- Knowles/Sonion BA Combination
- CNC Aluminum Enclosure
- 8-wire Unidirectional Crystalized OFC x Silver Alloy cable
- High Quality 3.5mm Gold Plated Connector
- Hexagon Design Aluminum Spliiter
- Gold-plated 0.78mm 2-pin Connectors
Note: the ratings given will be subjective to the price tier. Definitely the expectations from a $15 IEM won’t be the same as a $150 one, and that’s the approach taken while assigning scores. Cayin was kind enough to send me the YB04 (courtesy of Andy Kong) as part of the review tour.