Immerse yourself in an emotional sound experience and outstanding midrange reproduction. Ultra high resolution and amazingly wide soundstage accurately recreates the experience of live performances as if you were sitting right in the Carnegie Hall. The special dual driver design developed by HiFiMan offers smooth and seamless reproduction of different music frequency bands. 8.5mm for high/mid/upper bass. 9mm for low bass. A two-pin connector ensures a proper connection to the earpieces, while allowing for full range of movement. This design allows for easy replacement of different cables to best suit each individual's needs.