The M/S MATRIX converts a Left/Right-Stereo-Signal into its Mid and Side Components. The Mid component is the sum of the left and right signal while the Side component is the difference between left and right. Second, it converts a Mid/Side-Stereo signal back into its left and right components.
This is very useful to change the base-width of a stereo signal for example. Many other applications for that module are possible:
Audio Input jack L In & R In – Left and Right Input for a Stereo Audio Signal
Audio Output jack M Out & R Out – MID and SIDE Output for the converted Stereo Audio Signal
Audio Input jack M In & S In – MID and SIDE Input for a Stereo Audio Signal
Audio Output jack M Out & R Out – LEFT and RIGHT Output for the converted Stereo Audio Signal
Measures: 10 TE Power consumption -12V : 16mA / +12V : 16mA