There generally won't be an audible difference in running an amp with a 2 Ohm load versus a 4 Ohm load. The only real difference will be at the lower impedence the amp will create a larger current demand on your charging system.
I don't believe there is. I run my system at 2 ohms just because of the setup. Also you amp will put out more power. otherwise no sound difference or at least so far. LOL
Yeah... just be sure your amp is stable at 2 ohms... cause mine is not. I wanted to put two subs on it and double the power of my amp so each of my subs would have the same ammount of power as my single receives now... but I can't //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif.