[Headphone Impedance]What is the meaning of the headphone impedance? In circuits of resistance, inductance and capacitance, the resistance to alternating current is called impedance, and the unit is ohm (Ω). Generally speaking, the lower the impedance, the easier the earphones are to sound and drive.
The impedance of the headphone changes with the frequency of the audio signal it is replaying. Generally, the impedance of the headphone 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 make the sound darker and more mixed (the amplifier will also have less control over the headphone driver), but some headphones require higher 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.
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 of 200 ohms. The above is to match the headphone jack on the professional machine. If you use a low-impedance headphone at this time, you must first turn down the volume, then plug in the headphone, and then turn up the volume little by little to prevent the headphone from being overloaded and burning out or The voice coil is deformed and dislocated, resulting in broken sound.
Impedance
Impedance does not refer to the resistance of the earphone itself. After impedance matching, the power shared by the headphones can be increased. The smaller the self-resistance, the easier it is to drive the earphone; the greater the self-resistance, the harder it is to drive. The impedance of the general Walkman earphone is 16Ω-64Ω. Generally, the impedance of headphones is the largest at low frequencies, and the attenuation of low frequencies is greater than that of high frequencies. For most headphones, increasing the output impedance will make the sound darker and more mixed (the amplifier will also have less control over the headphone driver), but some headphones require higher impedance to sound better. The sound of headphones with too much impedance will sound a bit mixed, and for various portable players such as CD, MD or MP3, low impedance headphones (usually less than 50 ohms) are generally used, because these low impedance headphones are easier Drive, at the same time pay attention to the high sensitivity, for Walkman, MP3, MP4, CD, the sensitivity index is more important. Of course, within a certain limit, the sound effect is better when headphones with high impedance are matched with audio sources with high output power.
The size of the headphone impedance is also closely related to the sound quality of the headphone. The impedance changes with the frequency. The impedance of the headphone is smaller at low frequencies and larger at high frequencies, so for most headphones , increasing the impedance will make the sound darker.
