Speaker technical indicators: sound technology
Hardware 3D sound technology is now more common, such as SRS, APX, Q-SOUND and Virtaul Dolby. Although they implement different methods, they can make people feel obvious three-dimensional effects, among which the first one is the most common. They all use extended stereo theory, which is to add additional processing to the sound signal through the circuit, so that the listener feels that the sound direction is extended to the outside of the two speakers, so as to expand the sound, which gives people a sense of space and three-dimensionality and a wider stereo effect. In addition, there are two sound enhancement technologies: active electromechanical servo technology and BBE high-definition plateau sound reproduction system technology, which also have certain effects on improving sound quality.
Speaker technical indicators: frequency response range
The full name of the frequency response range is called the frequency range and frequency response. The former refers to the range between the minimum effective playback frequency of the speaker system and the highest effective playback frequency; the latter refers to the sound pressure generated by the speaker as a function of frequency when an audio signal outputted with a constant voltage is connected to the system. Increasing or attenuating, the phase changes with frequency. The relationship between the sound pressure and phase and frequency is called the frequency response in dB (dB). The curves of sound pressure and phase lag with frequency are called "amplitude frequency characteristics" and "phase frequency characteristics", respectively, and are collectively called "frequency characteristics". This is an important indicator to check the performance of the speaker. It has a direct relationship with the performance and price of the speaker. The smaller the decibel value is, the flatter the frequency response curve, the smaller the distortion and the higher the performance.
Speaker technical indicators: sensitivity
This indicator refers to the sound pressure level measured one meter in front of the axis perpendicular to the speaker's horn when a 1W/1kHz signal is input to the speaker input. The unit of sensitivity is in decibels (dB). The sensitivity of the speaker is 3dB, the sound pressure of the output is doubled. The sensitivity of the ordinary speaker is in the range of 85~90dB, the low sensitivity is below 85dB, the sensitivity is above 90dB, and the sensitivity of the multimedia speaker is slightly lower.
Speaker technical indicators: power
The power indicator of the speaker is very confusing. Simply put, power refers to how powerful the sound from the speaker can be. According to international standards, power is marked in two ways: rated power and maximum withstand power (instantaneous power or peak power PMPO). The rated power refers to the continuous analog signal of the specified waveform in the rated frequency range, the maximum undistorted power that the speaker can emit, and the maximum withstand power is the maximum electric power of the speaker without any damage. The maximum power consumption of the speaker is mainly determined by the power of the power amplifier chip, and also has a great relationship with the power transformer. The weight difference between the main and sub-speakers can be roughly known about the weight of the transformer. Generally, the heavier the power is, the greater the power. But the power of the speaker is not the bigger the better, the application is the best, for the average home user's room of about 20 square meters, the true sense of 50W power is enough, there is no need to go too far to pursue high power.
Speaker technical indicators: distortion
The definition of the distortion of the speaker is basically the same as the distortion of the amplifier. The difference is that the input of the amplifier is an electrical signal, the output is still an electrical signal, and the speaker inputs an electrical signal, and the output is an acoustic signal. Therefore, the distortion of the speaker refers to the distortion of the electroacoustic signal conversion. The distortion of the sound wave is allowed to be within 10%, and the human ear is generally insensitive to distortion within 5%.
Speaker technical indicators: signal to noise ratio
This indicator refers to the ratio of the normal sound signal to the noise signal played back by the speaker. The signal-to-noise ratio is low, the noise is severe when the small signal is input, and the sound in the entire range is obviously murky. I don't know what sound is emitted, which seriously affects the sound quality.
Speaker Specifications: impedance
This indicator refers to the ratio of the voltage to current of the input signal. The input impedance of the speaker is generally divided into high impedance and low impedance. Generally, the impedance is higher than 16 ohms, the impedance is lower than 8 ohms, and the standard impedance of the speaker is 8 ohms.
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