Wireless speaker system for a factory

[Sparky]

Hi

I am looking at installing a wireless speaker system in our laminating clean room. The room is approx 30m by 20m and I would like 6 speakers in there. The guys mainly listen to the radio and the current system is not suitable as one end of the room its really loud and at the the other its barely audible .

Anything you can recommend ?

 

[Sparky]

It's an F1 Clean Room and has a sealed roof space so running cables is not really an option. Sound quality comes a close second to the ability to be totally wireless , well other than a power source.
Does the Sonos use a master speaker and the rest run off of it ?