My parents Navigator has a 14 speaker 600 Watt THX sound system with a built in woofer. That'll give you a boner whether you are jamming out or watching a DVD. Road trip machine

 

those are nice, my boss has one i didnt think it was stock..

 

I can tell you from past experience Kappas have a very good sound. However, they are a bit on the bright side and you'll probably find the highs on certain types of music almost ear piercing at higher volumes, they're clear as a bell though. Unfortunately mine blew easier than I expected, could have been the set I had and not necessarily an indicator of their stuff overall, just be careful with them