The Astell & Kern ZERO2 Advanced Quad-Brid IEM Headphones offer incredible hi-res audio. These silver headphones boast an unparalleled four-driver configuration featuring a planar balanced armature dynamic & piezoelectric driver for immersive sound. The ZERO2 headphones combine these separate driver technologies to deliver incredible audio across a wide range of frequencies. With precise CNC machined metal housing the ZERO2 headphones provide premium durability & splendid comfort. Enjoy perfectly tuned audio thanks to the Super Low Noise Cross-Over Network. This feature reduces distortion & enhances the separation of instruments & vocals delivering an optimum listening experience. The robust acoustic chamber created using 3D printed technology eliminates unwanted resonance & creates an ultra-realistic sound that optimises your favourite music. Magnify your listening experience with the impeccable pure silver-coated OFC cables & MMCX connectors which are primed to be plugged into your Astell & Kern portable media player (sold separately). The ZERO2 headphones promise superb listening quality that is sure to captivate any audiophile.