Table of headset parameters

Frequency response: Refers to the range of frequencies that the headset can represent. The typical value is 20-20,000 Hz(bass to treble), while 12-39,000 Hz means that the headset can represent more audio detail and sound "more authentic";  30-17,000 Hz means that the headphones can't pick up details below 30Hz, making the bass sound "heavy" and similar for the treble.  

Total harmonic distortion: indicates the sound quality of the earphone is smooth, clear and fidelity. The average earphone is about 0.7%. The smaller the value, the better. 

Sensitivity: The higher this value, the greater the sound at the same output power of the audio source;  The sensitivity of walkman earphones is higher than that of monitor earphones, around 110dB, so for walkman earphones, the higher the value, the better.  

Connection: the high-grade walkman earphone attaches great importance to the wire, different wire has a greater impact on sound quality;  Another important issue is the length of the cord. When you're shopping, you need to fully estimate the length that works for you. If you're going to always wear your MP3 player around your neck or in your jacket pocket, go for a short cord, and if you're going to wear it in your bag or pants pocket, go for a long cord.