Overview

The KZ EDX Pro is a single-dynamic IEM using a 10 mm dual-magnetic-circuit driver with a detachable 0.75 mm 2-pin cable. The shell is resin with metal decorative elements, keeping weight low while enabling cable replacement and easy repairs. KZ lists core parameters (impedance 24 Ω, sensitivity 112 dB, stated bandwidth 10 Hz–20 kHz) on the official product page [1]. Third-party frequency-response (FR) data is publicly available and used below [2][3].

Scientific Validity

\[\Large \text{0.6}\]

Independent FR measurements show a classic V-shaped tuning: elevated bass, recessed mids, and enhanced upper-mid/low-treble energy. On an IEC60318-4 compliant coupler, the EDX Pro’s response departs from a neutral/transparent target by more than ±3 dB across the band, indicating it does not meet transparency criteria, though it remains usable and consistent for casual listening [2][3]. Manufacturer specifications report 24 Ω impedance, 112 dB sensitivity, and a stated 10 Hz–20 kHz range [1]. Public third-party THD data for this exact model is limited as of August 18, 2025; accordingly, the score reflects FR-driven fidelity with provisional weighting toward catalog specs for the rest.

Technology Level

\[\Large \text{0.3}\]

This is a conventional single dynamic-driver design. KZ’s “dual magnetic circuit” motor and other listed elements are incremental refinements rather than novel architecture; no evidence of category-advancing engineering (e.g., demonstrably lower distortion vs. peers) is presented in independent data [1][2].

Cost-Performance

\[\Large \text{1.0}\]

Denominator (review target): 18 USD (current Amazon US price 17.99 USD, rounded to 18 USD for consistency) [4].
Cheapest verified equal-or-better alternative: 7Hz Salnotes Zero at 20.69 USD (Linsoul US). It offers equal user-facing functionality (detachable 2-pin cable, wired IEM) and equal-or-better measured FR linearity on IEC60318-4 rigs [5][6]. No cheaper product with both equivalent functions and equal-or-better measured performance was found from reputable sellers at this time. Therefore CP = 1.0.

Reliability & Support

\[\Large \text{0.5}\]

Detachable cabling meaningfully improves serviceability versus fixed-cable sets. Build uses a resin shell with metal ornamentation; fit and finish are typical for the price. Warranty/support are standard for budget IEMs via retailers and KZ’s channels; no evidence of above-class reliability programs was found [1][4].

Rationality of Design Philosophy

\[\Large \text{0.7}\]

A simple, low-cost single-DD approach prioritizes replaceable cabling and mass-market tuning. Choices aim at broadly acceptable sound and repairability rather than speculative “tweaks,” which is a reasonable path for the price tier.

Advice

Prefer the EDX Pro if you want an inexpensive, lively V-shaped tuning with a detachable cable and widely available spares. If you prefer a more neutral/bright presentation and better FR linearity, 7Hz Salnotes Zero (20.69 USD) is a strong upgrade path [5][6]. For a slightly higher budget, Moondrop Chu II (22.99 USD) provides a compact shell and replaceable cable with broadly balanced tuning [7][8]. If vocal presence and midrange accuracy are your top priorities, consider those alternatives over the EDX Pro.

References

[1] KZ Audio — “KZ EDX Pro” product page. https://kz-audio.com/kz-edx-pro.html (accessed Aug 18, 2025). Listed specs: 24 Ω, 112 dB, 10 Hz–20 kHz; product features and construction.
[2] In-Ear Fidelity — “KZ EDX Pro” graph page. https://crinacle.com/graphs/iems/kz-edx-pro/ (accessed Aug 18, 2025). FR measurement on IEC60318-4 rig.
[3] In-Ear Fidelity — IEM Graph Database (method/rig notes). https://crinacle.com/graphs/iems/ (accessed Aug 18, 2025). Notes on IEC60318-4 measurement setup.
[4] Amazon US — “KZ EDX PRO in-ear monitor” listing. https://www.amazon.com/KZ-EDX-PRO-Headphones-Detachable/dp/B09F9R6P3J (accessed Aug 18, 2025). Price observed 17.99 USD.
[5] Linsoul — “7Hz Salnotes Zero” product page. https://www.linsoul.com/products/7hz-salnotes-zero (accessed Aug 18, 2025). Price observed 20.69 USD (3.5 mm, no mic).
[6] In-Ear Fidelity — “Salnotes Zero” graph page. https://crinacle.com/graphs/iems/salnotes-zero/ (accessed Aug 18, 2025). FR measurement on IEC60318-4 rig.
[7] MOONDROP Official — All Products (CHU II listed MSRP 22.99 USD). https://moondroplab.com/en/products (accessed Aug 18, 2025).
[8] Linsoul — “Moondrop Chu II” product page (price context). https://www.linsoul.com/products/moondrop-chu-ii (accessed Aug 18, 2025).

(2025.8.18)