The Zen is a phenomenal sounding IEM that is able to deliver an emotional and musical sound with clean bass, upfront midrange and smooth treble. The soundstage is holographic and provides an enveloping feeling. There is excellent depth and width. In addition, the Zen is constructed well with stainless steel shells and it comes with a nice cable. The Dunu Zen sets a benchmark for single dynamic IEM with its impressive sonic performance.