Phil Leigh;205507 Wrote: 
> 
> It's probably worth pondering how a planar diaphragm microphone is ever
> supposed to capture the correct phase in the first place, even in the
> Bass drum example, since when the drum head moves away from the beater
> the diaphragm moves in towards the mic and it will either generate a
> negative or positive voltage depending on how it has been wired
> internally...and then the mic internal amp/mic pre-amp may well be
> phase inverting...this is on reason why those phase invert switches are
> there...cos when you use several mics on the same source you need to be
> able to control the phase relationships overall.

Right - so you'd need a standard that was mantained throughout the
recording and mastering process, so that when the CD was pressed you
knew that (say) positive means compression wave in the original sound,
and negative rarefaction.  As far as I know nobody bothers to do that -
and as you say for recordings which involve any mixing between signals
from different mics, it's not even clear what that means (in fact I
think there is simply no way to use more than one mic per channel in a
way that preserves anything like a "correct" phase).  

Then you'd have to be sure that your audio system was wired so that
positive means speaker moves towards you (creating a compression wave),
and negative away.

All of this is almost certainly unnecessary...


-- 
opaqueice
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