Home theater speakers, also known as AV speakers, are distinguished from high-fidelity (HiFi) speakers. Both AV speakers and HiFi speakers should meet the minimum performance requirements of high-fidelity speakers. Speakers are subjective evaluation of the equipment with strong color, so it is difficult to grasp the fans when purchasing. The purchasing techniques provided in this article focus on practical and operable, and hope to enhance the fans' awareness of cinema equipment.
1. Pay attention to the difference between the speaker diaphragm material:
For home theater speakers, there are many forms, including main speakers, center and surround, etc. First, the sound of each channel speaker is required to be unified. The tone is a comprehensive reflection of the characteristics of the speaker, requiring the average consumer to effectively grasp the difficulty. Generally speaking, the material of the speaker diaphragm is different, and the effect on the tone is obvious.
The materials of the cone diaphragm mainly include ordinary paper cones, wool-filled pots, surface-sprayed resin paper pots, PP pots, carbon fiber woven pots and fiberglass pots. Ordinary paper cones are widely used and inexpensive, and their tone is basically neutral. The defect is that the middle and high sections of the frequency response are difficult to handle when frequency division, and the appearance is limited. The woolen paper cone is round and mellow, giving a warm feeling. The paper cone coated with resin material has a change in appearance, and the tone performance tends to be slender. The fiber woven basin has large internal damping, flat response, and easy to cross-connect, but the price is more expensive, and the bass processing is not good, there will be a hard and tight subjective hearing experience. The medium- and high-frequency transmission of the PP basin is better, and the layering is strong, but it is limited in use as a bass in a home theater.
The dome-shaped diaphragm is generally used for a mid-high frequency speaker. The material has a hard ball top such as an aluminum alloy and a titanium alloy, and the soft ball top such as a silk film, a cloth film, and a nylon film. The hard dome has a wide frequency response, strong sound penetration and good layering. The top of the soft ball is flat and the tone is soft. Hard dome speakers are generally good at replaying signals from analog sources. Soft dome speakers are generally good at replaying signals from digital sources. This is just a relative concept and it is not possible to draw a conclusion: the hard dome speaker is a low-end configuration and the soft dome speaker is a high-end configuration. If this is true, JBL, which uses a lot of titanium film, can't only produce low-end goods? In fact, hard-ball-top speakers are most suitable for three-way speakers, and soft-ball top speakers are much easier to use. On the other hand, the price of soft dome speakers is relatively low, usually only 1/3 to 1/2 of hard dome speakers, so commercial speakers use soft dome speakers. However, in home theaters, because the sound dynamics are large, and the dynamics of the soft dome speakers are small, the sound is more prone to hair at high power, so pay special attention to this when purchasing.
Consumers have a general understanding of the sound of the speaker. When purchasing, you can decide which speaker to use according to your own preferences. If you feel that you don't have much control, it is best to make the speaker diaphragm materials of several speakers in the home theater consistent.
2. Note the difference between a double bass speaker and a passive radiation speaker:
The double subwoofer refers to a speaker using two woofers of the same diameter. The double woofer has high frequency radiant efficiency and good horizontal directivity, which is more suitable for home theater use. The passive radiant speaker is a woofer with a passive radiator. The two are similar in appearance. Under the same specifications, the cost, price and power consumption of the double woofer are greater than those of the passive radiant type. Speaker. The two methods of identification are as follows. When playing the sound, the two bass vibrating units are pressed separately, and the sounds of both are small and there is no significant difference, so it should be a double bass speaker. If a bass vibration unit is pressed, the sound becomes small, and the MF sound of the other bass vibration unit is not changed. Only the bass effect is weakened, and the latter is a passive body.
3. The selection skills of the center speaker:
The center speaker is more fixed. The center speaker usually uses two 4 inch or 5 inch units, or a ball top treble on this basis. Its main function is to make the dialogue clear and stabilize the sound image while the sound image is moving. Guarantee continuity and smoothness. Some center speakers are designed with a front side that is angled to the bottom. If the center speaker is placed at a high or low position, it is more appropriate to use such a center speaker, which is more convenient for the speaker's axial radiation to be aimed at the listener.
In Dolby Pro Logic normal mode, the center speaker requirements are lower, and most of the commercially available center speakers are of this type. In the Dolby Pro Logic Broadband mode and AC-3 system, the requirements for the center channel are higher, requiring flat response, low distortion and large dynamics. The center speaker is preferably the same speaker as the main channel, at least The indicator should also be close to the main channel.
Among the indicators of most commercially available mid-range speakers, the lower limit of the frequency response is about 80 to 100 Hz, the sensitivity is about 86 dB, and the power is 20 to 40 W. This type of center speaker is not suitable for broadband mode and AC-3 system. Many of the commercially available mid-range speakers use ordinary low-power speakers, which have large frequency unevenness and large distortion. In the broadband mode, people's dialogue changes, the distortion is large, there is a feeling of squeaky exhaustion, and the sound image is also erratic. If the picture object moves from left to right, the sound image movement makes people feel awkward and unnatural. In addition, in order to cause the sound and sound, some of the center speaker impedance is even lower than 4Ω, which is very easy to damage the amplifier. Therefore, you must be careful when choosing a center speaker.
In the actual audition, if the sound is very noisy, the fault is likely to be in the center speaker, the AV amplifier can be placed in the phantom mode, the effect is better, you can verify this conclusion. For impedance problems, see Tip 8.
4. Surround speaker selection skills:
The effect of the surround speakers is to increase the surround sound of the sound field, ensuring the continuity and smoothness of the transition when the sound image moves back and forth. Surround speakers are generally small in size, emphasizing a sense of sound field diffusion, requiring a speaker with a wide directivity, or a flat power response.
The problem of many surround speakers on the market is similar to that of the center speaker, so you should pay attention when purchasing.
THX surround speakers require a bipolar speaker. The speaker has two radiation directions. The angle between the directions is 90° to 180°. The radiation direction does not point to the listener, and the reflection from the wall is used to cause a good sound field.
Dolby Pro Logic's surround channels have a frequency range from 100Hz to 7kHz, while the AC-3 surround channel is full-band. Therefore, the purchase of surround speakers is best to use wide-band speakers for future upgrades.
5. Sensory selection skills:
When you buy a speaker, you need to be eye-catching, hand-to-hand, and ear--
Seeing: You need to see if there are any defects in the appearance of the speaker, whether the seam of the surface decorative skin is obvious at the corners, and whether there is blistering or unevenness at the surface. Pay attention to distinguishing the difference between the dural dome treble and the plastic diaphragm with the metal layer on the surface. The domestic plastic diaphragm has poor treble performance, strong sound burr, and is not resistant to hearing. This type of treble diaphragm is usually not convex. Out of the strong pattern.
Hand to: the weight of the speaker, usually the box is heavy, indicating that the speaker cabinet is thicker or the speaker uses a larger magnetic circuit. Some speakers have a large caliber and a small magnetic circuit. The speaker listened to the boring bass, the sound was too small, the treble was sharp and the volume was relatively light. In addition, some manufacturers add a thick (some thick 20mm) wooden frame behind or in front of the speaker, and a PVC decorative film on the outside, which gives people a very thick illusion (the actual thickness of the plate may be very thin). ), the weight of these speakers is generally light, as long as it is compared with the brand-name speakers of the same specifications. On the woofer, spread the five fingers evenly over the cone of the cone. Press a few times to see the softness. The softness indicates that the field sounder fO is low, and there may be a good low frequency response. Press the fold ring of the outermost ring of the speaker (mostly rubber edge) and quickly release it. The inferior ring has a “click†sound. The speaker ring is also made of polyurethane foam. The bass effect is softer than the rubber ring and the sensitivity is higher. The foam ring surface is rougher than the rubber ring and the service life is lower than the rubber ring. The woofer of the cloth immersed rubber ring has higher sensitivity, but the distortion is relatively large, and the domestic cloth immersed rubber folding ring speaker is particularly obvious.
The above-mentioned discriminating methods are merely simple discriminants and cannot be absolute. It is best to have it, and the actual comparison will be verified. It would be beneficial to use a brand name product as a reference.
6. Find the reference configuration:
As with AV amplifiers, choosing a representative product for reference is a very effective way.
7. Inspection of speaker magnetic shielding:
In the case of limited living conditions, the main and center speakers are very close to the TV. When the stray magnetic field on the surface of the tube exceeds 1 gauss, the color or pattern of the image is distorted, so the magnetic shielding is very important, and the magnetic field generated by the outer magnetic speaker is very strong, so the speaker must Magnetically shielded speakers are used. To achieve the same performance requirements, magnetic shielded speakers are more expensive than non-magnetically shielded speakers. Some manufacturers use external magnetic speakers or poorly magnetically shielded speakers to reduce costs, so magnetic shielding is required. During the inspection, the speaker and the TV can be placed close together, and the state of the TV is set to a blue screen without signal. After a period of time (some speakers can not see obvious influence in a short time, after about ten minutes, The effect will appear. So don't think that the speaker can be used to check the magnetic shielding effect of the speaker. The color (especially the four corners of the TV tube) does not change, then the magnetic shield meets the requirements, otherwise There may be no magnetic shielding or magnetic shielding that does not meet the requirements. The magnetic shielding of the center speaker is relatively high, and the requirements of the main speaker can be appropriately reduced. Therefore, the main speaker can also be placed in a place far from the TV allowed by the sound field.
8. Beware of counterfeiting when purchasing imported speakers:
There are many irregularities in the domestic speaker market, and some manufacturers use the superstitions of consumers on imported speakers to make their hands and feet. For example, domestic manufacturers register trademarks abroad, domestic production, and then enter the market after fake exports, or counterfeit famous brands, and produce and sell them in a sturdy manner. The speakers used in these speakers are mostly made up of domestic parts, the appearance is rough, and the medium and high frequency is obviously distorted. And the amount is too much. There is a identification method for consumers' reference. Usually, the outside of the woofer's folding ring, the imported standard type, the domestic non-standard or dimension is larger than the imported parts, such as 6.5-inch speaker imported parts will be marked with EC-141 and other words, domestic Most of the speakers are 158,160, etc. The imported parts of the 8-inch speaker will be marked with the words EC-178, and the domestic speakers are mostly 200. Therefore, the purchase of imported products should choose a higher-purity agent to buy, if found to be different, should be helpful to help people identify, beware of being deceived.
1. Pay attention to the difference between the speaker diaphragm material:
For home theater speakers, there are many forms, including main speakers, center and surround, etc. First, the sound of each channel speaker is required to be unified. The tone is a comprehensive reflection of the characteristics of the speaker, requiring the average consumer to effectively grasp the difficulty. Generally speaking, the material of the speaker diaphragm is different, and the effect on the tone is obvious.
The materials of the cone diaphragm mainly include ordinary paper cones, wool-filled pots, surface-sprayed resin paper pots, PP pots, carbon fiber woven pots and fiberglass pots. Ordinary paper cones are widely used and inexpensive, and their tone is basically neutral. The defect is that the middle and high sections of the frequency response are difficult to handle when frequency division, and the appearance is limited. The woolen paper cone is round and mellow, giving a warm feeling. The paper cone coated with resin material has a change in appearance, and the tone performance tends to be slender. The fiber woven basin has large internal damping, flat response, and easy to cross-connect, but the price is more expensive, and the bass processing is not good, there will be a hard and tight subjective hearing experience. The medium- and high-frequency transmission of the PP basin is better, and the layering is strong, but it is limited in use as a bass in a home theater.
The dome-shaped diaphragm is generally used for a mid-high frequency speaker. The material has a hard ball top such as an aluminum alloy and a titanium alloy, and the soft ball top such as a silk film, a cloth film, and a nylon film. The hard dome has a wide frequency response, strong sound penetration and good layering. The top of the soft ball is flat and the tone is soft. Hard dome speakers are generally good at replaying signals from analog sources. Soft dome speakers are generally good at replaying signals from digital sources. This is just a relative concept and it is not possible to draw a conclusion: the hard dome speaker is a low-end configuration and the soft dome speaker is a high-end configuration. If this is true, JBL, which uses a lot of titanium film, can't only produce low-end goods? In fact, hard-ball-top speakers are most suitable for three-way speakers, and soft-ball top speakers are much easier to use. On the other hand, the price of soft dome speakers is relatively low, usually only 1/3 to 1/2 of hard dome speakers, so commercial speakers use soft dome speakers. However, in home theaters, because the sound dynamics are large, and the dynamics of the soft dome speakers are small, the sound is more prone to hair at high power, so pay special attention to this when purchasing.
Consumers have a general understanding of the sound of the speaker. When purchasing, you can decide which speaker to use according to your own preferences. If you feel that you don't have much control, it is best to make the speaker diaphragm materials of several speakers in the home theater consistent.
2. Note the difference between a double bass speaker and a passive radiation speaker:
The double subwoofer refers to a speaker using two woofers of the same diameter. The double woofer has high frequency radiant efficiency and good horizontal directivity, which is more suitable for home theater use. The passive radiant speaker is a woofer with a passive radiator. The two are similar in appearance. Under the same specifications, the cost, price and power consumption of the double woofer are greater than those of the passive radiant type. Speaker. The two methods of identification are as follows. When playing the sound, the two bass vibrating units are pressed separately, and the sounds of both are small and there is no significant difference, so it should be a double bass speaker. If a bass vibration unit is pressed, the sound becomes small, and the MF sound of the other bass vibration unit is not changed. Only the bass effect is weakened, and the latter is a passive body.
3. The selection skills of the center speaker:
The center speaker is more fixed. The center speaker usually uses two 4 inch or 5 inch units, or a ball top treble on this basis. Its main function is to make the dialogue clear and stabilize the sound image while the sound image is moving. Guarantee continuity and smoothness. Some center speakers are designed with a front side that is angled to the bottom. If the center speaker is placed at a high or low position, it is more appropriate to use such a center speaker, which is more convenient for the speaker's axial radiation to be aimed at the listener.
In Dolby Pro Logic normal mode, the center speaker requirements are lower, and most of the commercially available center speakers are of this type. In the Dolby Pro Logic Broadband mode and AC-3 system, the requirements for the center channel are higher, requiring flat response, low distortion and large dynamics. The center speaker is preferably the same speaker as the main channel, at least The indicator should also be close to the main channel.
Among the indicators of most commercially available mid-range speakers, the lower limit of the frequency response is about 80 to 100 Hz, the sensitivity is about 86 dB, and the power is 20 to 40 W. This type of center speaker is not suitable for broadband mode and AC-3 system. Many of the commercially available mid-range speakers use ordinary low-power speakers, which have large frequency unevenness and large distortion. In the broadband mode, people's dialogue changes, the distortion is large, there is a feeling of squeaky exhaustion, and the sound image is also erratic. If the picture object moves from left to right, the sound image movement makes people feel awkward and unnatural. In addition, in order to cause the sound and sound, some of the center speaker impedance is even lower than 4Ω, which is very easy to damage the amplifier. Therefore, you must be careful when choosing a center speaker.
In the actual audition, if the sound is very noisy, the fault is likely to be in the center speaker, the AV amplifier can be placed in the phantom mode, the effect is better, you can verify this conclusion. For impedance problems, see Tip 8.
4. Surround speaker selection skills:
The effect of the surround speakers is to increase the surround sound of the sound field, ensuring the continuity and smoothness of the transition when the sound image moves back and forth. Surround speakers are generally small in size, emphasizing a sense of sound field diffusion, requiring a speaker with a wide directivity, or a flat power response.
The problem of many surround speakers on the market is similar to that of the center speaker, so you should pay attention when purchasing.
THX surround speakers require a bipolar speaker. The speaker has two radiation directions. The angle between the directions is 90° to 180°. The radiation direction does not point to the listener, and the reflection from the wall is used to cause a good sound field.
Dolby Pro Logic's surround channels have a frequency range from 100Hz to 7kHz, while the AC-3 surround channel is full-band. Therefore, the purchase of surround speakers is best to use wide-band speakers for future upgrades.
5. Sensory selection skills:
When you buy a speaker, you need to be eye-catching, hand-to-hand, and ear--
Seeing: You need to see if there are any defects in the appearance of the speaker, whether the seam of the surface decorative skin is obvious at the corners, and whether there is blistering or unevenness at the surface. Pay attention to distinguishing the difference between the dural dome treble and the plastic diaphragm with the metal layer on the surface. The domestic plastic diaphragm has poor treble performance, strong sound burr, and is not resistant to hearing. This type of treble diaphragm is usually not convex. Out of the strong pattern.
Hand to: the weight of the speaker, usually the box is heavy, indicating that the speaker cabinet is thicker or the speaker uses a larger magnetic circuit. Some speakers have a large caliber and a small magnetic circuit. The speaker listened to the boring bass, the sound was too small, the treble was sharp and the volume was relatively light. In addition, some manufacturers add a thick (some thick 20mm) wooden frame behind or in front of the speaker, and a PVC decorative film on the outside, which gives people a very thick illusion (the actual thickness of the plate may be very thin). ), the weight of these speakers is generally light, as long as it is compared with the brand-name speakers of the same specifications. On the woofer, spread the five fingers evenly over the cone of the cone. Press a few times to see the softness. The softness indicates that the field sounder fO is low, and there may be a good low frequency response. Press the fold ring of the outermost ring of the speaker (mostly rubber edge) and quickly release it. The inferior ring has a “click†sound. The speaker ring is also made of polyurethane foam. The bass effect is softer than the rubber ring and the sensitivity is higher. The foam ring surface is rougher than the rubber ring and the service life is lower than the rubber ring. The woofer of the cloth immersed rubber ring has higher sensitivity, but the distortion is relatively large, and the domestic cloth immersed rubber folding ring speaker is particularly obvious.
The above-mentioned discriminating methods are merely simple discriminants and cannot be absolute. It is best to have it, and the actual comparison will be verified. It would be beneficial to use a brand name product as a reference.
6. Find the reference configuration:
As with AV amplifiers, choosing a representative product for reference is a very effective way.
7. Inspection of speaker magnetic shielding:
In the case of limited living conditions, the main and center speakers are very close to the TV. When the stray magnetic field on the surface of the tube exceeds 1 gauss, the color or pattern of the image is distorted, so the magnetic shielding is very important, and the magnetic field generated by the outer magnetic speaker is very strong, so the speaker must Magnetically shielded speakers are used. To achieve the same performance requirements, magnetic shielded speakers are more expensive than non-magnetically shielded speakers. Some manufacturers use external magnetic speakers or poorly magnetically shielded speakers to reduce costs, so magnetic shielding is required. During the inspection, the speaker and the TV can be placed close together, and the state of the TV is set to a blue screen without signal. After a period of time (some speakers can not see obvious influence in a short time, after about ten minutes, The effect will appear. So don't think that the speaker can be used to check the magnetic shielding effect of the speaker. The color (especially the four corners of the TV tube) does not change, then the magnetic shield meets the requirements, otherwise There may be no magnetic shielding or magnetic shielding that does not meet the requirements. The magnetic shielding of the center speaker is relatively high, and the requirements of the main speaker can be appropriately reduced. Therefore, the main speaker can also be placed in a place far from the TV allowed by the sound field.
8. Beware of counterfeiting when purchasing imported speakers:
There are many irregularities in the domestic speaker market, and some manufacturers use the superstitions of consumers on imported speakers to make their hands and feet. For example, domestic manufacturers register trademarks abroad, domestic production, and then enter the market after fake exports, or counterfeit famous brands, and produce and sell them in a sturdy manner. The speakers used in these speakers are mostly made up of domestic parts, the appearance is rough, and the medium and high frequency is obviously distorted. And the amount is too much. There is a identification method for consumers' reference. Usually, the outside of the woofer's folding ring, the imported standard type, the domestic non-standard or dimension is larger than the imported parts, such as 6.5-inch speaker imported parts will be marked with EC-141 and other words, domestic Most of the speakers are 158,160, etc. The imported parts of the 8-inch speaker will be marked with the words EC-178, and the domestic speakers are mostly 200. Therefore, the purchase of imported products should choose a higher-purity agent to buy, if found to be different, should be helpful to help people identify, beware of being deceived.
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