Dear Terry:
I posted a "self-noise" white noise comparison, by frequency domain, on my
web site and referenced to this group in June 2003. The mics were
Sennheiser ME-67s. This is a much researched and perhaps overly-discussed
issue - - - it always comes down to this: get the lowest self-noise mic you
can possibly afford, and get as close as possible. Walt is right.
Please see http://www.enjoybirds.com/howitworks/micCompare.htm
best regards, Marty
At 05:27 PM 11/24/2004 +0100, you wrote:
>Very good points!
>
>Walt, I'm trying to understand the noise that is output by a typical good
>condenser mike: that is it's "self noise". Is this wideband uncolored
>(white) noise, typically? I'm thinking about designing a preamp, and
>wondering if I want to be able to do any frequency-domain adjustments or
>cutoffs, or none. I have a couple of Shure WL183's that have a rated
>self-noise of 22.5 dB SPL. Am I correct to assume that a desired signal
>that is 32.5 dB SPL would give a SNR of 10 dB? Do you have any recordings
>of a microphones self-noise in an acoustically quiet environment? I'd be
>interested in doing a spectral analysis on the noise.
>
>On another related subject: Some online sample soundscapes have known
>human-caused backgrounds such as distant power plants and trucks on a
>distant highway. Has anyone tried the sampled-noise reduction techniques
>on these type of noise sources??
>
>Just thinking, but soon recording: I just got my M-audio Transits in the
>mail...
>
>Any suggestions, pointers appreciated.
>
>Regards, Terry King ...On The Mediterranean in Carthage, Tunisia
>
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