6.8Score Yinyoo D2B4 Review Nathan April 26, 2019 IEM & Earphones, $101-200, Hybrid Universal 1 The Yinyoo D2B4 is a hybrid universal monitor consisting of two 10mm dynamic drivers and 4 balanced armature drivers. It is priced at a competitive $117. Disclaimer: The Yinyoo D2B4 sent to us is a sample in e...