Summary: These speakers are getting a work out from my Clarion CMD8 system. I'm not young enough to turn it all the way up and I haven't been drunk enough to abuse them but they've handled everything I've sent in their direction. I've even sprayed them with the hose when washing the boat. The tweeters are directional which is kind of neat. I will admit that the tweeter dome is very fragile. I accidentally dented one with my finger trying to wipe off a piece of scuzz.
Summary: I purchased a pair of these and a pair of the Apline 6.5" to replace some cheap Boss Audio that I bought 2 years ago, one of which one died. There is a world of difference in terms of sound quality and bass when installing these. I run these straight off a Kenwood KMR-700 head unit and they sound great. No need for an amp in my case and opinion. The 7" is a much better quality speaker than the 6" which seemed a bit small.
Conclusion: The alpine speakers sound great. They handle the power very well. They are great for the boat, and fill the boat with good solid sound. I have two in my 20' flats boat, and the sound radiates the dock.