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What is a subwoofer?
Subwoofers, also known as subwoofers, are a class of speakers that are used to enhance the bass output of wideband speakers and to try to make the bass deeper. Having it can make the reduction of the program source more robust. Without it, it gives people a feeling of lack of power and energy. The high-frequency sound can reflect the details of the sound. 
Second, the principle of the subwoofer
The internal power amplifier circuit divides the sound into several frequency bands by means of a frequency divider, and outputs the mid-high frequency band to the satellite speaker and the low band to the bass.
Generally, the subwoofer emits a low-frequency sound of 20-200 Hz. When the energy is not very strong, it is difficult for people to hear it, and it is difficult to distinguish the source position. Such low-frequency sound is transmitted through the inverting hole to generate resonance with the satellite speaker. Combined with the weak bass produced by the horn and the satellite speaker, the satellite speaker will release the bass by re-interpreting the actor's horn, so the bass effect is very shocking, and the sensation is that it is sent from the satellite speaker.
Third, the role of the subwoofer
Adding a subwoofer (especially an active one) to the original audio system will increase the dynamic range of the system and make the low frequency dive deeper. At the same time, it will make the transparency of the intermediate frequency better, and the sound will be more unrestricted and more glorious.
With the addition of boosted power and subwoofers, the sound system can play back music peaks at higher levels. And because the main speaker is no longer tasked with replaying bass, it can be louder with louder sounds. And because the cones of the woofer of the main speakers no longer need to be moved back and forth as intensely as before, the midrange will be clearer when used to replay music.
however. There are also advantages and disadvantages. The subwoofer also has its disadvantages. From the perspective of listening to music, adding a subwoofer can often degrade the performance of the sound system when playing back music. The reason is that most of the subwoofers are not well-designed; they are not properly adjusted; or they are simply designed to be quite effective when used in home theater systems. In short, I don't want people to hear the subtleties of music. 
Fourth, subwoofer classification
Subwoofers can be divided into passive subwoofers and active subwoofers.
1, passive subwoofer
The passive subwoofer only has one or more subwoofers in the speaker, which is no different from ordinary speakers. Only need to use the external power amplifier to promote. But there are also subwoofers that can share a power amplifier with other speakers.
In such a forced home mode, the wideband output of the power amplifier is also added to the subwoofer, and the frequency division network in the subwoofer is needed to divide the low frequency signal from the audio signal and add all the remaining filters. To the main speaker, this method requires adding a crossover network that filters the speaker level signal in the signal path.
Active active subwoofer
Active subwoofers combine a subwoofer with a line-level crossover network and a power amplifier in the same cabinet, eliminating the need for additional cabinets and additional power amplifiers. This speaker has a line level input for the input signal of the preamplifier, which is used to push the line level output of the power amplifier and the volume control of the speaker.
Five, subwoofer evaluation indicators
1, power:
It determines the maximum sound intensity the subwoofer can emit. We need to look at the rated power, you can also ask the power amplifier module model, and then check the module's output power, which is the speaker's output power. There are currently two types of power labeling for subwoofer speakers: rated power and peak power. SNR: The higher the better. 
2, box material
The current subwoofer speaker material is divided into two kinds of plastic and wood. Speakers originally considered wood materials are better than plastic speakers, but at present this idea is not perfect. Some well-made plastic speakers outperform the shoddy wooden speakers. Therefore, when selecting a speaker, the 掂 component is a very important step. If a large wooden speaker is very light, then its performance will not be so good.
3, diaphragm material
The diaphragm material refers to the manufacturing material of the speaker diaphragm. Among them, the diaphragm of the tweeter is made of plastic film, silk film, and metal film; the diaphragm of the bass unit is made of paper cones, polyethylene basins, wool pots, aluminum-magnesium alloy pots, bullet-proof cloth pots. These materials have different properties and prices are high or low. It is difficult to say who is superior or not, like string music, choose paper cones, wool pots, metal music selection, polyethylene basins, ballistic cloth pots, the use of paper cones in the south, wool pots try to Less choice, easy to absorb moisture, change the sound quality.
4, speaker unit diameter
The speaker unit diameter (bass) is generally between 2 and 6 inches. Within this range, the larger the aperture, the higher the sensitivity and the better the low-frequency response.
Six, subwoofer purchase considerations
1, subwoofer volume is not the bigger the better
Introductory users buy subwoofers, many believe that the bigger the better, it is not. The larger the unit's subwoofer, although it can theoretically lead to lower dive and volume, it is theoretical. A 15-inch 2000 yuan subwoofer, regardless of data or hearing is difficult to beat a 12-inch 8,000 subwoofer. So, the more you get into the subwoofer, we recommend that you choose a small gun but it will be better. Because of the same price, small-sized product materials are more compact than large ones, and smaller unit sounds are easier to control. Cheap large-size subwoofers advise you not to buy!
This is big and cheap. It's a waste for home theater!
2, the greater the power, the better
The greater the power, the better the ability to push and the ability to control the unit. When selecting a subwoofer, pay attention to its standard RMS power, which means that the subwoofer amp can output stable power for a long time. And many RMS 300W subwoofers, dynamic power standards are often 600W or 700W. Dynamic power, refers to the subwoofer power output can be achieved in a short time, this indicator to look like, do not be too persistent.
In addition, JL, the big-name subwoofer maker, is not honest in labeling. For example, the popular product JL F113, enthusiasts basically believe that this product is a 2500W RMS rated power product, but in fact we found a word game on the official page - 2500W RMS short-term, which shows that the RMS rated power is short In time, I can only understand that this is a sign of premature ejaculation, it is ridiculous.
3, low frequency response is not as low as possible
The wider and lower audio frequency indicator is the focus of many small white users to pick the subwoofer. Now there are subwoofers all over the world claiming they can achieve 15Hz and 10Hz dive. In fact, this is meaningless. Among the Blu-ray discs we watch, the recorded subwoofer channel signals are mostly 20Hz to 120Hz (Dolby tracks) and 20Hz to 80Hz (DTS tracks). We don't know where the signals coming back below 20Hz come from.
4, the subwoofer is inevitably heavy
Of course, the premise is that the inside is not a brick. The weight of the subwoofer consists of a unit, a gun, and a box. The heavier the unit, the more firm the pots are and the larger the magnets are.
Seven, subwoofer what brand is good
1, thunder
Thunder subwoofer has been listed in the United States for nearly 10 years. It dominates the world with its unique direct-coupled servo technology. Once launched, it is popular with many fans. So far, it has been widely acclaimed in the United States, especially low-frequency sound quality (clear, form-sensitive bass) has an extremely important position in the subwoofer market.
2, Maibo
Microlab is mainly engaged in the research, design, production, sales, and service of multimedia speakers, digital speakers, home speakers, and HiFi audio. Product sales and brand awareness are among the best in the industry.
3, Hivi hivi
As a Hi-End premium audio manufacturer, HiVi HiVi has received such acclaim in the world: HiVi hivi combines the industry's advanced electro-acoustic technology with China's precision industrial manufacturing, so HiVi hivi products have the quality and cost-effectiveness of the industry leader.
4, Ho
He's Audio Technology Co., Ltd. is located next to Liang Qichao's famous tourist attraction in Xinhui District, Jiangmen City. It is a "music farm" type manufacturer specializing in the research, development, design, and production of hi-fi and professional speaker systems.
5, Yamaha
Yamaha Corporation was established in 1887 and has a long history of companies. Yamaha has a solid position in the world market through its worldwide sales companies. The main production of musical instruments, professional audio equipment, audio-visual products and semiconductor materials.
6, Lok Fu Hao
Lok Fu is a well-known British audio brand with a history of more than 70 years. Lever Rich Audio was founded in 1932 and has been dedicated to the design, development and manufacture of audio products.
7, JBL
Founded in 1946 in the United States, Harman International Group brand, the world's prestigious top audio brands, the earlier application of professional technology in the field of cinema and studio audio systems applied to home audio, the world's larger professional speaker manufacturers
8, SVS
The world-famous US speaker SVS was founded in 1998 in Youngstown, Ohio, USA by a group of professional enthusiasts who are extremely passionate about music. The founders have integrated unique design concepts and advanced production experience. They have constantly surpassed themselves and pursued excellence for more than a decade. They have met the hunger of demanding high-end users who are pursuing sound quality.
9, Zunbao
The world's top ten audio brands, the famous subwoofer brand, was founded in 1966 in Denmark, Europe's largest manufacturer of speakers, the world's best-selling audio brands that are widely welcomed around the world.
10, Sony
Sony is the world's largest player in the field of electronic 3C, gaming, finance, and entertainment. It has world-renowned brand influence and is the world's leading personal broadband entertainment company.
Eight, subwoofer what price is good
1, subwoofer below 2000 yuan
Tianyi: SUB-10TD
Octopus: PM-100MK
AAD: SD10
Ho's: TA100
Lok Fu PC10+, Lok Fu SW150
Yamaha: YST-SW215
2, 2000 to 4000 yuan subwoofer
Yamaha: YST-SW315, WST-SW515, NS-SW700
Tianyi: SUB-12TD
Swans: SUB10, SUB10D, SUB10V, H10SUB
AAD: S160
JBL: ES150P, ES250P, STUDIO150P
KEF: C4, PSW2500, Q400B, KUBE2
CJ: SW-450, SW-110
Reebok: TURBO10, TURBO1000
Lok Fu: SPC-10, Diamond 10MX-SUB, SW250
Velideng: IMPACT10, IMPACT12
Crystal Acoustics: THX-8SUB-BL
3, 4000 to 8000 yuan subwoofer
Jumbo: SUB650
Lok Fu: SW300, SPC-12, PC15+
Swans: SUB15D
KEF: XQ60B
CJ: SW-310, SW-112, SW-115
Sun: HRS-10, HRS-12, SDS-10, SDS-12
Powered by: CHT-8Q, CHT-10Q, CHT-12Q
XTZ: 99W10.16S, 99W12.16S, 99W12.18P
BL: L8400P, LS120P, STUDIO550
MK : SB8, SB12, SB-12SF
Earthquakes: FF10, FF12
Crystal Acoustics: THX-10SUBT-BL
Reebok: TURBO1200PRO
Thunder: FV12, FV12S, LV12S
SVS: SB-1000, PB-100
4,8000 to 150,000 subwoofers
Lok Fu: SW-380
KEF: R400B
Jazz: KW120-THX
Reebok: ULTRA13
Powered by: SPL-1000R, SPL-1200R, CHT-15Q
SVS : PC12-NSD, PB12-NSD, SB12-NSD
MK : SB-1250THX, MX250, VX-1250
Thunder: F12, F15, E15HP, FV15
REVBL: B120
Earthquake: MINIMEP10, MINIME P12
XTZ: 99W12.18ICE
Crystal Acoustics: TX-12SUB-BLA
5, more than 15,000 subwoofer
Velideng: SPL-1500R, DD-10, DD-12, DD-15, DD18
SVS: SB13-PLUS, PC13-ULTRA, PB12-PLUS, PB13-JLTRA, SB13-ULTRA, PB13-ULTRA
Thunder: FV15HP, F22HP
CJ: RT-12D
Sun: EQ10, EQ12
MK :MX-350SF
Jieli: F110, F112, F113
Earthquake: MK VII-12PIANO, MK VII-15PIANO
REVBL: B15, B110, B112
JBL :ARRAY1500
to sum up:
How, after reading, did you learn more about subwoofers? Do you know how to buy a subwoofer?
Totally expanded the sleeving can reach at least one point five times than the initial dimension.
What does the subwoofer mean? How to buy an entry-level subwoofer? This is undoubtedly very difficult for many users who have just contacted the sound system. But when you get here, you don't have to worry about it. Below I will systematically introduce you to the subwoofer related knowledge, and how to buy a good subwoofer. Interested friends do not go away.