[Home Theater Network HDAV.com.cn] Recently, many friends have found Xiaobian, and consulted all kinds of doubts in the purchase of audio. Here, Xiaobian gathered all the questions.
Q1: "Is the size of the sound related to the sound quality?"
A: The sound quality of the sound can not be judged from a certain aspect. The size of the speaker and the reasonableness of the cabinet, the speaker material, the soundboard component, the speaker material, etc., affect the sound quality in many aspects. As for the size of the volume, it is now a new era of living room theaters, and many brands are making new efforts to create a sophisticated and powerful home theater series.
Q2: Is the speaker power bigger, the better?
A: It is impossible to evaluate whether the speaker is good or bad according to the power of the single speaker. In theory, the greater the power, the better. Because music (referred to as all music) itself has a dynamic range, for example, a dynamic large segment may require several times more power than a dynamic small segment. The power of the amplifier is large and there is sufficient power reserve. More accurate performance. Of course, this is a simple example. There are other complicated reasons. Actually, it is based on your own use and reasonable combination.
Q3: What is the emphasis on audio and amplifier?
A: First of all, pay attention to the power matching problem. In theory, the rated power of the speaker should be equal to the rated output power of the amplifier, so that the equipment can work normally. It is suggested here that it is better to have a big horse-drawn car, and don’t want to drive a small horse. When there are conditions, you can choose a high power amplifier, and definitely do not choose low power. Under normal circumstances, at least the rated output power of the power amplifier should be more than twice the power of the speaker. The big horse-drawn car, although it will cause unnecessary waste of power, but the situation of the small horse-drawn cart, so that the speaker can not get enough power, the entire sound system can not play the best sound. The second is impedance matching. The output of the amplifier and the input impedance of the speaker should also be the same. Although there are some slight deviations between the two, there is no obvious influence on the sound quality, but it will only affect the output power of the amplifier. However, it must be reminded that if the input impedance of the speaker is lower than the output impedance of the amplifier, the distortion will increase significantly. In severe cases, the amplifier will be destroyed. Therefore, everyone still tries to choose the same two. Finally, let's talk about the damping coefficient matching. The so-called damping is a measure of the internal resistance of the output stage of the amplifier for the damping of the speaker. If the damping coefficient is too high, the sound coming out of the speaker will be dry and not round; if it is low, it will easily feel the sound sticking together. Therefore, when you are doing power amplifier configuration, you should pay attention to the damping coefficient of the stone machine is controlled between 30 and 40. The amplifier is high because of its internal resistance, so please do not exceed 10.
Q4: Why is there a sudden noise during the use?
A: Generally speaking, the sound is mostly active speakers, and there must be an amplifier inside, so the noise is inevitable. The noise of the active speakers can be roughly classified into electromagnetic interference, mechanical noise and thermal noise. Electromagnetic interference can be mainly divided into power transformer interference and stray electromagnetic wave interference. Under normal circumstances, the power transformer interference is caused by the leakage of the power of the multimedia speaker. The effect of adding the shield to the transformer is obvious when the conditions permit, and the magnetic leakage can be blocked to the maximum extent. The shield can only be iron. Type material production. We should try our best to choose big brands and solid materials. In addition, using external transformers is also a good solution. Stray electromagnetic interference is common, and speaker wires, crossovers, wireless devices, or computer hosts can be sources of interference. Keep the main speakers as far as possible from the host computer and reduce peripheral wireless devices. In addition to the above equipment, there are many, including speakers, audio sources will have an impact.
Q5: What is the principle of the speaker placement?
A: The general home theater system is a 5.1 package. The so-called 5.1 is two main speakers + two surround speakers + one center speaker + one subwoofer. Then their placement is also very particular.
Center channel speaker placement
The front center speakers are usually placed as close as possible to the center of the image screen. The center channel speaker has the greatest impact on the sound quality of the movie dialogue. In order to ensure that the dialogue is accurately positioned in the center of the screen and the sound is clear, you should use a separate speaker designed specifically for the center channel, instead of using an ordinary bookshelf speaker or TV interior. The speaker is replaced.
Left and right channel main speakers
The placement of these two speakers has a certain relationship with the position of the center channel speaker. In order to ensure the smoothness of the left and right movement of the sound image, they should be placed on both sides of the center channel speaker, and the three speakers should be at the same distance from the position of the best listener in front of the screen. In general, the center speaker should be placed a little longer than the left and right speakers until the sound field can be completely combined to create a truly unified sound image. The distance of the back is related to the size of the space, the listening position and the speakers used, which can be determined by experiment.
Surround channel speaker placement
The arrangement of the loop speakers should be different depending on the listening environment (room conditions) and the type of loop speakers. The speakers of the left and right surround channels should be more diffuse than the directional, which is beneficial to create a rich atmosphere. Surrounding atmosphere. When placing dipole-type speakers, we must consider two factors: resonance and self-fading. The best anti-resonance is 20% of the indoor space from the ceiling (or ground) (such as indoor height) 2.5m, the best position is 50cm above and below). In order to make the frequency response smoother, a new device called low frequency "trap" (absorbing low audio) can be added to eliminate the reflection that causes the sound to decay.
Subwoofer placement
Usually put the subwoofer near the front corner, preferably more than 1m from the corner, which can reduce the interference of standing waves. You can also put the subwoofer on both sides of the best listening position, keep the proper distance, because people The ear is not sensitive to the directionality of the subwoofers from both sides, so the subwoofer will not interfere with the original sound image localization of the front three channels. Of course, the best placement position should be determined by experiment. For more fresh and fun home theater information, please pay attention to the home theater network http:// (WeChat: cnhifi), the country's most influential home theater audio player interactive media website.
Note: This article is transferred from Snail Sound. The article is an independent view of the author and does not represent the position of the home theater network.
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