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Speaker seven major indicators detailed analysis

Time:2018-01-06 19:59Source:未知 Author:admin Click: Frequency
Speaker seven major indicators detailed analysis
 
Speakers on the market now thousands expensive, cheap thirty yuan can buy, so what kind of speakers can be regarded as a really good speaker? Especially for the speakers do not quite understand the "rookie" class friends, can only look at the appearance, listen to the business to put a little deafening music, only sensory feelings about; from the technical point of view, I do not know where to from Start with the pros and cons of speakers. Do not worry, the author below and talk about the speaker related performance indicators, I hope these contents will give you some advice in the purchase of speakers.
 
1. Frequency Range
 
The full name of the frequency response range is the frequency range and frequency response. The former refers to the speaker system between the minimum effective playback frequency and the maximum effective playback frequency range; the latter refers to a constant voltage output audio signal connected to the system, the speaker sound pressure generated by frequency changes occur Increasing or decaying, the phase changes with the frequency of the phenomenon, the sound pressure and phase and frequency of the relationship between the changes associated with the frequency response, in decibels (dB). The curves of sound pressure and phase lag with frequency are respectively referred to as "amplitude frequency characteristic" and "phase frequency characteristic", which are collectively referred to as "frequency characteristics". This is to test the pros and cons of the speaker performance is an important indicator, which has a direct relationship with the speaker performance and price, the smaller the decibel value shows the more flat the frequency response curve of the speaker, the smaller the distortion, the higher the performance. Such as: a speaker frequency response 60Hz ~ 18kHz +/- 3dB. Sometimes these two concepts do not distinguish between, called the frequency response. In theory, the composition of the sound of the harmonic components is very complex, not the wider the frequency range sounds good, but this is still quite right in the middle and low multimedia speakers is still correct. Now the speaker manufacturer of the system frequency response generally marked range is too large, high-frequency part of the difference is not a lot, but marked in the bass end is very unreal, so to remind everyone of the low-frequency sound must listen to the truth, do not believe it The value on the leaflet
 
2. Sensitivity
 
The indicator refers to the sound box input 1W / 1kHz input signal, the distance from the loudspeaker speaker plane in front of a vertical axis of the measured sound pressure level. Sensitivity in decibels (dB). The sensitivity of the speaker per difference 3dB, the output sound pressure on the difference between double the sensitivity of ordinary speakers in the 85 ~ 90dB range, 85dB below the low sensitivity, 90dB above for high sensitivity, the sensitivity is usually slightly lower multimedia speakers.
 
3. power
 
The simple indicator is that the feeling of the sound emitted by the speaker can have a lot of shocking. According to international standards, there are two kinds of power marking method: rated power and maximum power (instantaneous power or peak power PMPO). The rated power refers to the speaker within the rated frequency range provides a continuous analog signal waveform, the speaker can send the maximum non-distortion power, while the maximum power is the speaker does not cause any damage to the maximum power. Usually businesses in order to meet consumer psychology, music is usually marked a great power, so in the purchase of multimedia speakers to rated power prevail. The speaker's maximum power is mainly determined by the power amplifier chip power, in addition to power transformers have a great relationship.掂 a 掂 the weight of the main and sub speakers can roughly know the weight of the transformer, usually heavier power more. But the speaker's power is not the bigger the better, the application is the best, for ordinary home users about 20 square meters of room, the real sense of 50W power is enough, there is no need to over-pursuit of high power.
 
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4. Distortion
 
Amplifier distortion distortion amplifier definition and is basically the same, the difference is the amplifier input is the electrical signal, the output or electrical signals, and speakers input electrical signals, the output is the acoustic signal. Therefore, the speaker distortion refers to the distortion of the electro-acoustic signal conversion. The allowable range of sound wave distortion is within 10%, most people's ears are insensitive to the distortion within 5%. It is best not to buy speakers with distortion greater than 5%.
 
5. Signal to noise ratio
 
The index refers to the speaker playback of the normal sound signal and noise signal ratio. Signal to noise ratio is low, a small noise when the input signal is serious, the sound in the entire range obviously became muddy, I do not know what the sound is made, seriously affecting the sound quality. Speakers with a signal to noise ratio below 80dB (including subwoofers below 60dB) are not recommended.
 
6. impedance
 
The indicator refers to the input signal voltage and current ratio. The input impedance of the speaker is generally divided into high impedance and low impedance two types, generally higher than 16 ohm high impedance, less than 8 ohm low impedance, the speaker's standard impedance is 8 ohms. The nominal impedance of the market speakers 4 ohm, 5 ohm, 6 ohm, 8 ohm, 16 ohm and other several, although this indicator has nothing to do with the performance of the speaker, but it is best not to buy low impedance speakers, the recommended value is the standard Of the 8 ohm, because the amplifier with the same output power, low impedance speakers can get a larger output power, but the impedance is too low will result in underdamped and bass deterioration and so on.
 
7. Sound technology
 
Hardware 3D audio technology is now more common with several SRS, APX, Q-SOUND and Virtaul Dolby and so on, although they each achieve a different method, but can make people feel significant three-dimensional effect, of which the first one is the most common. They all use the Extended Stereo theory, which is the additional processing of sound signals through the circuit to make the listener feel the sound direction extended to the outside of the two speakers, so as to expand the sound and make people have a sense of space Three-dimensional, resulting in a broader stereo effect. In addition, there are two sound enhancement technologies: active electro-mechanical servo technology and BBE high-definition high-altitude sound reproduction system technology, to improve the sound quality also has some effect.
 
(Author:admin)