was the
topic of off-axis coloration (particularly FA's response and explanation).
Off-axis coloration is often used to *advantage* -- at least when a certain
characteristic sound is desired. When you consider how differently top vocal
microphones sound (e.g. Sony 800G vs Neumann U47), sound recording engineers
accept and embrace coloration. But as it applies to Ambisonics or
HOA/multi-element mics, I can see where there are problems. Do same issues
apply to VisiSonics' mic and/or software? The prior discussions made me wonder
whether calibration for many *tetra* style mics is sufficient; that is, are
polar responses of first-order subcardiods predictable from on-axis amplitude
responses or IRs that are obtained on-axis? Would phase plots provide more
useful info or prediction? (I think of the tightly calibrated BK/DPI mics used
in sound power and intensity probes and how they're matched
in phase as well as frequency response.) If IRs were taken off-axis (maybe
they already are for the TetraMic?), what might be the *best* polar coordinates
be for obtaining a response needed to minimize inherent or potential problems?
Just questions... sorry I don't have answers... but at least this topic helps
us consider ways to improve upon the hardware (mics) and software. Many thanks
for everybody's time.
Best,
Eric C.
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