Audio Developments AD149 - Manual (Page 14)

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M-S / X-Y TRANSFORMATIONS (M=S)
FIG 2
(An X-Y pair of cardioid microphones matrixes
to a sub-cardioid and figure-of-eight microphone.)
Sounds arriving where the M- and S-patterns intersect are reproduced fully left or fully
right and define the included angle of sound which is spread completely between the
loudspeakers.
A very effective M-S combination for use where normally a single gun microphone
would be used is a hypercardioid microphone (M) in conjunction with a figure-of-eight
microphone (S). However, during our research it has been made very clear to us that
the Sennheiser MKH 416 short gun microphone is going to be a very popular choice
for the M-signal. When using gun microphones for the M-signal it must be borne in
mind that they become more directional with increasing frequency and have LF and
MF side lobes. Very odd effects can arise if used against a moving background.
A stream of traffic, say, will change its perspective as it moves across the various
lobes.
(It should be noted that the sensitivities of the 12V tonader and the 48V phantom
powered versions of this microphone are not the same.)