THX certification only means that the gear meets a certain set of standards. There's no magic about it, and your THX movies will not sound better on THX gear vs. non-THX gear. THX is a marketing tool, that's it. Companies pay big bucks to have those three letters on their equipment, because the marketers have done a good job of duping the public into thinking that "THX-certified" is worth more money. It isn't. It just means the gear passed the minimum THX standards. Most gear pass the standards anyway. For non-THX gear, the companies just chose not to pay the money to have the badge. Trust me, you will not hear the difference.