Audio system is a very important part of home theater. In addition to good visual effects, sound envelopment and accurate sound image positioning are the top priority. Therefore, how to install and configure a home theater audio system becomes particularly important. In the process of setting up a home theater, after you have selected the speakers that suit you, the next task is to carry out a series of tasks such as positioning, installation and debugging of the speakers. Since the home theater system has a set of strict specifications in the installation, placement and adjustment of the speakers, this means that users can only get the ideal sound if they follow these specifications to install and debug the speakers.
Installation of front channel speakers
The front channel consists of two main speakers and a center speaker, referred to as the LCR channel. These three speakers are responsible for most of the sounds in the software. Therefore, it is very important during installation. According to the example of THX, the best way to install LCR speakers is to install the three speakers at the same height and level with the ear height of the listener when sitting down, so as to obtain a better sound field and correct vocal dialogue positioning. . However, the home environment of most consumers does not necessarily have such conditions. For example, consumers who do not use a sound-transparent screen or use a TV cannot install it according to the above method. For these consumers, you can try to install the center speaker on the upper or lower edge of the display device, and then adjust the radiation direction of the speaker. However, one thing we must pay attention to in this approach is that the angle between the installation height of the center speaker and the L and channel-only speakers cannot be as large as 10 degrees, so as not to damage the sound image positioning and sound field of the vocal dialogue.
In addition to the above installation methods, users can also try to install the LCR sound box on the upper or lower edge of the display device at the same time. Then, make the same adjustments to the radiation directions of the three speakers, so that an ideal front sound field can also be obtained.
Surround speaker installation
The surround speakers currently on the market include dipole radiating speakers and traditional direct radiating speakers. For the current 7.1-channel AV system, 4 surround speakers are required. In one case, 4 dipole radiating speakers or 4 direct radiating speakers can be configured, or the side channels can be dipole speakers, and the rear channel can be directly radiating speakers. These speakers also have some specific requirements when they are installed. For example, direct radiating speakers point the radiation direction to the listening position like the front LCR channel. For dipole speakers, the "zero zone" of the speaker needs to be pointed to the listening position. In terms of the installation height of the speaker, according to the example of THX, the installation height is about 1.8m-2.2m, then at this time consumers need to use the speaker bracket to fix the speaker on the wall. Therefore, consumers can buy some suitable speaker brackets to install the speakers at the shop where the rack is sold in the electrical appliance city. If you can't find a suitable bracket, you can consider customizing one according to your own speakers, but the cost will be relatively higher. However, at present, some speaker manufacturers will launch corresponding speaker brackets according to their products when they produce speakers, so as to facilitate consumers to purchase and use. For example, professional manufacturers such as M&K and Genelec have launched corresponding speaker accessories.
Setting and placement of subwoofer
The subwoofer is mainly used to make up for the insufficient low frequency limit of the main speaker. At the same time, it can also play a role in increasing the low frequency energy. Therefore, consumers must set the low frequency crossover point of the AV amplifier before using it. When setting the crossover point, it should be set according to the speaker you choose. For example, when the THX-certified home theater speakers such as M&K and Atlanta are selected, then all the crossover points can be set at 80Hz. As for other speakers, you must set the crossover point of each channel according to the low frequency response of each speaker. After the crossover point is set, you can position the subwoofer. So which position is more suitable for the subwoofer in the room? Because the low frequency below 80Hz is almost non-directional, theoretically, the subwoofer can be placed anywhere in the room. But in fact, consumers need to try to place the subwoofer in different positions in the room for trial listening in order to find a better place. In general, consumers can place the subwoofer in the front.
General commissioning of the speaker system
Finally, talk about the overall debugging of the speaker system. First measure the distance between each speaker and the human ear (usually the distance between the tweeter and the human ear), and input the measured distance value into the AV amplifier. Then the consumer uses a sound pressure meter to measure the output sound pressure of each channel at the listening position, and adjusts the output level of each channel in the AV amplifier independently according to the reading, so that the sound pressure of each channel reaches 80dB reference sound pressure value. Then the speaker setup is basically complete.
After completing the above two steps, in fact, for ordinary consumers of Dahuafen, it can be regarded as completing the basic debugging. But for some consumers who are looking for better results, it is recommended to use an equalizer to correct the frequency response curve of the room. Why is it so open? The main reason is that the frequency response curve of most consumers' listening environment is not ideal. Of course, some people think that adding an equalizer will affect the sound quality, but if the frequency response curve of the room is not ideal, it will seriously affect the overall sound balance, and finally cause the overall sound effect to deteriorate. Therefore, when the listening environment is relatively unsatisfactory, using an equalizer is a good choice.
Before using an equalizer, the first prerequisite is to understand the frequency response curve of your room. At this time, you can find a friend who is engaged in acoustic measurement to help you measure the frequency response curve of the room. Then, make corresponding attenuation or gain on the equalizer according to the room frequency response curve. However, it should be noted that when adjusting the equalizer, it should not be over-adjusted. This is because adjusting the gain of the corresponding frequency band in the equalizer actually increases the output level of a certain frequency. If a certain frequency is adjusted too much gain, it will cause the amplifier to give too much level due to the front end. Burn out, so be careful when adjusting.
The basic installation and setup of home theater speakers have been roughly introduced. However, one more thing to note is that consumers must use their familiar software and make constant adjustments to the speaker system through their actual listening experience, so as to get the desired effect.