audio-sound @ hatena

An audio review & news blog. The volume should not exceed 80 dB is recommended. I usually adhere to the safe-listening style by WHO. Please note that my aural impressions and interpretations of measurements are also made from a safe-listening style.

(News) Hidizs MD4: 4 Custom Balanced Armature Drivers 3-way Crossover HiFi In-ear Monitors

Hidizs MD4

Hidizs MD4


Hidizs has released its newest IEMs, Hidizs MD4, in a 4BA configuration.



  • 4 Custom-Designed BA Drivers
  • High-precision 3D printing straight acoustic sound structure
  • 3-way Crossover, 2-level tuning switch, 4 sound signatures
  • Elegance in Your Ears



  • Impedance: 8Ω@1khz
  • Frequency response range: 20Hz-40kHz
  • Sensitivity: 102dB±1dB@1kHz
  • plug: 3.5mm termination plug
  • Driver: 4 Custom-Designed BA Drivers


4 Custom-Designed BA Drivers

Combining 4 Hidizs Custom Balanced Armature drivers to bring you acoustic charm, developed and tuned for years by Hidizs professional audio team, with evolved sound range performance. One custom BA driver for high frequencies: get higher resolution and more extension, crisper sound, and richer details. One custom BA driver for midrange: more body for the mids, more power, and presence. Intoxicating texture, unbelievable vocals. Two custom BA drivers for low frequency: double power to stimulate thicker bass, incredible depth, tight response, and rich texture.


High-precision 3D printing straight acoustic sound structure

Redesigned internal audio transmission structure, high-precision 3D printing straight acoustic sound tube, ensures continuous and clean audio output of the custom-designed 4-BA drivers, reduce overlap and interference of sounds between multiple drivers. Effectively increasing sound density, reduce distortion and harmonic resonance. Ensure accurate audio crossover, excellent performance and layering!


3-way Crossover, 2-level tuning switch, 4 sound signatures

MD4 accurately calculates the connection of different frequency bands, reasonably allocating high, ultra-high, medium, and low frequencies, increased accuracy and clarity for all, mutually balanced and harmonized. Hidizs' decades of experience in acoustic tuning ensure MD4’s outstanding performance in different frequency bands.

Electronic crossover tech to facilitate switching between four different sound styles, with a 2-level tuning switch, easily switching between high & low impedance.
HIDIZS MD4 HiFi IEMs, 4 sound signatures that work well with all music genres.


  • Balanced: Classic Hidizs tuning, suitable for most people's listening styles.
  • Warm: excellent performance at all frequencies, stronger musical sense. Suited for folk & pop music.
  • Treble: remarkable highs/ultra-high. Suited for rock and electronic music
  • Bass: boosted bass with excellent speed and a tight response. Suited for symphony and classical music.


Hidizs MD4, balanced armature drivers IEMs full of ambition, accommodating different listening preferences, as well as changes in preference over time.


Elegance in Your Ears

laser-cut and hand-polished, with the beautiful amber finish; lined with EU IIA certified medical-grade skin-friendly resin. Aluminum-alloy CNC integration, rose-gold middle frame, celluloid faceplate, and aluminum alloy output nozzle. Make the most of Hidizs’ industry-leading metalworks, trendy elegance with guaranteed output purity and stability for reduced harmonic resonance and distortion.


More Comfortable Wearing

The headphone connector adopts an elbow design for more suitable for the human ear curve and ergonomic, optimizing the wearing experience. Cable sockets use gold-plated materials for more stable and smooth audio transmission.


Superior Cable

60 high-purity silver wires + 60 high-purity oxygen-free copper wires tightly twisted in four strands to keep it nice and light in appearance, and for better performance in sound. Silver wires for a brilliant and clean sound. Copper wires for added smoothness and gentle performance. Standard 0.78mm 2pin designs are retained for good cable suitability and compatibility. Thus you could enjoy further upgraded sound or get more listening experiences, created by different cables with the same specifications.


Price & Availability

Hidizs MD4 is now available at Linsoul and other retailers for $189.


Hidizs MD4

Hidizs MD4

Hidizs MD4