Mine could hear each other and it didn't seem to bother either the flaying flock or the roo's. Can't say for certain though. It might even be breed dependent in that some breeds may be more attached audibly than others?
I've had good experiences segregating males out into a bachelor pad. They still establish a pecking order, but the lack of females to act as competition over seems to keep them calm for the most part.
One particular instance that I recall: I had a batch of Araucana's that ended up being mostly...