I've built some speakers using Jordan JX92s full range drivers. To
boost the low end I plan to place a resistor/inductor network in
series with the driver (resistor and inductor in parallel). However I
don't know what the power handling capability of the resistor and
inductor should be, as this is not a crossover, all the power passes
through this network.

The JX92s can handle 100W (50W continous) of power.
Does this mean my resistor and inductor must also be rated at 100W?
For wire wound components could I use the gauge of the wire as an
indication of what power they can handle?
Is there any advantage of an air cored inductor over a ferrite cored
one?

I see Falcon Acoustics http://www.falcon-acoustics.co.uk/pl28p6.htm
sell 50W resistors but most UK retailers don't indicate the power
handling of their components.

Thanks
Ivan