Analysis of Headphone Speaker Impedance
The impedance of the earphone changes with the frequency of the audio signal it reproduces, and the impedance of the earphone is generally the highest at low frequencies. This is easy to understand. The low-frequency sound field needs to activate all the headphone diaphragms to have a heavy bass feeling, so the playback source used has a more obvious attenuation of low-frequency.
1. The diameter of the speaker unit of the earphone is not as large as possible. The small one will require more delicate workmanship, and of course there will be limitations. The large speaker is often used for headphones and audio is convenient, and the output power and impedance are often different. higher.
2. The impedance of the earphone is the abbreviation of its AC impedance. Impedance refers to the resistance to alternating current in a circuit with resistance, inductance and capacitance, called impedance, and the unit is ohm (Ω). Generally speaking, the lower the impedance, the easier the earphones are to sound and drive.
3. The impedance of the headphone changes with the frequency of the audio signal it is replaying. Generally, the headphone impedance is the largest at low frequencies, so the attenuation of low frequencies is greater than that of high frequencies; for most headphones, increasing the output impedance will Makes the sound darker and more mixed (at this time the amplifier's control of the headphone driver unit will also be weaker), but some headphones need high impedance to sound better. If the headphone sound is sharp and harsh, consider increasing the effective output impedance of the headphone jack; if the headphone sound is dull and muddy, and is driven by a power amplifier, consider reducing the effective output resistance.
4. Headphones with different impedances are mainly used in different occasions. On desktops or power amplifiers, VCDs, DVDs, TVs and other equipment, high-impedance headphones are commonly used, and some professional headphones have impedances above 200 ohms. This is to Match with the headphone jack on the professional machine. If you use low-impedance headphones at this time, be sure to turn down the volume first, then plug in the headphones, and then turn up the volume little by little to prevent the headphones from being burned out due to overloading or the deformation of the voice coil. Breaking sound
