I just purchased a set of Diamond Hex s600s and s500s (Yes, I know, I don't need rear fill blah blah blah... it's a personal preference) and plan to power them with a Diamond D6600.4 amp. It's a 4 way with 75 RMS 100 peak per channel (and probably underrated). The Diamonds are rated 150 nom/300 max and 100 nom/200 max respectively. I've heard that underpowering the Hexes is a bad thing, but I'm hoping that 75-100 watts of clean power is enough to get them moving and create a decent amount of midbass. The magnets are gigantic, though, so I'm a little worried that I might be being optimistic. I have no first hand experience with the speakers powered by anything other than 300w two-ways. Does anyone have experience with the Hexes or extensive install experience with similar hard-to-drive comps?