低音炮（Subwoofer）

低音炮（Subwoofer） 低音炮(Subwoofer) Subwoofer medical aircraft The subwoofer is everyone's a known or, strictly speaking should be: coaxial horn, treble Aberdeen, treble, bass. Audio analysis of the human ear can hear, composed of the bass, bass, tenor, Alto, low treble, treble, treble etc.. Catalog brief introduction principle Effect type principle Texture of material structure Function extension Sound tone timbre dynamic Total harmonic distortion brief introduction principle Effect type principle Texture of material structure Function extension Sound tone timbre dynamic Total harmonic distortion The editor of this paragraph. Simply speaking, the low frequency horn is a basic framework of sound, if the horn is the voice of the flesh, high frequency horn is the voice of the details reflect. Subwoofer With the development of science and technology development and the economic basis, subwoofer and broadband horn into the sound world. The subwoofer is to strengthen the architecture, broadband horn is to sound more clear differences. The subwoofer ear can smell is extremely limited, but other senses people will feel this is the feeling of shock! Need audio program source audio and home theater reflects the bass, just exist and in particular source programs needs to be restored, it can make the reduction program is more strong, without it, will give people a feeling of energy, lack of power. For example, in the cinema or in reality, we can feel the shock of that power and energy when the plane took off, but if we have no home theater configuration subwoofer speakers or configuration is not reasonable, we cannot feel the shock, but nothing. Edit this paragraph principle Subwoofer In principle, the horn and speaker mode is exactly the same, only the diaphragm has a larger diameter, usually 8 to 10 inches, and increased for the resonance box. The frequency response was below 200 Hz, the rated impedance is 4 ohm, the sensitivity is generally greater than 90 dB/W/m. Two satellite speakers function generates frequency range can be heard the voice, because of their small size, small power unit, their bass effect is very weak, but they have excellent performance in high. Edit this paragraph. Horn function: internal amplifier circuit, the frequency divider will sound into several frequency, output to the satellite speakers in high frequency, low frequency output to the subwoofer, a general subwoofer sound 20-200HZ in low frequency, energy is not very strong when people is difficult to hear, and it is difficult to distinguish the sound source azimuth, low-frequency sounds such through the phase reversal hole spread, resonance and satellite loudspeaker, low frequency and weak bass horn loudspeaker produced with satellite, satellite loudspeaker will re release horn performing bass, so low sound fruit very shocked, is sent from the satellite loudspeaker there as people feel and here, you should understand the basic principle of the horn of it, as to why the ultra low frequency and low frequency resonance horn horn, that you must understand in Physics: Micro Satellite Weak bass, can be heard, their amplitudes are very small, the energy is not big enough, when the ultra low frequency overlapped with the horn produced, because after the phase reversal hole, causing them to phase, then the ultra low frequency load to the satellite bass waveform, because the horn has power strong, sharp energy increase the load, so that you feel very shocked. Edit this section type The horn can be divided into coaxial horn, high earners, treble, bass categories. Coaxial horn refers to the built-in loudspeaker amplifier itself, do not use plus power amplifier, usually cylindrical shape. This deficiency is not ideal, horn radiation power will not be great, and the other cylinder will usually produce resonance phenomenon is unnecessary, the controllability of the horn decreased. In contrast, subwoofer work requires external amplifier. This horn shape and power selection can be more flexible, natural effect is more ideal. Using the probability of subwoofer seems to be the lowest, often appear in the flavor of love metal music young people around, love is the essential choice of popular music and rock music owners. In principle, subwoofer and speaker mode is exactly the same, only the diaphragm has a larger diameter, usually 8 to 10 inches, and increased for the resonance box. The evaluation index, subwoofer speaker with basically the same, the specific contents here do not specifically introduced, only about the numerical aspects of the requirements, frequency response are generally below 200 Hz, the rated impedance is 4 ohm, the sensitivity is generally greater than 90 dB/W/m. Edit this paragraph principle The internal power amplifier circuit, the frequency divider will sound into several frequency, output to the satellite speakers in high frequency, low frequency output to the subwoofer, a general subwoofer sound 20-200HZ in low frequency, energy is not very strong when people is difficult to hear, and it is difficult to distinguish the source range, low frequency this sound through the phase reversal hole spread, resonance and satellite loudspeaker, low frequency and weak bass horn loudspeaker produced with satellite, satellite loudspeaker will re release horn performing bass, and bass effect is very shocking, but also make people feel is sent from the satellite loudspeaker there, here you are the basic principle of the horn should know it, as to why the ultra low frequency and low frequency resonance horn horn, that you must understand in Physics: the satellite is weak bass, can Is heard and their amplitudes are very small, the energy is not big enough, when the ultra low frequency overlapped with the horn produced, because after the phase reversal hole, causing them to phase, then the ultra low frequency load to the satellite bass waveform, because the horn has very strong power, energy increases rapidly after loading that makes you feel very shocked. Edit this section material Because of the low-grade plastic speaker box is thin, can not overcome the resonance, no sound at all (benbenxiong note: not necessarily, plastic speaker design of wooden sound box is far better than the poor); the sound box reduces the resonance caused by the sound box with sound quality is generally better than the plastic sound box. Usually multimedia speakers are double frequency loudspeaker output unit two design, a smaller charge in the treble, and a larger one for bass speaker output. Select the speaker should consider these two materials: horn tweeter multimedia active speaker at a soft dome (mainly in addition for titanium dome analog audio signal, etc.) and digital audio matching can reduce high frequency signal stiff feeling, giving a gentle, smooth and delicate feeling. The majority of multimedia speakers with silk film and cost better quality low PV film soft dome. It determines the characteristics of the woofer speaker sound, choose some relatively important, the most common are the following: the paper basin, and apply the adhesive tape paper base basin, basin, basin and other tight pressed wool several cone timbre nature, cheap, good rigidity and lighter material with high sensitivity, disadvantage is moistureproof poor, when manufacturing consistency is difficult to control, but the top HiFi system of paper basin manufacturing because the sound output is meet the eye everywhere, on average, to restore the good; bulletproof cloth has a wide frequency response and low distortion, strong bass is very fond of the preferred, disadvantage is high cost, complicated manufacturing process, sensitivity high light music effect is not very good; wool knitting basin, texture is soft, it shows on the soft music and light music is excellent, but the bass effect is poor, lack of strength and shock strength; PP (polypropylene) basin And it is widely popular in high-end speaker, good consistency and low distortion, the performance is remarkable. In addition, like fiber membrane and composite membrane etc. due to the high prices rarely used in popular speakers, can not talk about. The speaker size is better, large caliber woofer can have better performance in the low frequency part, it is can be picked up in the purchase. Made of high performance speaker speaker means transient lower distortion and better sound quality. Ordinary multimedia speakers, subwoofer speakers of more than 3 to 5 inches. Made of high performance speaker speakers also means that the transient lower distortion and better sound quality. Edit this paragraph structure Speakers from the form of structure, can be divided into the bookshelf and floor type, the former is small, clear and accurate positioning, but the power is limited, the amount of low frequency extension and lack of sense, for music lovers to enjoy high fidelity music based, we also have a fever friendly multimedia choice; the latter is larger, bear power large amount of low frequency and strong elasticity, good performance and strong momentum of torrential shocking, but did not do a good sense of hierarchy and the location will be a slight lack of. For different music enthusiasts, this should also be aware of the importance of content in the purchase before. The PC family seldom have placed large landing box, so the desktop bookshelf speaker cabinet should be the first choice of multimedia active speaker. In general, as long as the power amplifier module design is reasonable, the greater horn is more sound, listen. Edit this paragraph function extend Refers to the speaker is supporting a multichannel input at the same time, whether the output interface is connected with passive surround speakers, whether there is a USB input function. Can the number of external subwoofer surround speakers is one measure of expansion performance. Analog interface and USB interface two main common multimedia speaker interface, such as optical fiber interface and innovative special digital interface is not very much, so do not introduce more. Sound The hardware of 3D audio technology is now more common to have several SRS, APX, Spatializer, 3D Q-SOUND, Virtaul Dolby and Ymersion, although their different methods of their implementation, but they can make people feel the effect of three-dimensional sound obvious, of which the former three are more common. The application is extended stereo (Extended Stereo) theory, which is through the additional circuit of the voice signal processing, make the listener feel imaging range is extended to the outside of the two speakers, which were extended, so that people have a sense of space and three-dimensional sense, have a more broad stereo effect. In addition there are two audio enhancement technology: active servo technology (essentially using Helmholtz resonance principle), BBE high definition technology plateau sound playback system and phase fax technology, also have certain effect on improving the quality of. For multimedia speakers, SRS and BBE two kinds of technology is relatively easy to achieve a good effect, can effectively improve the speaker performance ability. tone Which has a specific and stable signal is usually high, generally speaking is the degree of sound tone. It mainly depends on the frequency, but also related to the intensity of the sound. The high frequency of sound the human ear response is high and low frequency tones of voice ear response is low tone. Pitch with frequency (Hz) changes basically a logarithmic relation. Different musical notes of the same frequency tone, although different, but their tone is the same, that is the fundamental performance sound is the same. timbre The sound quality feeling, characteristic quality is also a sound different from another sound. Different instruments in the same tone, they can meet different natural color. This is because they have the same frequency, but the harmonic components are very large. It not only depends on the fundamental tone, and is closely related to the fundamental frequency and harmonic multiples, which makes each kind of musical instrument and everyone has a different tone. dynamic The strongest and weakest voice ratio, denoted by Db. For example, the dynamic range of a band is 90dB, which means that the weakest part of power than the loudest part of the low 90dB. Dynamic range is the power ratio, regardless of the absolute level of sound. As mentioned earlier, the dynamic range of the human ear from 0 to 130dB. Change the dynamic range of the sounds of nature is great. General language signal is only about 20 ~ 45dB, Some Symphony dynamic range is up to 30 ~ 130dB or higher. But due to some factors, the dynamic range of audio systems rarely reach the dynamic range of the band. The internal noise recording device determines the tone may be recorded, and the maximum capacity of the system (signal distortion level) limits the strongest voice. The dynamic range of the sound signal is 100dB, the dynamic range of the audio equipment can do 100dB, it is very good. Total harmonic distortion An audio signal source through a power amplifier, due to the additional harmonic components of the output signal caused by the nonlinear element over the input signal. Harmonic distortion is caused because the system is not completely linear, we used the percentage of RMS increased total harmonic component and the original signal effective value to represent. For example, an amplifier in the output of 10V and 1000Hz plus Lv 2000Hz, the two harmonic distortion when there is 10%. All the additional harmonic level and is called the total harmonic distortion. Generally speaking, the total harmonic distortion at the frequency of 1000Hz minimum, so many products are the distortion frequency as its index. But the total harmonic distortion and frequency, so the Federal Trade Commission in 1974, the total harmonic distortion must be in 20 ~ 20000Hz full range of audio frequencies measured, and the maximum power amplifier must be in the load for the total harmonic distortion is less than 1%, 8 ohms speaker under the condition of measurement. Minimum total harmonic distortion of the provisions of the International Electrotechnical Commission for pre amplifier 0.5%, with amplifier is less than or equal to 0.7%, but actually can do the following: 0.1% FM stereo tuner is less than or equal to 1.5%, actually can do more to do less than 0.5%; the CD player to below 0.01%. Atlas atlas more. Open classification: The speaker, the speaker. The speaker and electronic products. Audio equipment. I improve the subwoofer: Car audio equalizer home theater speaker microphone headset audio multimedia speaker amplifier Car audio equalizer home theater speaker microphone headset audio multimedia speaker amplifier Baidu's Wikipedia entry for reference only, if you need to solve specific problems (especially in law, medicine and other fields), you are advised to consult professionals in related fields