Thanks that clears up that misconception
I was always under the perception that THX was just another format that a movie could be offered in, like Dolby Digital, DTS, etc. I know Sound and Vision magazine just did a review on the Star Wars box set, but I left it at work. I thought about waiting on the Star Wars box set, in the hope that they might release a "Directors Edition" like they do on some other movies, with a DTS soundtrack. But I doubt Mr. Lucas will do that, as he's shown no such tendency to do that in the past.