Sayre BermanAC/DCSaturday, December 20, 2008BankAtlantic Center, SunriseBetter Than: Volume itself.To say that AC/DC were loud Saturday night is kinda like saying the sun set and the sky turned dark; a statement of fact, perhaps, but pretty much unnecessary. To say that AC/DC were louder than any show I've seen since I caught Motörhead at NYC's old Ritz, however, is saying something indeed. Why? Because Motörhead were so loud I saw colors; that's why. Not colors from the stage lights, mind you