I bought the Yersen Fen-2000 for a friend encouraged by the good opinions I had read about them. Also because they meet several requirements that my friend asked me: metal capsules, small, removable cable. I tried them when I received them, with their permission of course. And I was very upset by the medium high and the low bass (the peak in the 5Khz to which I am especially sensitive). This detail makes them unusable for me. I can support any other IEM of KZ (ZS5, ZS6, ZS10) before these. My friend said the same as me. He found a very metallic sound throughout the frequency range. For me it is the IEM that I like least of all the ones I have bought. And luck that they were not for me. But I'm sorry for my friend.
I checked with pure frequencies that the basses played correctly on both channels.
I want to think that there are different versions of this IEM and that some sound good.
Before buying it I reviewed frequency response graphs, all of them are always different. In this case the peak around 5KHz I found higher than what I saw in the graphics. Even knowing that a difference of more than 3dB in a sensitive area is a lot.
I will have to revise the graphs better in the future.
I checked with pure frequencies that the basses played correctly on both channels.
I want to think that there are different versions of this IEM and that some sound good.
Before buying it I reviewed frequency response graphs, all of them are always different. In this case the peak around 5KHz I found higher than what I saw in the graphics. Even knowing that a difference of more than 3dB in a sensitive area is a lot.
I will have to revise the graphs better in the future.