I was curious. I got the subwoofer option from the dealer. I was toying around with the radio one day and found that when you fade the speakers to the rear, the sub fades as well. Concurrently, the sub's volume stays the same when you fade to the front. I talked to the service dept. at the dealer and they said that's just the way the radio's wired. It's not a heck of a big deal, but I was just wondering if I was BSed by the service people.