Some reviewers have difficulty to wear RE262 earphone deep enough so that they can not hear enough bass. We did a lot of research on this problem. Finally we found an easy solution: modified the bi-flange. Pls check the following picture. Cut the smaller flange 2mm off, all bass will come back. In the 1st batch RE262 we will provide four hand-modified bi-flange in each RE262 box. We are manufacturing the improved bi-flange now. All hifiman RE262 will use the machine-made improved bi-flange from April.