Do I need a bigger amp?

[Hasdrubal]

I thought amps were usually advertised by RMS power, where aftermarket head units were usually advertised by peak power- that Kenwood has 22 watts RMS, so is probably less powerful than the factory amp.

Thanks to Washington weather I don't do a lot of driving with the top down, but I feel like I have enough volume with 50w RMS and a powered sub to be satsified. No factory amp though, so I'm getting the full spectrum through dash and door speakers, both sets of speakers replaced with infinity reference, nothing too fancy.