Question, can anyone here tell me what the difference is between the diffuse
and reverberant sound fields in an auditorium?

Geoley

"David Spearritt" wrote in message
...
They refer to different things, really. A diffuse field is one where the
sound pressure level is the same no matter where you are in the room, ie
the
sound is evenly distributed in the space, also the sound level does not
drop
with distance.

A reverberant field occurs where all sound is reflected, there should be
no
or insignificant direct sound. Now there maybe an area in a concert hall
where these two conditions are met, and for music it is difficult to
create
this scenario because the sound source is so transient. A diffuse field
could be set up with speakers on the stage and some continuous white noise
blaring forth, but music usually never lasts long enough to build up a
steady diffuse field.

If you did have speakers and some continuous broadband sound output, then
start with a microphone at the speakers and move away until the point
where
the sound level does not fall with distance, then you have arrived at the
reverberant field it is will probably be diffuse!

Cheers
David

"Geoley" wrote in message
...
Question, can anyone here tell me what the difference is between the
diffuse
and reverberant sound fields in an auditorium?

Geoley




Thanks David for the info. I'm contemplating buying a pair of schoeps omni
mics and they offer four different omni capsules, MK-2 direct sound close
in, MK-2H mid field, MK-2S designed for use at the edge of the reverberant
field , MK-3 diffuse field . I have been advised that the MK-2S capsules
would be a good choice for my use in recording pipe organ in a large church.

Geoley

Geoley wrote:
Thanks David for the info. I'm contemplating buying a pair of schoeps omni
mics and they offer four different omni capsules, MK-2 direct sound close
in, MK-2H mid field, MK-2S designed for use at the edge of the reverberant
field , MK-3 diffuse field . I have been advised that the MK-2S capsules
would be a good choice for my use in recording pipe organ in a large church.


Get all of them on eval and send back the ones you don't like. A good dealer
should be happy to let you do this.

The top end response on all of these capsules are different. Far be it from
me to suggest which one you'll like best. I'd suggest the MK-3, myself.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

In article , (Scott
Dorsey) wrote:

Geoley wrote:
Thanks David for the info. I'm contemplating buying a pair of schoeps omni
mics and they offer four different omni capsules, MK-2 direct sound close
in, MK-2H mid field, MK-2S designed for use at the edge of the reverberant
field , MK-3 diffuse field . I have been advised that the MK-2S capsules
would be a good choice for my use in recording pipe organ in a large church.


Get all of them on eval and send back the ones you don't like. A good dealer
should be happy to let you do this.

The top end response on all of these capsules are different. Far be it from
me to suggest which one you'll like best. I'd suggest the MK-3, myself.
--scott


Over the last few months I've recorded the same organ twice, 1, with the
MK-2S heads and 2, with the MK-2 heads. Both were great! Liked the MK-2s
fractionally better as I used spaced omnis for that job with a great
record chain. The MK-2 heads I used on a Jecklin disc with a not so great
record chain.

As Scott says, try them all on your job and keep the pair you like best.

--
Mike Clayton

Regarding microphones, most manufacturers now offer a "diffuse field"
capsule and a "free field" capsule for omni-directional microphones. The
diffuse field capsule has a slight high frequency boost in the eq to
compensate for an effective drop in frequency response when the mic is in
the far, diffuse or reverb field. The free field capsules are generally flat
in response and so may sound a bit dull in the reverb field.

If you are doing lots of near field recording with omnis, ie fairly close
miking, then the free field capsules will give the most tonally accurate
sound, but if you are recording choirs, in cathedrals and are miking the
room in the reverb field, then the diffuse field capsules are probably
preferred.

I purchased the diffuse field capsules for my KM130 omnis as I do lots of
nearfield/reverbfield boundary positioning of omni pairs for classical music
and choral music. Also a bit of HF boost when close can be equed out.

Here are some links:
http://www.neumann.com/infopool/mics...p?ProdID=km100
http://www.dpamicrophones.com/eng_pub/MicUni/55.html

Cheers
David