Three Sets Of Faceplate, Three Frequency Crossover Options:
NE4 Evolution has three different sets of replaceable face covers bundled in the package. The Red face panel enhances the lower-end response and brings a punchy presentation that complements EDM, Pop, and similar genres. It adopts a three-way frequency division with one BA unit for low, one BA unit for mids, and two BA units for high-frequencies. Similarly the Black faceplates for reference sound with a three-way architecture with one BA for ultra-lows, one BA for a full-frequency response, and two BA for high-frequencies. The third Blue filter is for transparent sound with a two-way architecture, one driver for full-frequency response and two for high-frequency drivers. This third filter utilizes only three drivers with the pair.

Premium Knowles Balanced Armature Drivers:
Knowles is a well-renowned brand mostly known for its high-performance balanced armature drivers. NE4 Evolution adopts a four-driver configuration featuring Knowles 22955, Knowles 29689, and Knowles 31736(Composite) drivers per side. They deliver impeccable performance with high-resolution clarity and a wide sound field.

Pop Faceplate (Red):
Frequency Response: 9Hz-20kHz.
Sensitivity: 104dB/mW.
Impedance: 6Ω.

Reference Faceplate (Black):
Frequency Response: 18Hz-22kHz.
Sensitivity:108dB/mW.
Impedance: 10Ω.

Transparent Faceplate (Blue):
Frequency Response: 20Hz-30kHz.
Sensitivity: 110dB/mW.
Impedance: 22Ω.