The reasons are as follows:

1. The impedance of headphones is the abbreviation of AC impedance. The smaller the impedance, the easier it is for the headphones to produce sound and drive. ? The impedance of headphones changes.

2. On machines with headphone jack outputs such as desktop computers or power amplifiers, VCDs, DVD TVs, etc., it is generally more appropriate to use medium-high impedance headphones. If you use low-impedance headphones, you must first turn down the volume before plugging in the headphones, and then increase the volume little by little to prevent the headphones from being overloaded and causing them to burn out or the voice coil to be deformed and misaligned, causing broken sound.

3. Low-impedance headphones are generally easier to push, so portable, power-saving machines such as Walkmans and MP3 players should choose low-impedance headphones. At the same time, we should also pay attention to the high sensitivity. For Walkmans and MP3s, the sensitivity index is even more important.

4. Of course, headphones with higher impedance will sound better when paired with a sound source with high output power.

To sum up, the impedance of headphones is generally 32Ω or 16Ω.