Hear the roar in Indianapolis? It’s not the Indy 500. It’s CEDIA EXPO, the tradeshow for the residential electronic systems industry. The event was last in Indianapolis, the headquarters’ home of the Custom Electronics Design & Installation Association, six years ago in 2005 and this year it is back at the Indiana Convention Center, Indianapolis, starting September 7 with the tradeshow first opening on September 8 and continuing through September 10.