wire guage and amp capacity

Ok i have recently purchased infinity kappas (100watt rms) that come with crossovers. The input wire guage as well as the output(to speakers) is 18g which has an ampacity of 5 amps.

I realize it is only 14 inches of wire to the iinput of crossover, by why not use the proper rated wire, especially when there is potential to over heat the wires?

could any one shed some light?

thnx

You can find current without first finding amplifier output voltage by using Ohm's Law I = SQR (P/R).  5 amps (100 watts into a 4 ohm impedance).

You'll be looking for 20 AC volts output.  E = sq rt (P x R), so if power is 100 watts and impedance is 4 ohms the math says the output is 20 volts.  Double check amperage by using I = P/E which confirms 5 amps (and that's maximum, as stated above, for very short durations if it ever gets there to begin with).