No I am not planning on changing anything but the speakers. Would I be under driving the 1682s?
I have the RF 1572s, just did the doors the other day, doing the rears next week and I love them. So crisp and clean compared to factory. I read that the 1682s recomend amplification so if you are not planning on that maybe get the 1572s.
My guess is you'll be better off with the RF 1572s cbax35 recommended. The stock HU simply doesn't have enough power to drive those speakers. Turning up full blast will lead to distortion.