On most airlines, if you live in the city from which the flight is departing, you will not be eligible for compensation. To avoid the hassle of dealing with a flight cancellation (or delay), try booking flights that depart early in the day. That way, if your flight is cancelled, you will have more options for being rebooked on a later flight.
How Passive Radiators Work. A passive radiator speaker is a simple device that increases the low frequency response (Bass) of a speaker system*. When used properly, a passive radiator can give a speaker system the comparable performance characteristics of a much larger system; that's the point, in a nutshell.
A good example of a passive crossover is the crossovers that come with a component speaker system. Passive crossovers are wired in-line between the speakers in your system and the amplifier (or source). The passive crossovers that come with your component system come tuned and ready to be installed.