There is something foggy about THX setting of sub. All five (seven) speakers must bu cut of at 80Hz. OK. All the bass goes to the sub. Sub must be set at 80Hz (THX) position. Am I right? But the LFE channel consist of more bass to the 120 Hz. Here is: From DOLBY.com: The sound information contained in each of the six available channels is distinct and independent. These six channels are described as a "5.1-channel" system, because there are five full-bandwidth channels with 3 Hz to 20 kHz frequency range for Front Left and Right, Center, and Surround, plus one "Low Frequency Effects" (LFE) subwoofer channel devoted to frequencies from 3 to 120 Hz. Where goes exra bass from LFE channel 80-120Hz? Or I'm getting something wrong.