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Teach you how to choose their own sound!

Acoustics probably includes amplifiers, peripherals (including pressure limiters, effects, equalizers, VCDs, DVDs, etc.), speakers (speaker, speaker) mixers, microphones, display devices and so on. Among them, the speaker is the sound output device, speakers, subwoofer and so on. A speaker, including high, low, three speakers, three are not necessarily three. Sound system overall technical indicators of the merits of the performance, depending on the performance of each unit itself is good or bad, if the system of each unit of the beats by dre on sale technical indicators are high, then the overall system of the technical indicators are good. The technical indicators are mainly six: frequency response, signal to noise ratio, dynamic range, distortion, transient response, stereo separation, stereo balance. The so-called frequency response refers to the audio equipment playback frequency range and amplitude of sound waves with the frequency changes. General Test This indicator refers to the frequency range of 1000Hz and uses the logarithm to indicate the amplitude of the frequency in decibels (dB). The overall frequency response of the audio system theoretically requires 20 ~ 20000Hz. In actual use due to the circuit structure, the quality of components and other reasons, often can not meet this requirement, but generally at least reach 32 ~ 18000Hz.

The so-called signal-to-noise ratio refers to the sound system audio source software playback sound and the new system to generate a new ratio of noise, the noise is mainly thermal noise, AC noise, mechanical noise and so on. General test This indicator is expressed in decibels (dB), which is the logarithmic ratio of the rated output power of the reproduced signal to the system noise output power at the beats earbuds time of no signal input. The signal to noise ratio of the general audio system needs beats by dre on sale to be above 85dB. Dynamic range is the logarithm of the ratio of the maximum undistorted output power to the system noise output power at static state during playback, in decibels (dB). Sound systems with better general performance have a dynamic range above 100 (dB). Distortion refers to the cheap beats headphones audio system to replay the source signal, so that some of the original source signal (waveform, frequency, etc.) has changed. Audio system distortion mainly in the following categories: A shield beyond the m20 audio harmonic distortion: The so-called harmonic distortion refers to the audio system replays the sound more than the original source of extra harmonic content. This additional harmonic component signal is the frequency multiplier or divider of the source frequency which is caused by the non-linearity of the negative feedback network or amplifier. Harmonic distortion of the hi-fi system should be less than 1%. Intermodulation Distortion: Intermodulation distortion is also a kind of nonlinear distortion. It is a mixture of two or more frequency components that are mixed according to a certain ratio. The signals of the different frequencies are modulated with each other to generate a newly added non-linear signal after passing through the audio equipment. Include the sum and difference signals between the various signals. Transient Distortion Transient distortion, also known as transient response, occurs mainly when a large transient signal is suddenly applied to the amplifier because the amplifier reflects more slowly, distorting the signal. Generally enter the square wave signal through the playback device, observe the amplifier output signal envelope waveform is similar to the input square waveforms to express the amplifier's ability to follow the transient signal.

Stereo resolution represents the isolation between the left and right channels of the stereo system, which in fact reflects the degree of crosstalk between the left and right channels. If the crosstalk between the two channels is large, the stereophonicity of the playback sound will be weakened. Stereo balance indicates the difference between the left and right channel gains in a stereo playback system. If the unbalance is too great, the pan position of the playback stereo will be offset. Stereo balance of high quality audio system should be less than 1dB.