Meet the subwoofers you are not familiar with
Subwoofer can make music and film performance even more shocking
But friends who play HiFi have a lot of different reactions to the subwoofer. Some people have a feeling that it is hard to control. Some people think that these are the enthusiasts who have experience with HiFi. Some people think this is used to solve small The equipment of the bookshelf's shortcomings does not need to be too careless when it is added to the whole system. Some people think that playing this kind of equipment is unpleasant and the success rate is too low. Some people think that an ideal system does not need to add Subwoofer; some people think that Subwoofer is only suitable for use in a large room... Although the views are different, the subwoofer is the least talked and least recognized by the enthusiasts. A very important piece of equipment. Through this article, I believe that some enthusiasts can change some opinions on the equipment of the subwoofer, and also hope to seek contend and jointly improve the level of fever.
Subwoofers are mainly divided into two categories, which are passive (PASSIVE) and active (ACTIVE). There are a lot of three-headed "3D" satellite systems (Subwoofer/SatelliteSystem) with subwoofer and two small main speakers on the market. In this system, only one subwoofer is used, so the subwoofer is mono. The (L+R) signal has a stereo effect above the split point. This system uses the volume control knob of the front stage to determine the volume of all the speakers. If the sensitivity or volume of the subwoofer is not equal to the main speaker, it will cause the sound field to be confused, the frequency response is not balanced, and the sound image can not be positioned. At this time, when the problem of the subwoofer cannot solve the problem, these problems are difficult to improve. This Subwoofer usually only appears in low-level low-cost systems.
There is also a passive subwoofer, the left and right main speakers are full range, and the subwoofer sounds when the bass below its upper frequency cutoff point appears. This kind of system is called a docking type subwoofer system. For example, the frequency of the main speaker replay is attenuated below 65 Hz, and the subwoofer's crossover point is around 65 Hz. Its purpose is to make the main speaker connect smoothly. The problem with this system is that although the main speaker is attenuated at 65 Hz, it is said that its low frequency starts to decrease below 65 Hz. The degree of reduction depends on the design requirements of each speaker, so Replaying with a subwoofer at 65 Hz will still conflict with the main speaker. The important reason is that the subwoofer speaker unit is different from the main speaker unit. When two different speaker units receive the signal, For example, the vibration quality of the subwoofer large-diameter unit is definitely greater than that of the main speaker, so the sounding speed is slower, and they must not sound at the same time. Welcome to the home theater network shopping guide network!
So there are a lot of enthusiasts who play this kind of super bass. After adding the subwoofer, the effect is more chaotic than not adding time. The designer of this subwoofer usually tries to minimize the sub-woofer's point of separation as much as possible, in order to avoid conflict with the main speaker. The subwoofer point of this system should only be designed for a certain pair of main speakers. When changing the left and right main speakers, the subwoofer's crossover point must be recalibrated. Although some main speakers are attenuated below 65Hz, there is still sound at 20Hz. When these speakers are connected with a subwoofer, the effect may be worse. The bass is not strong enough, there is no texture, and the bass may be felt. Very messy. Manufacturers of such subwoofers are usually designed with the main speakers together. Otherwise there will be problems with the attenuation at the crossover points and their frequency cutoffs (dB/octave), which are also low-cost system low-cost systems.
Active ACTIVE (double amplifier) ​​subwoofer system, the signal goes straight into the front stage with source frequency division, the frequency below 100Hz is amplified by the bass amplifier and sent to the subwoofer to broadcast. The frequency above 100 Hz is divided and sent to the rear stage of the main speaker, and amplified by the main speaker. At this point, there must be a volume control to control the ratio of the subwoofer volume to the volume of the main speaker. In addition, there is a phase adjustment knob that can adjust the phase of the bass amplifier from 0-180. school. Because the subwoofer amplifier and the main amplifier's power amplifier may be different designs, they will not be in the same phase in most cases. The listening effect of different phases will make the listener feel different. This phase knob is used. To make the subwoofer achieve the same phase as the main speaker. When the phase is adjusted to the same phase, the volume will feel louder and the bass will be more solid. The sound will be slightly slower when the phase is reversed to 180 degrees.
To properly use the subwoofer, the author believes that the subwoofer system must have the following five characteristics: 1. The subwoofer must have its own power amplifier; 2. Must have independent volume control; 3. Must have phase control; 4. The subwoofer must be placed in an independent position; 5. The main speaker must work above the crossover frequency of the subwoofer (eg 100Hz or above).
Most readers who play subwoofer think that because the bass of a small speaker is not enough, the subwoofer is used. As for the large speaker floor box, there is no need to use a subwoofer. In fact, playing the subwoofer is not as simple as assisting the bass. There are only a handful of traditional-type speakers on the market that faithfully reproduce the bass sound in the movie sound, and most of them are even high-priced AV surround amplifiers, and there is not enough power to drive the subwoofer. If an active active subwoofer is used, the above two problems can be solved. Welcome to the home theater network shopping guide network!
The so-called "active active" means that the subwoofer itself has a specially designed power amplifier, so the signal source it needs is only the general level signal from the AV surround amplifier. The active active subwoofer is easy to match with other audio equipment, no matter how it is designed with the sensitivity or low frequency response of the speaker, it can be adjusted to handle it. In addition, whether it is facing the sound field or facing the sound field, it is not necessary to move its position, just adjust the phase. The subwoofers discussed below are all active active subwoofer systems.
1. The main speaker does not need to work below 100Hz. Therefore, the distortion of this speaker above 100Hz will be reduced. Usually, the distortion of the speaker reproduction is due to the re-broadcast of the bass and the frequency distortion above 100Hz. If you do not need to push the signal below 100Hz, the ability of this unit to replay sound above 100Hz will be enhanced and the distortion will be lower.
2. Because the woofer has its own power amplifier, the power amplifiers of the left and right main speakers do not need to push the frequency below 100 Hz, only need to work above 100 Hz. Just because you don't need to push these basses, the power of this power above 100Hz will be two to four times larger than before. In this regard, it needs to be explained in this regard. If the power of the power amplifier is 50W, that is, when the amplifier works within the working range of 20-20000Hz, its driving power is 50W (the factory will never advertise that their power amplifier is in the When working at 70Hz or above, there is a saying of 200w, etc., and when we say the power output capability of a power amplifier, it is only said that when the amplifier is operating at 20 to 20000Hz, it can have a 50w output and so on. But when a 50W power amplifier only works above 100Hz, its power (above 100Hz) is the same sound level capability as a 100W to 200w amplifier replaying 20-20000Hz! But if this is originally It is 50W. Now, if the amplifier that is upgraded to 100-200W by replaying the frequency above 100Hz is working in the full frequency band, its power will be restored to its original shape and become the original 50W. When working above 100Hz, it will double or quadruple depending on the frequency of replay music. If it is mostly high-pitched, it will be four times; if it is mostly mid-bass, it will be twice. . The power amplifier is unchanged, except that when it is operating at different frequencies, its driving capability will be different because the energy of the entire frequency band is concentrated in the middle and low frequency bands. If a power amplifier only works below 10000 Hz, its "power" will not change much, but it will have an impact on its "power" when it is not necessary to push the bass;
3. Because the subwoofer can be separated from the main speaker, it can be placed elsewhere. The bass we hear in the room is mainly to hear the response of these basses in the room, so the placement of the bass speakers in the room has a great influence on the bass effect. Some speaker designers put the left and right main speakers on top of the subwoofer. This design does not consider the advantages of subwoofer and main speaker split. Some people may think that the experience is better, but if it is a conjoined, why do you need to play the subwoofer? In the speaker position, most of the positions suitable for the high-range speakers are not suitable for the subwoofer. Subwoofers should normally be placed behind the left and right main speakers. Because the subwoofer can be split, the sound field and positioning made by this playback system is not comparable to a pair of left and right main speakers (regardless of the level of your speakers). There are a lot of people who play big floor boxes and feel that the bass is not enough. I feel that there is no bass or the bass is too heavy and too turbid. The subwoofer system discussed in this article has independent bass adjustment, which can be used to adjust the volume ratio of the bass to the main speaker. In addition, it can have a separate position, so this subwoofer will never have a problem that the bass is too heavy or not enough.
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