Whatever the wattage is on the subs, you can go on there website and see how much power they can handle!
As far as amps, you can get 2 mono amps if you want to push them indivisually or 1 two channel amp with the wattage the equals the sub altogether!
EXAMPLE
1. if subs are 400 watts each, get 2 four hundred watt mono amps
2. if subs are 400 watts each, get 1 eight hundred watt 2 channel amp
(NOTE!) Make sure the amps can handle the ohms that the subs are some amps are 2 ohms some are 4 ohms
As far as amps, you can get 2 mono amps if you want to push them indivisually or 1 two channel amp with the wattage the equals the sub altogether!
EXAMPLE
1. if subs are 400 watts each, get 2 four hundred watt mono amps
2. if subs are 400 watts each, get 1 eight hundred watt 2 channel amp
(NOTE!) Make sure the amps can handle the ohms that the subs are some amps are 2 ohms some are 4 ohms