Talking about Keli new series unit sound: PK series headphones as a breakthrough product of Lili new factory, if described in two words, I think it is super value, its sound is neutral, the sound is not deliberately carved, the sound is thinner than the sound of Fengda series headphones, in fact, the thickness is more moderate, low Frequency is less than Fonda headphones, good dive, overall is very moderate sound, high-frequency analysis is better than Fonda headphones for a grade, which makes a lot of people who are used to listening to Fonda headphones feel a bit prickly new sound, this is not a problem, after the acclaim plus listening habits, on the whole, It is more suitable for enthusiasts, especially PK1 is the most, if you can not hear it well then you had better not say your own fever, ha ha. This brand of headphones is a very mature series, with high resistance, low resistance and standard impedance units, absolutely worth recommending products!