Sofa Butler Home Theater Getting Started What is a 5.1-channel home theater? "5" refers to 5 speakers, ".1" refers to a subwoofer, 5.1-channel home theater means from the front left, right channel (speaker), rear left and right surround channels ( Speaker), center channel (speaker) and a subwoofer, a total of six speakers (speakers) consisting of home theater sound system. It can bring us unrivalled 3D sound effects, so that wonderful music is tightly around you.
5.1-channel home theater
How to set up a 5.1-channel home theater?
Since the effect of 5.1-channel home theater is so good? Of course, many of my friends also want to set up a team, but what exactly should we do?
First of all, you have to choose a brand, for example, the British (monitor audio) card, TANNOY, Harman/Kardon, Dynaudio, M&K Sound, USA Jayce. These brands are among the best in audiophile audio brands and the first choice for the formation of 5.1-channel systems.
After selecting the brand, we need to purchase specific equipment. At this time, you need to pay attention to the box work, sound effects, speaker units, power amplifiers and other aspects.
1, from the box, the box material is generally divided into two kinds of plastic and wood. When the low-grade plastic box is working, it is easy to produce the resonance of the box. When the sound is played, there is severe sound dyeing, especially when the dynamics are large. It is worth noting that some of the poor speakers currently on the market are only covered with a veneer pattern on the surface and the interior is still plastic. Users should pay more attention to it, and be careful when judging, knocking, licking, and listening.
2, from the speaker point of view, computer speakers are generally used to film, silk film and other soft ball top to do the tweeter, the top of the ball of different materials have different frequency characteristics, can show different timbres, can be described as their merits. The quality of the woofer is even more important. It directly affects the overall performance of the speaker. The performance of the subwoofer mainly depends on the caliber, cone material, and magnets.
In general, the louder the bass speaker is, the better the low frequency performance of the speaker. Subwoofer cone cones also have a variety of materials, such as paper cones, bulletproof pots, wool woven basins, polypropylene pots and so on. Cone bowls of different materials can perform different timbres. The speaker's magnet is closely related to the power of the speaker. Only by providing a stronger magnetic field for the voice coil can a higher electro-acoustic conversion efficiency be achieved. ?
3, from the power amplifier point of view, power amplifier performance indicators mainly in the output power and distortion. Usually speakers with an RMS power of about 15W can produce very good dynamics and low frequencies; the distortion value is usually as small as possible, and should be less than 0.5% in general, while the distortion of the subwoofer is allowed to be slightly larger but not larger than 5%, the above parameter products are clearly marked.
Here I also want to specifically remind the following: Some businesses in the recommendation of products to users, repeatedly stressed the maximum power of the product, in fact, this power is only achieved in an instant, not too much substantive significance for the user.
In order to experience the perfect 5.1-channel home theater, in addition to having a very good device, it also needs to be properly positioned, and only in this way can we create high-quality sound effects. So next we will take a look at how the 5.1-channel home theater is set up.
How to place a 5.1-channel home theater
1, the placement of speakers
In a 5.1-channel home theater display, 5 full-range channels (5 speakers) and one subwoofer (ie subwoofer) are equidistant to the listener, left, right, and listener An equilateral triangle is formed. The center channel is centered on the listener and has a left and right channel radius. The surround channel is 110 degrees behind the listener and the speaker is facing the listener. Please pay attention to each speaker's attention.
1) Placement of center channel speakers
The center speaker is usually placed as close as possible to the center of the image screen. The center channel speaker has the greatest influence on the sound quality of the movie dialogue. To ensure that the dialogue is accurately positioned at the center of the screen and the sound is clear, a separate speaker designed for the center channel should be used instead of the ordinary bookshelf speaker or the TV. The speaker comes instead.
Most of the center channel speakers use horizontal horizontal cabinets. The best place for them is the top of the TV (if the front projection display screen is placed behind the screen), it should be as close as possible to the screen. If room space is limited, a more economical arrangement can be used, ie no center speaker is provided.
At this time, the work mode of the AV amplifier should be placed in the "phantom" center channel mode, so that the center channel information from the left and right speakers in a balanced release, the sound image is exactly in the center of the screen, which for small listening Room is suitable. Of course, it's best to set up a center speaker.
2) Place the main speakers
The placement of these two speakers has a certain relationship with the position of the center channel speakers. In order to ensure the smoothness of sound image left and right movements, they should be placed on both sides of the center channel speaker respectively, and the three speakers should be kept at equal distances from the best listeners in front of the screen. In general, the center speaker should be positioned a bit behind the left and right speakers until the two sound fields can be completely combined to create a truly unified sound image location. The distance of retreat depends on the size of space, listening position and speakers used. It can be determined by experiment.
In addition, the vertical height of the left and right channel speakers is preferably not higher or lower than the center speaker's axis of 0.3m (preferably slightly lower), otherwise the left, center, and right The difference in the height of the speakers is too great, and the sound image of the front will give a feeling of jumping like a sound when it is shifted laterally. Floor-standing speakers usually meet these requirements. If bookshelf speakers are used as left and right speakers, they should be fixed on the speaker stand so that it is highly consistent with the above requirements.
The distance between the left and right main speakers leaving the screen depends on the size of the screen. If you use large and medium screen color TVs in small rooms, the left and right channel speakers can be located on both sides of the screen. If the screen is small, you can make them a little further from the screen to get a wider stereo field. But don't go too far away from the screen, so as not to give false impressions because the position of the sound image is too far away from the screen. From this point of view, there is a deficiency of "congenital" - the environment is too small.
To sum up, the sounds of the left, middle, and right channels have more directivity than diffusivity. That is, the radiation angles of these three channels should be oriented toward the best listening position. This will reduce the impact of reflected sound from floors, walls and roofs, and ensure proper sound image localization.
3) Placement of surround speakers
The placement of loop speakers should vary depending on the listening and listening environment (room conditions) and the type of ring speaker. Speakers that surround the two channels in the left and right surrounds should have more diffuse sound than directionality, which is conducive to creating a rich surrounding atmosphere. When placing dipole speakers, it is important to consider two factors: resonance and self-decay. The best position for anti-resonance is 20% of the indoor space height from the ceiling (or floor) (if the indoor height is 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 reflections that cause the sound to decay.
For direct radiating loop speakers, there are many layout options that can be considered. For example: fixed on both sides of the wall and point them to the rear corner; fixed on the rear wall, so that they open outwards and upwards in an inverted figure eight and toward the junction between the side wall and the ceiling; placed on both sides against the wall On the floor and pointing upwards at the junction of the wall and the ceiling, and so on. Many other options can be designed based on the specific conditions of the room. The surround sound field of a home theater is mainly based on the acoustic reflection and refraction of the surround speakers in the room's various acoustical surfaces. The room acoustic conditions vary from room to room. As long as patient tests are conducted and comparisons are made carefully, the best placement can be found. Program.
2, subwoofer placement
Because the human ear is not sensitive to the directionality of bass, it can be placed at the corner. But this time, we must pay attention to two points: First, the subwoofer must not be placed on objects that easily form resonance, such as a light-weight computer desk. Once this is done, when the subwoofer is working, the table is also shaken, which has a great impact on the sound quality. Second, the back of the subwoofer must not stick tightly to the wall. This is because many subwoofers are designed after being inverted. The inverted hole is backwards, if there is no certain distance, it will not play bass. Therefore, at least a distance from the wall is also required.
5.1-channel home theater
How to set up a 5.1-channel home theater?
Since the effect of 5.1-channel home theater is so good? Of course, many of my friends also want to set up a team, but what exactly should we do?
First of all, you have to choose a brand, for example, the British (monitor audio) card, TANNOY, Harman/Kardon, Dynaudio, M&K Sound, USA Jayce. These brands are among the best in audiophile audio brands and the first choice for the formation of 5.1-channel systems.
After selecting the brand, we need to purchase specific equipment. At this time, you need to pay attention to the box work, sound effects, speaker units, power amplifiers and other aspects.
1, from the box, the box material is generally divided into two kinds of plastic and wood. When the low-grade plastic box is working, it is easy to produce the resonance of the box. When the sound is played, there is severe sound dyeing, especially when the dynamics are large. It is worth noting that some of the poor speakers currently on the market are only covered with a veneer pattern on the surface and the interior is still plastic. Users should pay more attention to it, and be careful when judging, knocking, licking, and listening.
2, from the speaker point of view, computer speakers are generally used to film, silk film and other soft ball top to do the tweeter, the top of the ball of different materials have different frequency characteristics, can show different timbres, can be described as their merits. The quality of the woofer is even more important. It directly affects the overall performance of the speaker. The performance of the subwoofer mainly depends on the caliber, cone material, and magnets.
In general, the louder the bass speaker is, the better the low frequency performance of the speaker. Subwoofer cone cones also have a variety of materials, such as paper cones, bulletproof pots, wool woven basins, polypropylene pots and so on. Cone bowls of different materials can perform different timbres. The speaker's magnet is closely related to the power of the speaker. Only by providing a stronger magnetic field for the voice coil can a higher electro-acoustic conversion efficiency be achieved. ?
3, from the power amplifier point of view, power amplifier performance indicators mainly in the output power and distortion. Usually speakers with an RMS power of about 15W can produce very good dynamics and low frequencies; the distortion value is usually as small as possible, and should be less than 0.5% in general, while the distortion of the subwoofer is allowed to be slightly larger but not larger than 5%, the above parameter products are clearly marked.
Here I also want to specifically remind the following: Some businesses in the recommendation of products to users, repeatedly stressed the maximum power of the product, in fact, this power is only achieved in an instant, not too much substantive significance for the user.
In order to experience the perfect 5.1-channel home theater, in addition to having a very good device, it also needs to be properly positioned, and only in this way can we create high-quality sound effects. So next we will take a look at how the 5.1-channel home theater is set up.
How to place a 5.1-channel home theater
1, the placement of speakers
In a 5.1-channel home theater display, 5 full-range channels (5 speakers) and one subwoofer (ie subwoofer) are equidistant to the listener, left, right, and listener An equilateral triangle is formed. The center channel is centered on the listener and has a left and right channel radius. The surround channel is 110 degrees behind the listener and the speaker is facing the listener. Please pay attention to each speaker's attention.
1) Placement of center channel speakers
The center speaker is usually placed as close as possible to the center of the image screen. The center channel speaker has the greatest influence on the sound quality of the movie dialogue. To ensure that the dialogue is accurately positioned at the center of the screen and the sound is clear, a separate speaker designed for the center channel should be used instead of the ordinary bookshelf speaker or the TV. The speaker comes instead.
Most of the center channel speakers use horizontal horizontal cabinets. The best place for them is the top of the TV (if the front projection display screen is placed behind the screen), it should be as close as possible to the screen. If room space is limited, a more economical arrangement can be used, ie no center speaker is provided.
At this time, the work mode of the AV amplifier should be placed in the "phantom" center channel mode, so that the center channel information from the left and right speakers in a balanced release, the sound image is exactly in the center of the screen, which for small listening Room is suitable. Of course, it's best to set up a center speaker.
2) Place the main speakers
The placement of these two speakers has a certain relationship with the position of the center channel speakers. In order to ensure the smoothness of sound image left and right movements, they should be placed on both sides of the center channel speaker respectively, and the three speakers should be kept at equal distances from the best listeners in front of the screen. In general, the center speaker should be positioned a bit behind the left and right speakers until the two sound fields can be completely combined to create a truly unified sound image location. The distance of retreat depends on the size of space, listening position and speakers used. It can be determined by experiment.
In addition, the vertical height of the left and right channel speakers is preferably not higher or lower than the center speaker's axis of 0.3m (preferably slightly lower), otherwise the left, center, and right The difference in the height of the speakers is too great, and the sound image of the front will give a feeling of jumping like a sound when it is shifted laterally. Floor-standing speakers usually meet these requirements. If bookshelf speakers are used as left and right speakers, they should be fixed on the speaker stand so that it is highly consistent with the above requirements.
The distance between the left and right main speakers leaving the screen depends on the size of the screen. If you use large and medium screen color TVs in small rooms, the left and right channel speakers can be located on both sides of the screen. If the screen is small, you can make them a little further from the screen to get a wider stereo field. But don't go too far away from the screen, so as not to give false impressions because the position of the sound image is too far away from the screen. From this point of view, there is a deficiency of "congenital" - the environment is too small.
To sum up, the sounds of the left, middle, and right channels have more directivity than diffusivity. That is, the radiation angles of these three channels should be oriented toward the best listening position. This will reduce the impact of reflected sound from floors, walls and roofs, and ensure proper sound image localization.
3) Placement of surround speakers
The placement of loop speakers should vary depending on the listening and listening environment (room conditions) and the type of ring speaker. Speakers that surround the two channels in the left and right surrounds should have more diffuse sound than directionality, which is conducive to creating a rich surrounding atmosphere. When placing dipole speakers, it is important to consider two factors: resonance and self-decay. The best position for anti-resonance is 20% of the indoor space height from the ceiling (or floor) (if the indoor height is 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 reflections that cause the sound to decay.
For direct radiating loop speakers, there are many layout options that can be considered. For example: fixed on both sides of the wall and point them to the rear corner; fixed on the rear wall, so that they open outwards and upwards in an inverted figure eight and toward the junction between the side wall and the ceiling; placed on both sides against the wall On the floor and pointing upwards at the junction of the wall and the ceiling, and so on. Many other options can be designed based on the specific conditions of the room. The surround sound field of a home theater is mainly based on the acoustic reflection and refraction of the surround speakers in the room's various acoustical surfaces. The room acoustic conditions vary from room to room. As long as patient tests are conducted and comparisons are made carefully, the best placement can be found. Program.
2, subwoofer placement
Because the human ear is not sensitive to the directionality of bass, it can be placed at the corner. But this time, we must pay attention to two points: First, the subwoofer must not be placed on objects that easily form resonance, such as a light-weight computer desk. Once this is done, when the subwoofer is working, the table is also shaken, which has a great impact on the sound quality. Second, the back of the subwoofer must not stick tightly to the wall. This is because many subwoofers are designed after being inverted. The inverted hole is backwards, if there is no certain distance, it will not play bass. Therefore, at least a distance from the wall is also required.
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