[Don Pearce[_3_]]

On 29 Jun 2009 10:18:38 -0400, (Scott Dorsey) wrote:

drichard wrote:

I didn't realize there was a formula for projecting the amount of
proximity effect on a mic during recording. Maybe this is a dumb
question, but is there anywhere I can read up on this?

It's a function of the microphone pattern and the distance, both. The
closer to a figure-8 mike, the more proximity effect, the closer to an
omni, the less.

Any given microphone should have curves on the data sheet that list
response up close and far-field, but a lot of manufacturers have stopped
doing this is part of the general attempt to dumb-down datasheets. So
you will have to use your ears.
--scott

I have the maths on my web site. It is for omni, cardioid,
hypercardioid and figure 8. Patterns intermediate between these four
types can be approximated by interpolating the curves.

http://81.174.169.10/odds/mic

In fact all mics are intermediate, depending on the frequency. As far
as I know, no manufacturer has managed to make the pressure response
and the velocity response have precisely the same frequency response,
which would be needed for a non-frequency-dependent pattern.

d