Unknown. The 1800W rating is going to be at som impedance. The speakers have an impedance. Without knowing more about the amps and the speakers that can't be answered.
Unknown. The 1800W rating is going to be at som impedance. The speakers have an impedance. Without knowing more about the amps and the speakers that can't be answered.
kanewolf is correct but to give you a general answer.
Yes you can but you have extra power to blow the speakers if you don't limit the maximum volume that you play them.