Knowledge Zenith, commonly known as KZ or KZ Acoustics, is a Chinese audio manufacturer based in the Dongguan/Shenzhen area of Guangdong, China. The company was founded in 2008 by Keith Yue, a former Audio-Technica engineer, and Zen Li, a classically trained musician, and operates under Shenzhen Yuanze Electronics. It initially sold through Taobao before expanding globally through platforms such as AliExpress, Amazon, and specialist audio retailers.

KZ focuses almost exclusively on in-ear monitors, making its name producing multi-driver hybrid IEMs at aggressive price points. Breakthrough models like the KZ ZST popularized the idea of affordable dynamic-plus-balanced-armature hybrids, and the brand has continued that approach with widely discussed releases such as the ZSN, ZS10 Pro, AS10, AS16, ZAS, and the flagship KZ Zenith. The lineup has expanded over time to include true wireless earbuds, detachable upgrade cables, and Bluetooth modules compatible with KZ's two-pin IEMs.

Within the enthusiast community, KZ is closely associated with the "ChiFi" movement — budget Chinese-made IEMs sold direct to consumers and extensively reviewed on forums like Head-Fi and subreddits such as r/HeadphoneAdvice. The brand is generally regarded as an entry point for listeners experimenting with multi-driver IEMs and aftermarket cables rather than a studio or stage monitoring supplier used by professional touring artists.

Knowledge Zenith has 2 products cataloged on Equipboard, including Headphones & In-Ear Monitors.