Re: Stereo Microphone Placement

From	Anton Shepelev <anton.txt@gmail.com>
Newsgroups	sci.physics.acoustics
Subject	Re: Stereo Microphone Placement
Date	2017-01-13 00:19 +0300
Organization	A noiseless patient Spider
Message-ID	<20170113001914.2e0a121e4611d25bc2d5762a@gmail.com> (permalink)
References	<fmmck-61D296.13043319082014@5ad64b5e.bb.sky.com> <isw-7F1E16.21300119082014@[216.168.3.50]> <fmmck-86038D.01120720082014@5ad64b5e.bb.sky.com> <lti7pd$o28$1@panix2.panix.com> <fmmck-939303.20023529082014@5ad64b5e.bb.sky.com>

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Fred McKenzie:

> I  am trying to record what a person would hear if
> they were at the same spot as the microphones, re-
> alizing that there are differences.

A  very commendable goal, which deplorably few sound
engineers strive for.  Binaural (dummy head) record-
ing is the best way to achieve it, but the recordigs
must be listened to either via headphones or a  con-
ventional  stereo  system  supplied  with a binaural
processor, which removes cross-feeding (right speak-
er to left ear and vice versa).

> At  a  recent  concert,  I had the two microphones
> about 10 inches apart, but pointing in almost  the
> same direction.

Were they the cardioid SM81s?

> They  were about 7 feet above the stage floor, and
> about 5 feet left of center.  I am very happy with
> the  results  as far as frequency response is con-
> cerned.

Note that cardioid will attenuate the lower frequen-
cies when placed far from the sound source.

> I  am  not  happy  with some instruments not being
> heard as loudly as expected ->

Do you mean as the  listener  would  percieve  their
loudness  at the microphone position?  That may have
to do with directivity and be amendable by orienting
directional mics or using omnis.

> -> and the lack of stereo effect

How  far  away  was the (actual) scene and how wide?
Try increasing the spacing to  20  inches.   It  may
help.

Try  to compare your recording with the sound of ei-
ther channel in mono using  headphones.   This  con-
trast  helps  to perceive even a small stereo effect
if it is there, but only for  AB  stereo,  which  in
your case means parallel microphones.

One  advantage  of time-based stereo is that it will
make individual instruments more discernible by bin-
aural demasking.

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Thread

Re: Stereo Microphone Placement Anton Shepelev <anton.txt@gmail.com> - 2017-01-13 00:19 +0300
  Re: Stereo Microphone Placement Fred McKenzie <fmmck@aol.com> - 2017-01-12 22:19 -0500
    Re: Stereo Microphone Placement Anton Shepelev <anton.txt@gmail.com> - 2017-01-13 16:52 +0300
      Re: Stereo Microphone Placement Anton Shepelev <anton.txt@gmail.com> - 2017-01-13 18:10 +0300
      Re: Stereo Microphone Placement Fred McKenzie <fmmck@aol.com> - 2017-01-13 11:44 -0500
        Re: Stereo Microphone Placement Anton Shepelev <anton.txt@gmail.com> - 2017-01-14 01:30 +0300

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