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Deadband is also known as hysteresis and is the amount of a measured variable (pressure, temperature, etc.) between the point where a switch closes and then re-opens. It can be implemented is software if you have an analog input (i.e., open at 1.02 PSI, close at 0.98 PSI) or designed into a switching mechanism. Often the deadband of a switch is fixed and cannot be adjusted. A typical example is in a wall thermostat in your house.
The Pre-out RCA jacks on the back of the receiver only output signals, not actual power. The red/black speaker jacks are for connecting speakers to it. The Sub Preout is for connecting to only a Powered Subwoofer. It will have all the high frequencies cut, its just the bass signal.