My RF 3 II says the max input power is 150 watts and my RF 3 says the max input power is 225 watts. Both have a peak power of 600 watts. I found a manual on the internet for both of these speakers so those figures are presumed true.
I do not know what the xo point of the HF driver is. Being how expensive Monster cables are, I am guessing that is what made the RF 3 ii's price go up. To me, the RF 3's seem like the better speaker on paper but side by side, I can not tell the difference.