With the increasing demand for social audio-visual entertainment, people have put forward higher requirements for the "hearing sense" of the sound system. Ordinary consumers often achieve the goal of improving the "hearing" by replacing and upgrading the speakers. Especially for some speaker enthusiasts, they have invested thousands of dollars into the sound system to improve the system sound quality. However, just when people are thinking about spending more money on better speakers, they ignore the problem of speaker placement.
The difference in the placement of the speakers will directly affect the balance of the sound, the depth of the sound field and the surround sound and the effect of the subwoofer. The correct and effective placement method helps to optimize the sound effects of the speakers, and achieves the goal of “upgrading” the speakers without spending a penny.
1. The correct placement of the speakers According to the acoustic environment of the room (such as the size of the room, the closure of the room and the decoration), the placement method of the speakers will be different, so you can try different kinds of speaker systems. Place the method until you feel the best sound.
Judging from the channel structure of the current speaker, there are roughly 2.0 bookshelf stereo and 2.1, 4.1, 5.1, 7.1 and other X.1 channel speakers, and their respective corresponding speakers have 2, 3, 5, 6 8, 8 points. In this way, how to correctly place them and make them "sounds of nature" according to your wishes is not a simple or even negligible thing. Especially for multi-channel speaker systems, its main purpose is to establish an accurate and complete sound field for sound positioning, which is a basic requirement for PC theater, and the purpose of achieving the goal depends on the correct placement of the speaker. .
There are also a variety of methods for placing speakers. For example, there is a "professional" pendulum method recommended by Dolby Laboratories. There are seven typical typical room space pendulum methods, namely, the so-called axial medial method, the equilateral triangle method, the 317 proportional method, the trinity ratio method, and the long after Wall pendulum method, wall pendulum method and diamond pendulum method. Below I will follow the current speaker channel structure type, combined with these common speaker placement methods for a common explanation.
(1) The most typical layout of the bookshelf 2.0 speakers is the “odple triangle method”. This pendulum method requires that a pair of speakers be arranged facing the listener, placed on both sides of the display, and two speakers. The distance between them should be 1.5~2 meters. Note that the speaker should be separated from the rear wall and the side wall by a certain distance (20~50cm or more), because the inverted hole of the general 2.0 speaker is rear. If the speaker is close to the back wall, the sound wave in the inverted hole cannot be When fully released, the effect of the sound field will be greatly reduced. Some speakers must rely on the reflection, superposition and mixing of the wall to have a better bass effect. The speaker should not be too close to the side wall, in case the reflection of the side wall changes the direction and intensity of the sound wave and affects the sound quality. Then make the speaker and the listener form a 45° angled triangle, and try to make the three on the same plane. The listener sits on the so-called “emperor position” to get the best listening position and playback sound. This regular triangle can be large or small, except for the angle. When the room is small and the power of the rear stage is not large, the square is smaller; when the room is large and the power of the rear stage is large, the triangle can be enlarged.
Because of this placement method, the listener is more than one meter away from the speaker while listening, and the listener cannot sit on the "emperor position" like the Hi-Fi speaker user, so the "triangular method" Also known as the semi-free near sound field. Its advantage is that it can reduce the excessive interference of the four walls of the reflected sound on the direct sound of the speaker, and can get a good positioning feeling and a wide and deep sound field. It is a kind of pendulum that can hear the most, the most direct and the clearest details.
(2) X. The basic arrangement of type 1 multi-channel speakers is 2.1, 4.1, 5.1, 7.1 and other X.1 channel speakers. Let's first talk about the concept of the ".1" channel they share. Take the Dolby Digital 5.1-channel system as an example. In addition to providing surround sound for five full-band channels—left, center, and right channels, and left and right surrounds, there is a sixth channel, the low-frequency effect. Channel. This channel provides a stunning subwoofer effect with a bandwidth that is only one-tenth of the audible frequency range (ie one tenth of the other channel bandwidth), hence the “.1” channel. The corresponding speaker is a subwoofer (commonly known as a subwoofer).
For the placement of the subwoofer, there is no rigid regulation in theory, because the human ear is not sensitive to the orientation of the bass, that is, the bass is basically not directional or the directivity is not strong, so the subwoofer can be placed anywhere in the room. One part, but in fact only the real AV subwoofer can do this. The subwoofer of a typical multimedia speaker has an upper limit of at least 300 Hz or even 3000 Hz. Many of the low frequency frequencies are emitted from the subwoofer, so it is recommended to place the subwoofer under the computer desk. The position directly below the display, that is, the ground on the same line as the front and front channels of the listener, can achieve better results. If the subwoofer has a lateral or backward phase reversal hole, it should be placed facing the wall and at a distance from the wall to enhance the bass.
For 4.1 channel speakers, it only adds two surround back speakers to the 2.1 speakers to enhance the positioning and surround sound. For surround speakers, it is generally recommended to lie on the left and right sides of the listener's main seat position, facing up in a face-to-face manner, that is, directly facing the listening area and facing the listener. The height of the erection is about 60~90 cm above the head when the listener is sitting, or it is hung on the left rear and right 180cm wall of the listener according to Dolby Laboratories, which helps to reduce the positioning effect. Impact. In general, it is best to be symmetrical with the user's central axis and not more than 1.5 meters from the user. You can also adjust the orientation and angle of the speaker at any time according to your needs, instead of hanging it on the wall to achieve the best audio-visual effect. If this solution does not work, it can also be hung on the rear wall, the height is still maintained, face to face or face forward; if there is no wall near the listener for hanging speakers, you can use the speaker stand or small The table is used instead of the wall installation method, and is placed on the left and right sides of the listener in a face-to-face manner. It is not possible to place the speaker on the ground on both sides of the listener, but it is better to raise it slightly to the ground and tens of centimeters. The speaker is facing up.
The 4.1-channel speaker placement diagram creates a diffuse, highly enveloping sound field in the listening area, just like the sound field in a movie theater and dubbing room. If the surround speaker position is too far forward, you will not get enough backwards. If the surround speaker position is too far back, the integration and surround information will be less integrated with the entire sound field.
For 5.1-channel speakers, it adds a center-channel center speaker to the 4.1 speakers, specifically for playing movie dialogues and vocals. For the center speaker, you can place it on the top of the monitor or on the desktop in front of the monitor, and ask it to line up with the two main speakers on the front facing the listener, on the same plane and at the same height as possible. The center speaker can be moved a little later, but the front side is still parallel to the front of the front main speaker, so that satisfactory sound playback can be achieved. If the frame is too high, the sound will appear to be pressed from above. If it is too low, the dialogue will be dwarfed.
5.1 speaker layout diagram and for the current trend of 7.1-channel speakers, there are two more surround speakers than 5.1 speakers. Its appearance makes the sound field of computer sound tend to be complete, the sound positioning is more accurate, and the layering is more distinct. The placement of the 7.1-channel speakers can be performed separately in the manner described above, with a focus on the four surround speakers. It can be placed or hung on the left front, left rear, right front, and right rear sides of the listener (on the wall or on the speaker stand), facing the listener and placed face to face, and the height of the erection is higher than the listener. When sitting in a position of 60 to 90 cm above the head, make sure that the two speakers on the left and the two speakers on the right are on the same line. In addition, the left front and right front surround speakers should be in a plane perpendicular to the listener and the computer screen, and in the same plane as the rear pair of surround speakers. In this way, with the right placement, you can experience the unprecedented shock and immersive feeling of the new 7.1-channel speaker.
7.1 Speaker layout diagram In addition, in the placement and use of the speaker, we must also pay attention to prevent the occurrence of standing waves and avoid the resonance of the cabinet. Among them, the resonance of the cabinet, that is, the speaker is placed on the computer desk, the vibration generated by the table when the volume is turned on, the louder the volume, the more obvious the resonance. Hi-Fi speakers are overcome with a dedicated stand, while multimedia speakers use rubber feet to reduce resonance. If the effect is not satisfactory, try to solve the problem by pressing a coin or a sponge on the speaker's four-foot pad and pressing a heavy object such as a book on the box.
2, the matching of the room and the speaker In addition to the correct placement, the sound effect of the speaker is also deeply affected by the acoustic effect of the room, which includes the matching of the room size and the power of the speaker, the relationship between the building structure and the sound effect of the room, etc. .
(1) Relationship between the building structure and the sound effect of the room After purchasing the speaker with the matching power and room area, pay attention to the building environment factors of the room that affect the sound quality of the speaker, including the height of the house, the shape of the room, and the interior decoration. The corners are vacant and so on.
As mentioned above, the listening effect indoors and in the wild is completely different. The former is much stronger than the latter. This is because of the good listening environment in the room, that is, the sound is generated by the wall and space of the house. The effects of reflection, reverberation, etc., the bass part of the sound will be strengthened, making the sound more sturdy and contagious, in order to get better playback. A typical example is that the closer a speaker is to the wall and wall, the wall and the top, and the wall at the junction, the stronger the bass output will be. Of course, those speakers with inverted apertures should not be placed too close to the wall when they are placed, because the sound waves in the inverted holes cannot be completely released. The vibration is only the part of the wall, not the whole of the wall. The sound field effect is not good. . Therefore, the sound quality of the speaker is inseparable from the structural environment of the room.
In general, the room that is most conducive to listening is about 15 to 20 square meters, and the floor height is 2.8 meters or more. The shape of the room is rectangular and irregular, and the interior is slightly chaotic and the corners are small. The worst case is that the room is only 5 square meters or less, the floor height is 2.4 meters or less, the room shape is extremely narrow or curved, the room is decorated with large-area glass or smooth products, and the empty corners are many and square. This is because the room is large enough to facilitate the reasonable placement and sound effects of the speaker. The roof is high enough to make the sound field more stereoscopic and deeper, while the rectangular and appropriately irregular room is chosen to avoid adding echo. , causing sound staining. Excessively exposed surfaces can cause reflections, making the sound harsh, or making the dialogue ambiguous. So a slightly messy room is good for listening, and things can often absorb unwanted sound reflections, bringing the room closer to the correct reverberation index.
Acoustic-treated rooms can also take appropriate remedies for rooms that are poorly listening. For example, avoid choosing rooms that are completely square, or rooms that are twice the length of the other side; abandon multimedia speakers to use high-fidelity headphones; use chandeliers, ornaments, etc. to try to make the roof irregular and improve its top reflection; try to lay Blankets or curtains, hanging cotton products to control the effects of reflections; stacking debris or sound-absorbing materials in the corners or making the corners irregular by furniture. These measures can better compensate for the impact of the poor listening environment and the sound effects of the speakers to a certain extent.
(2) Matching room size and speaker power Normally, one problem to consider when purchasing a speaker is the matching of the speaker power to the room size. If the two are properly matched, the sound effects of the speakers will reach the desired ideal level. The kind of small room with high-powered speakers, or large rooms with small power speakers, will have a bad effect on the playback sound of the speakers, which are not sensible "acts." This situation is like we usually take a radio, the different sound effects heard in the bathroom, large living room and outdoor are similar. Therefore, a good speaker must have a good environment to produce a good sound.
Nowadays, because many families and individuals have different situations, the rooms for computers/speakers are large and small, ranging from 10 to 20 square meters or even 25 square meters. The above "big family" people. In this way, we can match the speakers of different power according to the size of the room. In these programs, for the "dwelling room" below 10 square meters, it is generally recommended that you use high-fidelity headphones, 10W ~ 30W micro 2.0, micro 2.1 speakers, those 4.1 / 5.1 speakers are too crowded to be placed, It is difficult to achieve the desired results, of course, it is not suitable for purchase.
Rooms with a size of more than 10 square meters, especially in the range of 15 to 25 square meters, should be the more common type, so the matching schemes are also the most common. The 30W~100W, medium and large 2.0 and X.1 speakers on the market can be purchased according to their actual needs. Most of these speakers are well-designed, power-rich, cost-effective, and have good musical performance. Whether it is music enthusiasts, gamers, or PC theater fans, most of them can be satisfied;
For those "big family" who are more than 25 square meters, the speakers that are suitable for matching with them are required to be around 100~500W. There are only a handful of such domestic speakers on the market, only the Swans T200A (2.0) and Logitech's Z- Several products are available, such as 680 (5.1). If you have enough pockets, imported high-power multimedia speakers that have advantages in circuit design and unit quality can also be considered.
In addition, there are volume adjustments and "downtime" issues that affect the sound quality of the speakers. The so-called volume adjustment is to adjust the volume of all the speakers until the listener feels that the volume of each speaker is equal in the seat. This is a very important step, especially for PC theater systems with surround speakers and precise 3D positioning requirements, which is one of the key factors in determining whether they can get a stunning sound. When tuning, you can follow the size of the listening space, the distance between the listener and the speaker, and combine the speaker manual to be patient.
The so-called "downtime" problem is similar in nature to the "run-in" of the new car. After the speaker is bought, it is allowed to continue working with a large power to achieve complete stretching of the diaphragm of the speaker and rapid aging of the circuit. The purpose of the box seam is stable, and finally the sound quality of the speaker reaches the best level that can be achieved. The "downtime" time can be grasped by the situation, generally in the 70~100 hours.

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