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How to buy computer subwoofer speakers

2021-04-30 22
Abstract: I believe that people who love music are not unfamiliar with subwoofers. There are many types of subwoofers on the market. Faced with a wide variety of subwoofers on the market, how do we choose a subwoofer? What brand of subwoofer is good? Let's take a look at the several subwoofer options shared by the editor!

How to choose a computer subwoofer speaker Subwoofer speaker selection guide

Subwoofer: It is a common name or abbreviation for everyone. Strictly speaking, it should be: coaxial speaker, tweeter, super treble, super bass. In terms of audio analysis that can be heard by the human ear, it is composed of super bass, bass, low midrange, midrange, midrange, treble, and super high tone.

As the name suggests, the subwoofer is responsible for the bass. The subwoofer makes the song powerful. With it, it can make the reproduction of the program source stronger. Without it, it gives people the feeling of lack of power and energy. The tweeter reflects the details of the sound.

In principle, the working mode of the subwoofer and the speaker are exactly the same, but the diameter of the diaphragm is larger, usually 8 to 10 inches, and the speaker for resonance is added.

In terms of evaluation indicators, the subwoofer is basically the same as the loudspeaker. The specific content will not be introduced here, only the numerical requirements. The frequency response is generally below 200 Hz, the rated impedance is also about 4Ω, and the sensitivity is generally greater than 90 dB/ W/m.

At present, subwoofers can be roughly divided into active subwoofers and passive subwoofers. An active subwoofer refers to a subwoofer with a built-in power amplifier. When using it, there is no need to add an additional power amplifier, and it usually has a cylindrical shape. The disadvantage of this type of subwoofer is that the heat dissipation is not ideal and the power is not large, and the cylindrical shape usually produces unnecessary resonance, which reduces the controllability of the subwoofer. In contrast, a passive subwoofer requires an external power amplifier to work. The shape and power selection of this subwoofer can be more flexible, and the effect is naturally more ideal. In addition, active speakers can be further divided into sealed boxes and perforated boxes. The former is more suitable for deep symphony, and the latter is more suitable for pop music.

How to buy a computer subwoofer speaker How to buy a subwoofer speaker

The subwoofer is noisy

1. Generally speaking, there must be an amplifier inside an active speaker, so noise is inevitable, so saying "zero noise" is nonsense. According to the source, the noise of active speakers can be roughly divided into electromagnetic interference, ground interference, mechanical noise and thermal noise.


How to buy computer subwoofer speakers


2. Electromagnetic interference: Electromagnetic interference can be mainly divided into power transformer interference and stray electromagnetic wave interference. Generally speaking, multimedia speakers usually use EI-type, ring-type or R-type transformers.

3. Stray electromagnetic wave and ground wire interference: stray electromagnetic wave interference is more common, and speaker wires, frequency dividers, wireless devices or computer hosts will all become sources of interference.

4. Mechanical noise and thermal noise: This noise comes from mechanical movement, and this noise is also unique to active speakers.

5. Mechanical noise and thermal noise: This noise comes from mechanical movement, and this noise is also unique to active speakers.

The principle of subwoofer

The internal power amplifier circuit divides the sound into several frequency bands through the frequency divider. The medium and high frequency bands are output to the satellite speaker, and the low frequency band is output to the subwoofer. Generally, the subwoofer emits low frequency sound of 20-200HZ. When the energy is not very strong It is more difficult for people to hear, and it is difficult to distinguish the location of the sound source. Such low-frequency sound is transmitted through the inverted hole and resonates with the satellite speaker box. The low-frequency speaker and the weak bass generated by the satellite speaker box will combine with the satellite speaker box. Re-enactment speakers release the bass, so the bass effect is very shocking, and it makes people feel like it is emitted from the satellite speaker speaker. By now you should basically understand the principle of the speaker. As for why the ultra-low frequency speaker and the low-frequency resonance speaker, Then we need to understand with physical knowledge: satellites are weak bass, which can be heard by people. Their waveform amplitude is very small, that is, the energy is not large enough. When the ultra-low frequency generated by the speaker overlaps with it, it passes through the inverted hole, causing them If the phase is the same, then the ultra-low frequency is loaded on the satellite bass waveform. Because the speaker has a very strong power, the energy increases sharply after loading, which makes you feel very shocked.

Subwoofer type

At present, speakers can be roughly divided into coaxial speakers, tweeters, super treble, and super bass. A coaxial speaker refers to a speaker with a built-in power amplifier. When using it, there is no need to add another power amplifier. Usually the shape is a barrel type. The disadvantage of this kind of horn is that the heat dissipation is not ideal and the power is not very large, and the cylindrical shape usually produces unnecessary resonance phenomenon, which reduces the controllability of the horn. In contrast, an external power amplifier is required when the subwoofer is working. The shape and power selection of this speaker can be more flexible, and the effect is naturally more ideal.

The probability of using the subwoofer seems to be the lowest. It tends to appear next to young people who like metallic music. It is a must-have choice for car owners who like pop music and rock music. In principle, the working mode of the subwoofer and the speaker are exactly the same, but the diameter of the diaphragm is larger, usually 8 to 10 inches, and the speaker for resonance is added.

In terms of evaluation indicators, the subwoofer is basically the same as the loudspeaker. The specific content will not be introduced here, only the numerical requirements. The frequency response is generally below 200 Hz, the rated impedance is also about 4Ω, and the sensitivity is generally greater than 90 dB/ W/m.

Subwoofer in home theater system

It is indeed necessary to configure a subwoofer in a home theater system, but it does not matter if the conditions are not allowed. As a sound system, there is no standard for acceptance, but as a home theater, less than 5 speakers will have a very different effect. Far. For the general Hi-Fi system, it is recommended not to reluctantly configure the subwoofer, it is not fun.

The debugging of the subwoofer requires experience, if you are demanding. Generally, there are frequency connection problems, phase problems, and volume problems. Under normal circumstances, these are not uniform standards for each individual, you can feel comfortable. If the horn of the subwoofer is larger than 8 inches, generally lower the cut-off frequency of the subwoofer, such as 120Hz or below, if the diameter of the subwoofer is small, increase it, such as 160Hz and above.

The phase needs to be judged by listening. Generally, cheap subwoofers only have a positive and negative switch. Let others help to adjust this switch repeatedly. You are listening to the normal position. If the bass is aggravated and the sound is strong, then this position is It is fixed and only needs to be adjusted once. Of course, you must use the bass audition disc to cooperate at this time. The phase of some advanced subwoofers can be adjusted continuously (0-180).

The volume is not to allow the subwoofer to exceed the volume of the main speaker. After that, the sound will become blurred. The head is uncomfortable after listening for a long time. Of course, when the volume of the main speaker changes, the volume of the subwoofer must of course be adjusted. Therefore, it is necessary to equip the subwoofer with a remote control.

Precautions

The subwoofer is very common in daily life. It can be said that the subwoofer is also a daily essential item, but it is for some people. There are also some people who dislike the vibration of the subwoofer and think it is noise. In fact, listening to it occasionally can definitely make people excited and relieve stress. That's the case, but if the subwoofer "Biao Song" for a long time, it really is not a good thing.

According to experts: the so-called low-frequency noise refers to the sound with a frequency below 200 Hz (octave). There are five main types of low-frequency noise sources in residential quarters: elevators, transformers, water pumps in high-rise buildings, central air conditioning (including cooling towers), and traffic noise. Low-frequency noise has become the most influential noise source in residential areas, and it will have a long-term impact on human health in the long run. Because low-frequency noise can directly reach the ear bones of people, it will be affected by it for a long time, and it is easy to cause neurasthenia, insomnia, headaches and other neurosis.

I hope you can find the sound effects you like. The above introduces some problems that netizens need to pay attention to when buying a subwoofer. Hope that the above knowledge can help you to buy satisfactory products.
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