Henry Spragens,
So what happens if I have a mic with polarity reversed?
Usually, nothing.
Google this:
"what is the 3 to 1 rule when dealing with microphones"
The book by one of the founders of Electro-Voice, Inc "Lou Burroughs"
Microphones: Design and Application
Sagamore Publishing Company ISBN0-914130-00-5
Chapters 9+10 are very illuminated
Note "Lou Burroughs" always use "Out of Phase" which is more properly called
"Out of Polarity which is today the proper use when pin 2 & 3 is swapped or the
so called Phase switch is in use which is a Polarity switch as anyone can see by
looking at the mixer schematic and what happens is that a simple inverting opamp
is switched in circuit and how that can produce any phase change is completely
beyond me.
An inverting -amp = polarity switch is -180¡ã for ALL FREQUENCIES, while phase
differences is ALWAYS RELATIVE to something, input, that is held constant then
compared to the, output.
And thus when putting up mics it is the distance in meter or feet that sets the relationship
between one mic to another mic that gives rise to acoustic phase cancellation and the 3:1
rule avoids this as shown by Mr Burroughs.
That book is very good and was published in 1975 when polarity versus out of phase was
known but much better to make absolutely sure that the correct expression is used to avoid
so many false misconception that seems to never ever die completely.
------------
Best regards,
Goran Finnberg.
The Mastering Room AB
Goteborg
Sweden
E-mail: mastering@...
Learn from the mistakes of others, you can never live long enough to
make them all yourself.??? -?? John Luther
(\__/)
(='.'=)
(")_(") Pyret, Ranglet, Aron, VovVov, Nero, Smurfen & Pussin:RIP
