Although in 5.1 sound systems there is a discrete channel for the low frequencies – LFE (subwoofer), low frequencies can still exist in the left, center, and right channels, depending on the soundtrack.
In order for your speakers to faithfully reproduce the sound field, your speakers must all be wired the same way (or in-phase).
This test verifies that the speaker channel assignments are correct for a 5.1-channel or 7.1 sound system (left output from the receiver is going to the left speaker, center output to the center speaker, etc.) and that the audio output is balanced.
This section of the THX Optimizer testing process will play a selected scene from the movie if available.
This test looks similar to the 4:3 Aspect Ratio test, but the 16:9 Aspect Ratio test pattern is used to make sure that your DVD player is set to the proper display mode.
The 4:3 aspect ratio circle and boxes will determine your video monitor’s alignment for a 4:3 aspect ratio display.
This procedure is designed to let you optimize the way the overall television/monitor’s picture resolution looks.
Color and Tint (also known as “hue”) settings work together to create the correct color imaging for the picture.
For the brightness test, THX Optimizer provides a signal that displays two bars containing ten shades of black at the top and bottom of the screen, the THX logo, and a drop shadow behind the THX logo.