If I have a 2 ch. amp (Rockford Power Series) that is 1 ohm stereo stable, do you think 4 sets of the 62.9i's would be pushing it? I only ask because someone said they were closer to being a 3 ohm speaker. If not 4, what about 3 sets? What true ohm load do you think the amp will really see? I'm starting to think that it is just a really efficient 4 ohm speaker because how are they able to be ran off of a head unit safely?//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif