02/08/2008 06:25. "In the motion picture industry we have been mixing in the 5.1 formats since the mid-'80s," Summers says, "so I am very familiar with a wide variety of 5.1 program materials." Unfortunately, car audio equipment in the '90s was limited in terms of processing for surround sound. Summers and installer Aaron Braverman had to look elsewhere. "We decided to take home audio products and modify them to work in a 12-volt system in order to decode the 5.1 digital audio formats," Summers reveals. But before they could... // Car Audio