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What are the speaker technical indicators

2021-02-22 70
The speaker is the terminal of the entire sound system, and its function is to convert audio energy into corresponding sound energy and radiate it to the space. The following is a small editor to share the technical indicators of the speakers, welcome to read and browse.

Sound effect skills
Hardware 3D sound effects are now more common in SRS, APX, Q-SOUND, and Virtaul Dolby. Although they have different ways to complete them, they can all make people feel a significant three-dimensional effect. One is the most common. They all use the Extended STereo theory, which is the additional processing of the dynamic and static signals through the circuit, so that the listener feels that the dynamic and static directions are extended to the outside of the two speakers, so as to expand the dynamic and static, so that people have a sense of space and space. The three-dimensional effect produces a wider stereo effect. In addition, there are two sound enhancement skills: active electromechanical servo skills and BBE high-definition plateau sound reproduction system skills, which also have a certain effect on improving sound quality.

Frequency response scale
The full name of frequency response scale is called frequency scale and frequency response. The former refers to the scale between the lowest useful playback frequency and the highest useful playback frequency of the speaker system; the latter refers to the sound pressure generated by the speaker when the audio signal output at a constant voltage is connected to the system. The scene of increasing or attenuating, and the phase changing with frequency, this sound pressure and phase and frequency related changes are called frequency response, in decibels (dB). The curves of sound pressure and phase lag changing with frequency are called "amplitude-frequency characteristics" and "phase-frequency characteristics", collectively called "frequency characteristics". This is one of the main goals to examine the function of speakers. It is directly related to the function and price of the speakers. The smaller the decibel value, the flatter the speaker's frequency response curve, the smaller the distortion, and the higher the function. For example, the frequency response of a speaker is 60Hz~18kHz+/-3dB. These two concepts are sometimes not different, and are called frequency response. Theoretically speaking, the harmonic components that make up the movement are very complicated. It is not that the wider the frequency scale is, the sound will be better. However, this is still fundamentally accurate in terms of medium and low-end multimedia speakers. Today's speaker manufacturers have too much system frequency response throughout the scale of the label, and the high frequency is not very bad, but the label on the low end is extremely unreal, so we must be heard for the low-frequency movement, not easy Trust the value on the leaflet.

Sensitivity
The target refers to the sound pressure level measured in a local area one meter in front of the straight center axis of the speaker speaker when a 1W/1kHz signal is input to the speaker input terminal. The unit of sensitivity is decibel (dB). For every 3dB difference in the sensitivity of a speaker, the output sound pressure will double. Usually the sensitivity of a speaker is in the range of 85-90dB, below 85dB is a low sensitivity, and above 90dB is a high sensitivity, and the sensitivity of a multimedia speaker is usually slightly lower.

power

The power indicator of the speakers is very confusing. Simply put, power refers to how powerful the dynamic and static energy announced by the speaker is. According to international standards, there are two ways to indicate power: additional power and maximum received power (instant power or peak power PMPO). The additional power refers to the maximum undistorted power that the speaker can declare for a continuous analog signal with a regular waveform in the additional frequency scale, and the maximum received power is the maximum electrical power that the speaker does not cause any damage. In order to cater to consumers' psychology, businesses usually set a large standard for music power, so the extra power should be used when purchasing multimedia speakers. The maximum received power of the speaker is mainly determined by the chip power of the power amplifier, and is also closely related to the power transformer. You can roughly know the component of the transformer by taking a look at the component difference between the main and sub-speakers, usually the heavier the greater the power. However, the power of the speaker is not as large as possible, and the application is the best. For a room of 20 square meters or so, the real power of 50W is sufficient for household users. There is no need to go overboard and seek high power.


What are the speaker technical indicators


Distortion
The definition of the distortion of the speaker is basically the same as that of the amplifier. The difference is that the input of the amplifier is an electrical signal, but the output is still an electrical signal, while the input of the speaker is an electrical signal and the output is a sound wave signal. Therefore, the distortion of the speaker refers to the distortion of the electro-acoustic signal conversion. The allowable scale of sound wave distortion is within 10%, and the human ear is usually not sensitive to distortion within 5%. It is best not to purchase speakers with distortion greater than 5%.

Signal to noise ratio
The target refers to the ratio of the normal motion and static signal to the noise signal played back by the speaker. The signal-to-noise ratio is low, and the noise is severe when a small signal is input. The movement in the entire sound range becomes significantly dirty and unclear. I don't know what sound is being sent, which severely affects the sound quality. Speakers with a signal-to-noise ratio below 80dB (including subwoofers below 60dB) are recommended not to be purchased.

impedance
The target refers to the ratio of the voltage to the current of the input signal. The input impedance of a speaker is usually divided into high impedance and low impedance, usually higher than 16 ohms is high impedance, lower than 8 ohms is low impedance, and the standard impedance of the speaker is 8 ohms. The nominal impedance of speakers in the shopping mall has 4 ohms, 5 ohms, 6 ohms, 8 ohms, 16 ohms, etc. Although this goal has nothing to do with the function of the speakers, it is best not to purchase low-impedance speakers. The recommended value is the norm. This is because when the power amplifier is the same as the output power, a low-impedance speaker can obtain a larger output power, but if the impedance is too low, it will cause underdamping and low sound degradation.
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