If you haven’t been staying abreast of the recent developments in the IEM market, hoo boy, have I got some good news for you. For a while, I was strictly an over-ear guy. Then, sometime last year, I started receiving review units for IEMs. My realization of the sheer quantity of cheap, new, high-quality IEMs out there was a shocking revelation, akin to waking up from deep cryostasis in the year 3000. The KZ ZSN (KZ standing for “Knowledge Zenith”), a $23 IEM, stands at the forefront of this wave. I had heard of these before, but I never had any reason to purchase them. So when they showed up at the MajorHifi headquarters, I was excited.
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https://majorhifi.com/kz-zsn-hifi-review/