The KZ EDX is the company’s latest offering at their very low end. In 2014, KZ started with $5 single dynamic-driver earphones of remarkable quality…such as the EDR1 and EDR2, later the ATE and ATR….just to name a few. With the start of the “driver war” in early 2017, KZ neglected the single-dynamic driver altogether and focused on more and more drivers stuffed into their earpieces.
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https://www.audioreviews.org/kz-edx-review-jk/