What is party speaker?
party speakers is a device that converts an audio signal into sound. Generally speaking, it refers to the power amplifier in the Party Portable Speakers host box or subwoofer box. After amplifying and processing the audio signal, the sound is played back by the speaker itself to make its sound louder.
Active Powered Speaker is the terminal of the whole sound system. Its function is to convert audio electric energy into corresponding sound energy and radiate it to space. It is an extremely important part of the sound system. It undertakes the task of transforming electrical signals into acoustic signals for people's ears to listen directly.
Performance index editing and broadcasting
1) Frequency response (effective frequency range)
2) Rated impedance
3) Power
4) Sensitivity
5) Directivity
6) Distortion
Harmonic distortion refers to the addition of high-order harmonic components not found in the original signal in reproduction.
Intermodulation distortion, we know that the powerful bluetooth party speakers is a nonlinear device. In the process of reproducing the sound source, due to the non-uniformity of the magnetic field of the magnetic gap and the nonlinear deformation factors of the support system, a new frequency component that is not in the original signal will be generated. Therefore, when the new frequency signal and the original frequency signal are added to the loudspeaker, another new frequency will be modulated. In addition, the music signal is not a single audio sine wave signal, but a multi audio signal. When two signals with different frequencies are input into the speaker at the same time, due to the large existence of nonlinear factors, the two signals will be modulated to produce a new frequency signal. Therefore, in the playback frequency of the speaker, in addition to the original signal, there are new frequencies that are not in the two original signals. This distortion is intermodulation distortion. Its main influence is pitch (also known as pitch).
Transient distortion, the transient distortion of speaker system, refers to a kind of transmission waveform distortion caused by the mass inertia of speaker vibration system. Because the loudspeaker has a certain mass inertia, the paper basin vibration can not keep up with the instantaneous changing electrical signal, resulting in the distortion of transmission waveform, resulting in the change of spectrum and timbre. The quality of this index is very important in speaker system and speaker unit, which directly affects the restoration degree of sound quality and sound color.
7. Standard power (unit: W): the power marked on the bluetooth-enabled party speakers . Two marking methods are popular in the world:
Long term power or rated power, the former refers to the maximum input electric power of inputting a specified analog signal to the speaker within the rated frequency range, the signal duration is 1 minute, the interval is 2 minutes, repeated 10 times, and the speaker does not produce thermal damage and mechanical damage. The latter refers to inputting sine wave signal to the loudspeaker within the rated frequency range, the signal duration is 1 hour, and the loudspeaker does not produce the maximum sinusoidal power of thermal damage and mechanical damage.
The maximum withstand power, namely music power (MPO), originated from the German industrial standard (DIN) refers to the maximum power that the loudspeaker can withstand in a short time. This is because the amplitude of the audio signal changes greatly when playing the music signal. Sometimes the peak value of the music power will exceed several times the rated power in a short time. The power labeling standards formulated in China's national standard gb9396-88 include maximum noise power, long-term maximum power, short-term maximum power and rated sinusoidal power Wave power. Usually, the speaker manufacturer takes the long-term power or rated power as the marked power of the speaker.
8. Nominal impedance (unit: Ohm Ω): refers to the ratio of the signal voltage U input by the loudspeaker to the signal current (the same as in high school physics, r = u / I). Since the impedance of the loudspeaker is a function of frequency, the impedance value also changes with the frequency of the input signal. The preferred values of speaker impedance specified in China's national standards are 4 Ω, 8 Ω and 16 Ω (the recommended value in the international standard is 8 Ω), and it is specified that the nominal impedance of the loudspeaker is the lowest impedance value between the peak F0 of the loudspeaker resonance frequency and the second resonance peak F1. Some foreign loudspeaker manufacturers use the section where the impedance characteristic curve tends to be flat as the nominal impedance of the loudspeaker. The nominal impedance of the loudspeaker is different from the nominal impedance of the loudspeaker because there is no noise in the loudspeaker There is only one speaker unit, and the properties of each unit are different. In addition, there is a frequency division network in series or parallel. Therefore, the standard stipulates that the minimum impedance shall not be less than 80% of the nominal impedance value.
9. Sensitivity (unit: dB): the sensitivity of the speaker refers to the sound pressure level measured at a distance of 1m from the geometric center of each speaker unit on the front of the speaker when the input electric power to the speaker in the speaker system is 1W (the sound pressure is directly proportional to the amplitude and frequency of the sound wave, and the sound pressure level is an indicator of the relative size of the sound pressure). It should be specially pointed out here that although the sensitivity is an indicator of the speaker, it has nothing to do with the sound quality and timbre. It only affects the loudness of the speaker. The loudness of the speaker can be improved by increasing the input power.
10. Efficiency (expressed in percentage): the definition of speaker efficiency is the ratio of the sound power output by the speaker to the electric power input (that is, the percentage of sound to electricity conversion). Recently, speakers sold on the market are usually marked with sensitivity, while some speakers are marked with efficiency, which is expressed in decibels. This wrong marking method has confused some consumers with the two indicators of sensitivity and efficiency. The two indicators of sensitivity and efficiency of speakers have nothing to do with sound quality and timbre, let alone assessment quality But the sensitivity and efficiency are too low. The input power of the power amplifier must be increased to reach the required sound pressure level.
Fbelec speakers have the characteristics of good sound quality, long service life and favorable price. They are exported to Russia, Germany, the United States, the United Kingdom and so on
Identification of subwoofer
The quality of subwoofer directly determines the frequency response range and bass effect of subwoofer. In terms of the design of loudspeaker paper basin, there are mainly "dialysis paper basin", "adhesive paper basin", "bulletproof material woven basin", "wool woven basin" and "CD film" in the current market. The advantage of "dialysis paper basin" is low cost, but the disadvantage is that the low frequency is strong when the power is too large, and the durability is poor; "Gummed paper basin" also has the advantage of low price and slightly better durability. It is also not suitable for high-power use; These two types of products can be positioned in general enthusiasts, but they are definitely not professional enough. "Bulletproof cloth fiber woven basin" has the advantages of strong bass and outstanding performance in rock music and percussion. It is suitable to be used as the main speaker in high-power amplifier. The disadvantage is that the manufacturing process is complex and the price is naturally not cheap; The advantage of "wool weaving basin" is that it has ideal effect on soft music such as light music, and is suitable to be used in the range of medium and low bass. The disadvantage is that the performance of low bass is not strong enough, and the sense of strength is also inferior; "CD film" is a new product in the market. As an excellent bass speaker material, its performance in all aspects is obvious to all. However, it has not been accepted by many manufacturers, so there are few speakers made of this speaker.
Influence of materials on quality
The materials used for speakers are mainly divided into plastic boxes and wooden boxes. The thickness and quality of materials are directly related to the cost of speakers, and also affect the performance of speakers. The greater the material density of the speaker shell, the smaller the vibration generated by the box when making sound, especially for the active speaker with high-power amplifier. To a certain extent, the plate thickness is a powerful guarantee for realizing the subwoofer effect. Therefore, the subwoofer effect of the plastic speaker can not be praised. Obviously, low-end audio products must be molded. But must the mid-range speakers be made of wood? The answer is No. This grade of speakers are both wooden and plastic shell imitation wooden, but some imitations have completely reached the level of confusing the fake with the real. Medium and high-grade products must be made of wood, but medium density board or multi-layer board is used, which also has different effects on sound quality. Even if the selected plates are the same, the output power is the same, and the sound quality may still be far different with different design structures and different box sizes. However, although some speakers use plastic boxes, they are also outstanding. For example, FBelec's sound speaker speakers not only use plastic shells, but also have a small volume. There is nothing special at first glance. However, after listening and comparing, they feel that they are really extraordinary. Both the timbre and sound quality have reached the professional level, and the bass also has a strong shock, Of course, the price is not cheap.
NINGBO FBELE ELECTRONICS CO.,LTD.
FBELE company was founded in 1997, is China's leading manufacturer of acoustic and other electronic components, we designs,manufactures, distributes high quality products in very competitive price, bestservice, timely delivery, small order acceptable, etc. Our products include piezo ceramic element, piezoelectric buzzer, magnetic buzzer,speakers, transducer, receiver, electret condenser microphone, magnetic contact. Piezoelectric alarm,ultrasonic sensor,PZT ceramics,etc.
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