THX (Score 1)

You are partially correct. THX is a certification given to A/V electronics that adhere to a minimum of standards regarding such things as signal quality, power, and other goodies - depending on the type of equipment (i.e. speakers or amps, etc.) THX certification does not have anything to do with listening to two different sources in two different rooms.

Side note Dolby labs spearheaded the THX certification movement.