File:THX Grand Prototype Variant.png.png

the Prototype variant exists. Here are the differences:

1. "This auditorium is equipped with the THX Sound System" but the word "with a" replace "with the" and is all in caps. 2. The Word "The Audience Is Listening" is replaced "The Audience is Listening..." 3. The 3D THX Logo is a Prototype Print logo.