Introduction: This is a technical review of the earphone Sony Mdr-Ex1000 (Exk for short). This earphone from 2010s features some unique designs. With balanced performance across the hearing range and an open-sounding neutral tuning it is not hard to understand where all the praises over the years are coming from. In this review we try to discuss what the nature of this earphone is and some of the characters that makes it stand out. I. Sound quality: Openness in Sound-staging: The tuning of the Exk is a diffused-field neutral one. It has a open...