Impedance: Note the difference with the meaning of resistance. In the world of direct current (DC), the effect of objects on current blocking is called resistance, but in the field of alternating current (AC), in addition to resistance blocking current, capacitance and inductance It also hinders the flow of current. This effect is called reactance, and the impedance we call daily is the sum of resistance and reactance in the vector. Generally speaking, low-impedance earphones are better to push, but when using it, you must first turn down the volume and then plug in the earphones, and then turn up the volume a little bit, so as to prevent the earphones from overloading and burning the earphones or distorting the voice coil. Causes broken sound, so portable, power-saving devices such as walkman should choose low-impedance headphones, and also pay attention to the high sensitivity, which is more important for the Walkman.
Sensitivity (SensiTIvity): the sound pressure level that the earphone can emit when the power input to the earphone is 1 milliwatt (the unit of sound pressure is decibel, the greater the sound pressure, the greater the volume), so the higher the sensitivity and the lower the impedance, the earphone The easier it is to make sound, the easier it is to drive.
Frequency response (Frequency RespONse): The sensitivity value corresponding to the frequency is the frequency response, and the image is the frequency response curve. The range that human hearing can reach is about 20Hz-20000Hz. At present, the mature earphone technology has reached this Claim
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