They will be having classes for SPL, Sound Quality and possibly a class for those loud systems with the really annoying horns and tweeters. Classes will be based off the size and number of subs. $20 registration fee for the Sound portion. If anyone has further questions they can call Mega-Watt at 508-229-2233. This is NOT an NESPL event, it's being hosted by Mega-Watt as part of the Mass Appeal show. They said they'll be using the same meter as IASCA (termlab?) placed at the windshield and vehicles will be sealed. There will be plenty of stuff going on besides the car show, DJ's, Bikini Contests etc.