EarAcoustic STA-Hi End Series IEM – Redefining Audiophile Performance

Engineered for Audiophile Precision and Power

Introducing the EarAcoustic STA-Hi End Series IEM, where state-of-the-art acoustic engineering meets unmatched musical detail. Designed for audiophiles and sound professionals, the STA series features a dual-core dynamic driver system with Tesla-grade magnetic coils that deliver exceptional power and control across the full frequency spectrum.

A four-unit bilateral driver configuration—powered by N50+N50 magnetic tech—creates breathtaking resolution, dynamic clarity, and a wide soundstage. Experience deep, controlled bass from the 10mm large dynamic coil, and extended highs through a 6mm micro driver, delivering an immersive sound signature from 10Hz to 30kHz.

STA-Hi End – Ultra-Fast and Natural Transient Sound

The STA-Hi End model features a dual-diaphragm design, combining a 10mm beryllium-plated diaphragm and a 6mm polymer composite diaphragm. With an elastic modulus of approximately 300 GPa, the beryllium plating ensures superior transient response, fast signal recovery, and natural tonal balance. Whether it's jazz, classical, or EDM, the STA-Hi End responds with remarkable agility and precision.

STA-Hi End MAX – Durability Meets Sonic Excellence

For even greater resilience and performance, the STA-Hi End MAX upgrades to a 10mm DLC (diamond-like carbon) diaphragm, paired with the same 6mm polymer composite diaphragm. With a higher modulus of around 400 GPa, the DLC driver delivers ultra-fast signal response, reduced distortion, and smoother frequency transitions—ideal for high-resolution tracks and demanding mixes.

Acoustic Tuning That Merges Science with Emotion

Each unit is the result of hundreds of simulation experiments, resulting in a precision-engineered acoustic cavity optimized for resonance and warmth. The target frequency response curve is designed to reproduce music as the artist intended—with rich emotional depth and minimal distortion.

Key Acoustic Specs:

• THD < 0.5% for pure, accurate tonality

• Sensitivity > 110 dB/mW for effortless drive from any source

• Intermodulation distortion < 0.05% for clean, consistent audio

• Transient response < 3ms ensures snappy and clear transients

• Low-frequency rebound ≈ 50ms gives depth and presence to bass

• Signal attenuation < 0.5dB maintains clarity across the range

Craftsmanship Meets Durability

Aesthetically refined with a premium electroplated ABS resin cavity and a zinc alloy frame, the STA series features a metal-coated resin process for a glossy, high-end finish. It’s built not only to sound good but to look stunning and last long.

High-Fidelity Interchangeable Cable System

Each STA model includes a detachable high-definition audio cable made from oxygen-free copper and copper-plated silver. With a soft texture, tangle-free design, and up to 408 strand cores, this cable ensures stable, detailed, and high-resolution transmission. The 0.78mm dual-pin connector and 2.5mm single wire diameter offer durability and easy upgrades.

Why Choose the EarAcoustic STA-Hi End Series?

Whether you’re a critical listener, studio producer, or an audiophile seeking the perfect balance of power, precision, and warmth—the STA-Hi End and STA-Hi End MAX deliver it all. Backed by meticulous design, cutting-edge materials, and premium finishing, the STA Series is a masterpiece of in-ear monitor innovation.