I just went and listened and I see what you mean. But it sounds like a western accent to me, not southern.
Does anyone know who this voice actor is, that is... and particulars on him? (Tom Luce is the name...)
I only ask because I was watching the 2nd (and last) season of Fairly Legal and there was a new character. He had a noticeably kind of flat American accent I couldn't quite place. It didn't exactly sound midwestern and I wasn't sure if it was western. I looked him up and he was Australian! So he was doing an American accent. I wonder if Tom Luce is a British actor trying to do an American accent but not quite understanding what *his* American accent would evoke. It's always seemed to me that, back in the day, affected accents were never realized with much success though. They've gotten a lot better. Sometimes I can't tell that a non-American actor's natural accent is not American.