Talking about Sound Frequency Range and Frequency Response

　　[Definition of frequency range and frequency response]

　　Frequency range refers to the range between the lowest effective playback frequency and the highest effective playback frequency that can be replayed by the audio system; Frequency response refers to the phenomenon that when an audio signal output with constant voltage is connected to the system, the sound pressure generated by the speaker increases or decays with the change of frequency, and the phase changes with frequency. This kind of change relationship (variation) of sound pressure and phase with frequency is called frequency response, in decibels (Db).

　　[Discrimination of audio system frequency]

　　The frequency characteristics of audio systems are usually described by the frequency response curves of the vertical coordinate of the decibel scale representing the power and the horizontal coordinate of the logarithmic scale representing the frequency. When the sound power is 3dB lower than the normal power, this power point is called the high-frequency cutoff point and low-frequency cutoff point of the frequency response. The frequency between the high-frequency cut-off point and the low-frequency cut-off point is the frequency response of the equipment; The curve of sound pressure and phase lag changing with frequency is called "amplitude frequency characteristic" and "phase frequency characteristic" respectively, and collectively called "frequency characteristic". This is an important indicator to evaluate the performance of speakers. It has a direct relationship with the performance and price of speakers. The higher the decibel value, the flatter the frequency response curve, the smaller the distortion, and the higher the performance. For example, the frequency response of a speaker is 60Hz ～ 18kHz +/- 3dB. Sometimes these two concepts are not distinguished, so they are called frequency response.

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