Total posts : 45366
If your planning multiple transmitters and are planning to place them outdoors the rangemaster is the ONLY way to go.
Sync is something the rangemaster can do but will require a cable strung between transmitters, I think there may be an GPS option now with the rangemaster. you would need to talk to Keith Hamilton about that.
Barix boxes can be used to feed audio but here again there will be delay on the TCP/IP packets getting to the radios. the only other thing that you could do is use some sort of 915/2.4/5.7Ghz audio link to feed the transmitters.