New autohifi->confusion!!!

Hi people I just have the new autohifi in my hands and have read some articles among other things one in which it goes over amplifiers.Here it says that: “ideal amplifier power=2* is the smallest specified loadability specification”. That’s not possible!! I have now chosen the Focal 165 V2 by asking in the forum for my frontsys and also ne Wanted 4/320 power amplifier and a sub hangs and everyone said that fits so.But that’s not true at all. The power of the amplifier just barely exceeds it. And the power of the sub doesn’t exceed it at all. What should I think about it now? Does the Sys not work I need a better power amplifier? Thx