The main specifications for the KZ ZSN Pro and ZSN Pro X are very similar, both featuring a 10mm dynamic driver and a customized 30095 balanced armature driver. The ZSN Pro X lists a slightly higher impedance of 25Ω compared to the ZSN Pro’s 24Ω, but both share the same 112dB/mW sensitivity, meaning they are easy to drive from smartphones or tablets. Key differences include a more refined and durable zinc alloy faceplate with a lighter feel on the ZSN Pro X, improved ear tips, and a new silver-plated flat cable option for the X model, making it a worthy upgrade in build quality and aesthetics over the original ZSN Pro.