Home theater audio debugging precautions and speaker installation

Home theater audio debugging precautions and speaker installation

The audio system is a very important part of the home theater. In addition to good visual effects, sound envelopment and accurate sound and image positioning It is the top priority! Next, I will tell you about home theater audio debugging precautions and speaker installation, come and take a look!

Surround speaker installation< /p>

Surround speakers currently on the market include dipole radiating speakers and traditional direct radiating speakers. For current 7.1-channel AV systems, 4 surround speakers are needed. In one case, you can configure 4 dipole radiating speakers or 4 direct radiating speakers, or use dipole speakers for the side channels and direct radiating speakers for the rear channels. These speakers also have some specific requirements when installing them. For example, direct radiation speakers point the radiation direction to the listening position like the front LCR channel, while dipole speakers need to point the "zero zone" of the speaker to the listening position. In terms of the installation height of the speaker, according to THX's example, the installation height is about 1.8m-2.2m, so at this time consumers need to use the speaker bracket to fix the speaker on the wall. Therefore, consumers can go to the rack-selling store in the electrical city to buy some suitable speaker brackets to install the speakers. If you can't find a suitable stand, you can consider custom-making one according to your own speaker, but the cost will be relatively high. However, some speaker manufacturers now launch corresponding speaker stands according to their products when producing speakers to facilitate consumers' purchase and use. For example, professional manufacturers such as M&K and Genelec have launched corresponding speaker accessories.

Setup and placement of subwoofer speakers

Subwoofer speakers are mainly used to make up for the lack of low-frequency lower limit of the main speakers. At the same time, they can also increase the low-frequency energy. role. Therefore, consumers must set the low-frequency crossover point of the AV amplifier before use. When setting the crossover point, it should be set according to the speaker you choose. For example, if you choose home theater speakers with THX certification such as M&K and Atlanta, you can set all crossover points to 80Hz. As for other speakers, you must set the crossover point for each channel based on the low-frequency response of each speaker. After the crossover point is set, the subwoofer can be positioned. So where is the most suitable position for the subwoofer in the room? Since low frequencies below 80Hz are almost non-directional, in theory, the subwoofer can be placed anywhere in the room. But in fact, consumers need to try placing the subwoofer in different locations in the room to listen to it to find the best placement point. Under normal circumstances, consumers can place the subwoofer in the front.

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 sound in the software. Therefore, it is very important during installation. According to THX's example, the best way to install LCR speakers is to install the three speakers at the same height and at the same height as the listener's ears when sitting, so as to obtain the best sound field and correct vocal dialogue positioning. . However, the home environment of most consumers does not necessarily meet such conditions. For example, consumers who do not use sound-transparent screens or use televisions cannot install according to the above method. For this group of 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 that must be paid 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 more than 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 LCR channel speakers 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 be obtained.

Overall debugging of the speaker system

Finally, let’s talk about the overall debugging of the speaker system. First, measure the distance between each speaker and the human ear (generally based on 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 at the listening position to measure the output sound pressure of each channel, and based on the readings, the output level of each channel in the AV amplifier is independently adjusted so that the sound pressure of each channel reaches Reference sound pressure value of 80dB. Then the speaker setup is basically complete.

After completing the above two steps, in fact, for ordinary consumers in Dachafen, basic debugging has been completed. However, for some consumers who pursue better results, it can be recommended to use an equalizer to correct the frequency response curve of the room. Why is it so wide? Mainly because the frequency response curve of most consumers' listening environment is not ideal. Of course, some people think that adding an additional 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 ultimately lead to a deterioration of the entire sound effect. Therefore, using an equalizer is a good choice when the listening environment is relatively less than ideal.

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, do not overdo it. This is because adjusting the gain of the corresponding frequency band in the equalizer actually increases the output level of a certain frequency. If too much gain is adjusted at a certain frequency, the amplifier will be damaged due to the excessive level given by the front end. burn out, so be careful when adjusting.

Tips: Use software you are familiar with and constantly adjust the speaker system based on your actual listening experience, so that you can get the ideal effect. ;