THX certified home theater basic technical indicators
1. There is no seat in the room. The seat of the audience is less than 1 meter away from any wall of the room (except the ground). 2. All audio and video equipment must have THX or THX PM3 certification 3. All doors in the room must be able to be completely closed. 4. After all equipment is started, the noise floor index of the room is lower than the NC25 standard when the air conditioner is turned on. 5. All audience positions in the room must reach 105dB limit undistorted sound pressure level at 1KHz 6. All audience positions in the room must reach 105dB limit undistorted sound pressure level at 40Hz 7. Test Band (Mid Band) = 200Hz – 8kHz. 8. Any position in the room, the frequency response error of the L/C/R channel in the test band cannot exceed +/- 3dB. 9. When the L/C/R channel plays 1KHz signal between each seat, the sound pressure difference does not exceed +/-3dB. 10. For each seat, the 30Hz-200Hz frequency response does not exceed +/-6dB. 11. The 40Hz low frequency sound pressure difference between each seat does not exceed +/-8dB. 12. At any of the audience positions in the room, test the frequency response from each surround speaker with an error of no more than +/- 4 dB. 13. At 1 kHz, the sound pressure difference at each seat of each surround speaker does not exceed +/- 6 dB. 14. In the room, the horizontal viewing angle of each seat must be between 28 and 52 degrees. 15. If you are using a projector, the projection screen must be a THX-certified sound-transparent screen. 16. The brightness of the background of the room should not exceed 3FL during the movie playback. 17. When the movie is playing, there is no light source directly on the screen. 18. If it is a projector front projection system, the screen brightness is at least 14FL; if it is a TV, the screen brightness is at least 35FL. 19. If it is a projector front projection system, the screen ANSI contrast is at least 150:1, if it is a TV, the screen ANSI contrast is at least 200:1.