WHAT WE TESTTHX engineers complete hundreds of different scientifically-formulated tests to ensure the highest audio visual standards possible. Key tests in this program are as follows:
AXIAL FREQUENCY RESPONSE
This describes a loudspeaker’s ability to reproduce audio accurately. Our test confirms the axial frequency response is balanced and flat.
OUTPUT VS. DISTORTIONThis test ensures the speaker can reach the high volumes necessary to achieve THX Reference Level without creating audible distortion or artifacts.
VERTICAL AND HORIZONTAL DISPERSION
Not everyone gets the middle seat when watching a movie. So we test the off-axis response to make sure it is smooth with no audible comb filtering, making every seat in the room the sweet spot.
THX CERTIFIED PERFORMANCE CLASSES
THX Certified Compact products for smaller sized rooms, up to 1,000 cubic feet in size, with an 8-foot viewing distance from the screen.
THX Certified Select products are for medium-sized rooms, up to 2,000 cubic feet in size, with a 10-12 foot viewing distance from the screen. Previously known as Select2
THX Certified Ultra products bring the cinematic experience to larger home theaters, 3,000 cubic feet in size, with a viewing distance of 12 feet or greater from the screen. Previously known as Ultra2
THX Certified Dominus products are for expansive home theater spaces, 6,500 cubic feet in size, with a 20 foot viewing distance from the screen.