Shure V-15 Type III Manual page 5

Since Shure engineers have long known that isolated improvements
in individual design parameters do not necessarily produce significant
changes i n total cartridge performance, all improvements were
brought into perfect equilibrium with each other, so that each per-
formance factor enhanced every other performance factor.
The result of this unique balance is a total audio effect greater than
the sum of its individual performance characteristics. To science, this
phenomenon is known as a synergistic reaction; ergo, we call the
V-15 Type 1 1 1 the Synergistic Cartridge.
Four-channel compatibility
The same performance parameters that apply to conventional stereo
-especially trackability-also apply to four-channel matrix systems.
Because mistracking is one of the most noticeable types of distortion
in four-channel playback, the V-15 Type Ill, with its outstanding
trackability, is a superb performer in all four-channel matrix systems.
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