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Mid-Side (M-S) Technique
In the early days of stereo radio broadcasting, the mid-side
recording technique was developed to allow for 1) simultane-
ous stereo and mono feeds from the same mic array and 2) elec-
tronic manipulation of the width of the stereo image.
In M-S recording, one mic faces sideways, one faces forward as
shown in
Figure 2 , and they are connected as shown in Figure
3 .
If the outputs of the two microphones are equal (or made equal
using gain controls), the stereo pickup will be similar to that of
two microphones placed as a Blumlein X-Y pair, delivering a
wide stereo image.
As you reduce the level of the “side” microphone, the width of
the stereo image will narrow until, with the side microphone
turned all the way down, you have just the “mid” mic panned
center for a mono pickup.
Mid-Side pair as seen from directly above
S
M
90 Degrees
Sound Source
(CENTER)
Figure 2
- Typical M-S miking technique
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