The characteristics of high fidelity audio mainly from: frequency response, signal noise ratio, dynamic range, distortion, stereo separation, stereo balance. These aspects of view.
1 frequency response:
Refers to the frequency range of audio equipment, and the relationship between the amplitude and frequency of sound wave. General detection of this index to the frequency range of 1000Hz as a reference, and with the logarithm of dB (DB) to indicate the magnitude of its frequency. The overall frequency response of the sound system should be 20~20000Hz in theory, but in practical use, because of the circuit structure, the quality of components and other reasons, it is generally at least 32~18000Hz. Frequency response range as wide as possible.
2 signal to noise ratio:
The signal-to-noise ratio refers to the ratio of the new sound system noise generated in the audio file playback. The noise mainly include thermal noise, AC noise, mechanical noise and so on, which directly affect the reproduction of the audio system. Consumers in test instrument can be no input signal in the power amplifier, proper open large volume potentiometer, and close to the speaker if you don't hear any noise, noise of the sound system of the small, the signal to noise ratio.
3 dynamic range:
Dynamic range is the ratio of the maximum output power and the output power of the system when the sound system is reproducing. The unit is dB (DB). The dynamic range of the sound system with good general performance is above 100dB.
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