Knowledge Zenith is a Chinese company that has provided us with budget earphones since 2014. Their early $5-10 single DDs are legendary (here a comprehensive summary by the Contraptionist). Since 2017, they have also brought us cheap multi-driver hybrids with up to 10 drivers per side. The price of balanced armature drivers had dropped dramatically to make this happen. The company will issue their 50th model anytime soon.
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https://www.audioreviews.org/kz-zsn-pro-x-review-jk/
