I have a friend that is going to power a pair of Polk RTI12 towers, a center and RTI6 as rears with possibly the new AVR740. Is that enough power? It is rated at only 85W per channel, while the AVR7300 (HK by the way for both), is rated at 115W per channel. The AVR740 has the features, but for some reason all of the HK's have low power ratings, in comparison to others like Marantz, Onkyo and Denon, which are usually rated at at least 100 W per channel in just about all of their receivers. Why is there a difference and should the HK AVR740 be enough, or does he need to do the AVR7300?