Douglas recording: The Mid Side-Stereo (Introducing the MS Matrix)

The mid-side stereo technique provides a "fake" stereo image, considers it as being comprised of central and side elements unlike the actual positioned right and left image like the XY-technique. It is the side signal that contributes to the stereo width which most of the cases takes its signal from a omnidirectional or figure eight pattern microphone. The side microphone use two channels, one panned left, the other panned right with the polarity reversed. The mid signal is mono panned center.

Position the mid side microphone in front of the stereo subject. Be aware that omnidirectional pattern can also be used as mid-microphone instead of directional mics. Make sure that the side-microphone is bi-directional (figure 8 pattern) and is so called “coincident pair” with the mid microphone, I.e. as close as possible. The front of the side microphone (phase-positive) should be pointed 90° to the "left".

The AKG C24 have two identical capsules (e.g. o + 8) which makes it ideal, but not necesarry m-s choices.

So, finally, the m-s stereo method eats up three channels on the console; one panned center, one left and right with the polarity reversed. To avoid this situation the MS Matrix is a must. Instead of adjusting the stereo field with two faders with exact amount gain, the MS Matrix do it with just one knob; Side. You figure out the rest, look at the picture below. If using a console, you may use the the MS decoder on the channels inserts. Otherwise pre amplifiers out to MS Matrix in, then Ms Matrix left and right out to tape machine.