I knew nothing about Yinyoo before the D2B4 arrived on my doorstep. Yinyoo are fine Chi-Fi fare. The D2B4’s been in my studio for a month or more and in my ears for a little less than that. It is made well, and it sounds damn good. 

Relevant links:

OHMAGE TO THE HIDIZS MS1 AND MS4
OHMAGE TO THE CAMPFIRE AUDIO ATLAS