Hello, 

I've been reading about how to calibrate monitors with Bob Katz's
k-system. Using the SPL meter method, I understand that each channel can
be fed a -20dBFS band-limited pink noise signal - and each loudspeaker
output adjusted to read 83dB SPL in the meter (or some other desired
level). This applies to individual speakers of a stereo system or to the
individual satellites of a 5.1 or 7.1 system.  Ardour 3.5 now has k-20
metering (and many other types) as does Fons' jkmeter. When k-20 meters
are reading 0dB RMS, the sound mixer knows that the corresponding
calibrated loudspeakers are putting out aprox. 83dB SPL. A pretty handy
thing I think.

OK: 

What does one do though if one is metering a B-format or other ambisonic
signal? Unlike stereo or 5.1 etc. the relationship between a particular
channel on the meter and a given loudspeaker channel isn't so direct
because of the decoding. jkmeter offers a 4 channel "ambisonic" k-system
meter, so someone (Fons at least) must have thought about this problem
before!

Sorry if it's obvious what to do - but please send suggestions on how to
go about calibrating loudspeaker levels for use with k-20 metering of
ambi-encoded signals.

Cheers and thanks,

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