THX Ultrasound Speaker

THX Ultrasound Speakers were a type of speaker found at Hologram Fun World, where they played music throughout the park. There were 1,138 of them installed.

Behind the scenes
The type and number of speakers is a reference to George Lucas' first film, THX-1138. It may also be a reference to THX sound certification, named after the film as well.

Appearances

 * Queen of the Empire