Speaker system layout Basic system layout (For a THX Surround EX system)
The following is an example of the basic layout for a system consisting of eight speaker systems and a television monitor:
Two surround back speakers are required to use the THX Ultra2 Cinema and THX Music modes.
Set the surround back speakers so that the distance to the listening point is the same for both the left and right speakers. It is also recommended that the deviations of the distance from the listening position to L and R channel speakers (front left (FL) and front right (FR), surround left (SL) and surround right (SR), surround back left (SBL) and surround back right (SBR)) is less than 2 ft (60 cm).