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Re: Physics of moisture-induced mic noise

Subject: Re: Physics of moisture-induced mic noise
From: "Scott Fraser" scottbfraser
Date: Mon Jan 4, 2010 9:10 am ((PST))
<<My advice is for those of us who have had these problems is to put
together a database of the model of mics, noise events, conditions,
time, age of mic, etc., to see if there is any type of correlation
that can be gleaned form this data. Perhaps a pattern will never be
found. But at least we can perhaps get some idea of what mics have
what problem under what conditions. Mics that perform well and that
don't make it to the "event list" would probably be good candidates
for field work.>>

Good idea.

Mics: (2X) AKG C451/CK1/A51 swivel joints. (Externally polarized
condenser.) Inside Rycote blimp with fabric cover & furry windshield.
Noise event: Frequent (several per second) popping.
Conditions: Tropical rainforest, Costa Rica.
Time: Daytime.
Age of mics: Probably at least 12 - 15 years.

The solution:

Mic: AudioTechnica AT825 (Electret) Inside Rycote blimp with fabric
cover & furry windshield.
Noise event: None detected.
Conditions: Tropical rainforest, including several rain events, Costa
Rica.
Time: day & night.
Age of mic: Less than a year.

Additionally:

Mics: Built-in condensers Sony PCM50. (Presumably electrets.) Inside
Rycote furry windshield.
Noise event: None detected.
Conditions: Tropical, hot humid. Bali, Indonesia.
Time: Day & night.
Age of mics: Less than a year.

Scott Fraser








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