[FMEng]

When the transmitter and receiver are designed as a system, there is no reason for the end user to care what the deviation is. Companding plays a huge part in wireless mics, which means that audio performance is not as directly related to the amount of deviation or frequency modulation used. In other words, you could not draw any conclusions from the deviation specs of two models with different companding schemes.

All the user needs to know is whether the system is operating within proper parameters, which is why they put audio level meters on them.