Board Thread:Questions and Answers/@comment-3207457-20161020233334/@comment-477304-20161021151204

Well 4Kids is an anime dubbing company, maybe Sega didn't have the resources at the time so production was done by 4Kids. 4Kids have their own actors, so perhaps in order to maintain consistency, the 4Kids cast took over voice work for the games too. Once their contract expired, Sega wouldn't have had use of the 4Kids actors (Sonic X) had finished at this point, so they probably decided to get a new voice cast.