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Posted to rec.audio.opinion,rec.audio.pro
Phil Allison
 
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Default Chinese? ribbon mics?


"Arny Krueger"

Capacitance is only significant when its impedance within the audible
range is less than 10 times any parallel resistance. Three relevant
resistances are 13K (the approximate maximum input impedance of a mic pre
with phantom power), 2 K (the approximate input impedance of many mic
preamps, and 600 ohms.

I did a little spread sheet and came up with the following capacitances
for 20 KHz and the three resistances:

600 ohms 0.066314561 uF
2,000 ohms 0.019894368 uF
13,000 ohms 0.003060672 uF



** All WILDLY wrong numbers !!

The "correct" values a

1320 pF, 390 pF and 60 pF.

C = 1 / ( 2. pi. F. R )


The capacitance for the highest resistance is equivalent to a mic cable
about 100 foot long.



** Nope - about 1 foot long.

A totally silly and pointless calc.

Arny's premise is false - again.

Yawnnnn ......



......... Phil