[Top] [All Lists]

Re: Good mics, medium mics, the best mics - what's the difference on

Subject: Re: Good mics, medium mics, the best mics - what's the difference on
From: madl74
Date: Mon Jun 16, 2014 6:16 pm ((PDT))

The bottom line is what a recording sounds like to the recordist's ears and=

of course to other people listening to the recording.

My Sennheiser MKH416's have an HF noise level which is usually drowned by
natural hiss from wind on leaves and a distant stream, but the pile of
bedclothes test reveals an HF tip-up which is close to where the thermal
noise of air would be. One day I will prove this by putting it Into a

> Here is a wild guess, and I'm not an acoustics expert, but If there is a =
way to apply the sound level dampening over distance rule where we hear a s=
ound level drop of 6 dB per doubling of distance, maybe we could say that a=
 6 dB decrease in self-noise would allow us to hear twice the distance for =
a given location. Of course that would be a gross generalization.

We've got such a rule, the sound level from a single source drops 6dB every=

time you double the distance, plus some other factors like HF sound
absorption. If you can get closer to a wildlife sound source, you can alway=
improve the signal to background-plus-mic noise ratio.

Whose definition of "self noise" would you use? To have any meaning, this
has to be an "equivalent self noise" in other words the acoustic noise leve=
in Phons which would give the same noise level as the mic itself, in other=

words a sound which would raise the total mic noise level by 3dB.

An "excess noise" figure means noise in excess of the fundamental noise of=

the air itself using a stated weighting. Or should do with a quality mic.
Anything goes to sell cheap mics. :-) "Self noise" is often what a
manufacture wants to define it. It's just noise.

Other specs relate the total mic noise to 0 Phons but perhaps not saying so=
or even give the noise of the mic preamp with the capsule disconnected. Thi=
is meaningless to anyone who wants to actually use the mic, but looks good=

on sales blurb.

A quality mic spec will sometimes look inferior to a hyped cheap mic becaus=
the base level has not been defined. The final verdict is of course - as I=

said - given by a pair of good ears.

David Brinicombe

"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.

Yahoo Groups Links

<*> To visit your group on the web, go to:

<*> Your email settings:
    Digest Email  | Traditional

<*> To change settings online go to:
    (Yahoo! ID required)

<*> To change settings via email:

<*> To unsubscribe from this group, send an email to:

<*> Your use of Yahoo Groups is subject to:


<Prev in Thread] Current Thread [Next in Thread>

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the naturerecordists mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU