http://mustangworld.com/ourpics/fcar/despeeds1.htm What exactly do I need to add some bass to my Mach460 setup? I want to keep the 460 system though. My friend recommends me getting two 12'' Infinity Perfects. What else do I need? I didn't think I need an amp because of the Mach460, but my friend said I will most likely need to get an amp? Man I'm so confused.