High-end sound quality
KZ ED9 using a vibrating membrane is one of the diaphragms that can cover the whole range in the micro area. With its sensitive and rapid response force, it can be a vocal interpretation of the IF purer, burst out at the same time a very dynamic sense of bass texture, from high to low frequency IF then, reflecting the two-unit, three units.
Other headphones can not match the performance of the coherence smoothness.