Color:AST Black without Mic New upgrade of the new generation of balanced armature First Upgrade The new 30017s balanced armature combination make a rapid increase in medium and high frequency. Sustained sound capture is in place, and the high degree of reduction and separation brings an on-the-spot experience of exquisiteness. Second Upgrade The low-frequency energy of the new 22955s balanced armature unit is equivalent to three ordinary balanced armature. With excellent bass ability, the 7hz-600hz frequency response is outstanding, which is by no means inferior to the traditional dynamic unit, and it has real quality and rich bass. Third Upgrade Deep optimization of the middle frequency of the new 29689s balanced armature unit Fourth Upgrade The deep optimization of the mid-range gives the human voice clearer and more details. The instrumental music interpretation is flexible and natural, and is very durable.