Knowledge Zenith (KZ) have supplied the world with close to 50 budget earphone models since 2014. Almost all of them are V-shaped with a boosted upper midrange and this repetition has been the subject of forum discussions for the last 3-4 years. In order to release even more of the same, they created the spinoff brand CCA. Lately, KZ copied themselves by releasing essentially the same iem under the previous name “upgraded” by an “X”, namely the KZ ZSN Pro (X).
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https://www.audioreviews.org/kz-asx-review-jk/