I hooked up the wiring on a pair and snapped some actual photos to help you out:
The master amplifier gets the input from the head-unit and a mono RCA from "BR Out" connected.
The slave amplifier ONLY gets "BR In" connected from the master.
ALL controls are handled on the master, setting anything on the slave is not necessary.
This picture should be pretty self explanatory.
* The slave takes the "-" connection(s)
* The master takes the "+" connection(s)
* The "-" terminals of the amps are hooked together.
You don't need to use both sets of "+" on the amps. They are there for flexibility. While you should always connect both "-" terminals on the amps together using large wire as general procedure it is not absolutely necessary to use both sets of "+" terminals. They are connected together internally in parallel.
When strapped the MASTER controls ALL functions of both amps.