I was looking at the info for the shiva and all and i tried to understand what size box i need and all but im a newb and it really didnt clikc with me. Im goin to have the local Tweeter shop build the box. What do you guys recommend for the Enclosure size and tuning for 2 12" shivas. I am goin to be powring it with a kicker 600.1 amp. Also whats the best way to wire them up for max performance.