Before we introduced the home theater speaker placement, we introduced the ITU-R standard. For details, please refer to the “ITU-R standard surround sound design scheme for home theater speaker placementâ€. THX is a home theater field from the United States. Professional organization, as the world's leading professional research company for home theater, THX's cinema design specification covers different equipment and space for speakers, players, amplifiers, rooms, etc. THX is mainly a standard tailored for home theater. Therefore, it has its own unique features in the home theater speaker system:
In the front three channels, the horizontal angle between the front left and right channels and the listening position is 30-45°, and the left and right channel speakers need to be placed at the center line of the screen, and they are connected to the center channel speaker. Do not exceed 10° between vertical angles. For side surround channels, it is recommended to use a dipole or bipolar mode of operation, placed 90-110° on both sides of the listening position, and at least 60 cm above the human ear. The rear surround does not necessarily need to use a dipole or a bipolar speaker, but to be surrounded by a side level at a level of 135-150°. THX requires the same three models of the front speakers, the low frequency cutoff frequency is 80Hz, and the relatively low frequency part below 80Hz is responsible for the subwoofer.
THX also made clear recommendations on the configuration of the subwoofer. For example, in order to control the low frequency standing wave in the room, THX recommends using multiple subwoofers to solve the problem to create more optimal listening positions. The best effect is to use four identical subwoofers, which are placed in the four corners of the rectangular room. In addition to making the low frequency performance of each position in the room closer, you can get better low frequency power output. THX also recommends placing an ultra-low speaker in the middle of each wall so that the listening area can obtain an extremely low-frequency response, but at the same time, the output sound pressure is much lost. Therefore, it is necessary to configure a subwoofer with a relatively large power. If you can't use 4 subwoofers, you can also use only 2 identical subwoofers in the middle of the front and rear walls or the left and right walls, which can greatly reduce the low frequency standing wave, and the output sound pressure loss is better than the use. 4 less. If it is an ultra-low speaker, it is placed between the LCRs in principle.
According to the speaker arrangement of THX, the layout of the surround sound system is mainly used for movie appreciation. This design idea is quite close to the positioning method in the traditional cinema, so the players and users who like to enjoy the movie are set in the sound field. , can refer to the relevant standards of THX. Of course, this also requires the design of the surround sound system in combination with the actual environment. More home theater knowledge is available in the home theater network, official WeChat: cnhifi.
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