Peter's Electronics

Binary EP321-MEMS 6-Driver Tribrid IEM 2DD+3BA+MEMS Direct Drive Hi-Res Audiophile In-Ear Monitor Earphone HiFi Music Earbuds

$427.99 USD

~~$0.00 USD~~ $427.99 USD

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Color EP321 MEMS-4.4mm EP321 MEMS-3.5mm

SPECIFICATIONS

Active Noise-Cancellation: No

Category: Earphones & Headphones

Charging Method: cable

Communication: Wired

Control Button: No

Feature: HiFi In-ear Earphone

Features: Detachable Cable

Frequency Response Range: 8 - 40000

Function: HiFi Headphone,Monitor Headphone

Headphone Pads Material: Silicone

High-concerned chemical: None

Impedance Range: up to 32 Ω

Is wireless: No

Line Length: 1.2

Material: PC

Package List: User Manual,Carrying Bag,Replaceable Pads Set,Detachable Audio Cable

Plug Type: Line Type

Resistance: 13

Sensitivity: 122

Style: Wired in-ear headphones

Total Harmonic Distortion: 1

Vocalism Principle: Hybrid Technology

Voice assistant built-in: no

Volume Control: No

Waterproof: No

Wireless Type: None

With Microphone: No

💡About EP321 MEMS Driver👇

The EP321 is equipped with an ultra-compact MEMS tweeter unit, with a package size of only 15.4mm³, which may be the smallest MEMS speaker unit in the audio industry today. Based on PZT thin-film piezoelectric technology, the diaphragm and driving structure are integrated and fabricated entirely using MEMS processes. In terms of acoustic performance, it offers excellent high-frequency extension and can easily extend beyond 40kHz, delivering an exceptional sound quality experience that meets Hi-Res certification standards.

To achieve the required sound pressure level (SPL) technical specifications, existing piezoelectric MEMS speaker solutions on the market currently need an additional dedicated PA chip to maintain a high drive voltage. The new MEMS unit on the EP321 can easily achieve SPL≥100dB @ 6kHz~40kHz with just a 1Vrms drive voltage, meaning it can deliver high-fidelity treble audio directly using existing headphone driving equipment without PA amplification, significantly lowering the application threshold for new MEMS speaker technologies.

Benefiting from excellent MEMS structural design and semiconductor process capabilities, it has outstanding response speed and consistency in sound pressure level (±1dB) and phase (±1°). Unlike similar products in the audio industry that use surface mount and wire bonding packaging schemes, it adopts AAC's specially developed "quasi-flip-chip" packaging process, achieving high reliability while ensuring high performance and ultra-compact package size.

2DD+3BA+MEMS Tribrid Drivers

Binary EP321 features a six-driver tribrid setup each side: 10mm dynamic driver + 6mm passive diaphragm, 3 balanced armature drivers, and 1 direct drive MEMS driver. A professionally designed three-way frequency crossover ensures powerful, clean, and high-resolution sound performance.

Advanced Three-Types of Driver Configuration

Equipped with an advanced multi-driver configuration, combining dynamic, balanced armature, and MEMS technologies. The precise three-way crossover optimizes each frequency band, delivering wide dynamic range, rich details, and coherent, engaging sound across all music genres.

Direct Drive MEMS Technology

As the world’s first IEM with Direct Drive MEMS technology, it features a built-in energizer that powers the MEMS driver—no external amplifier needed. The MEMS unit is dedicated to the ultra-high-frequency band, delivering super-fast transients, clean and high-resolution performance with no sharpness.

Strong Details, Rich Tone

The composite high-frequency BA + MEMS design enhances detail retrieval and tonal richness. It accurately reproduces instrument timbre, maintains clarity in complex passages, and renders every note, overtone, and texture vividly for an immersive high-resolution listening experience.

Precise Imaging & Accurate Vocals

One full-frequency balanced armature driver delivers exquisite midrange details and accurate vocal reproduction. With precise soundstage imaging, vocals sound smooth, expressive, and lifelike—ideal for vocals, jazz, and acoustic music.

Active+Passive Composite Bass Module

Featuring a dual-dynamic bass module: 10mm dynamic driver + 6mm passive diaphragm. This setup produces strong, sensational bass with solid sub-bass rumble and punchy mid-bass, handled with full precision and no muddiness.

Sound Frequency Response

Boasts an ultra-wide frequency response of 8Hz~40kHz, with a smooth, linear curve. It delivers deep sub-bass impact and crisp, extended ultra-high frequencies, ensuring true-to-original audio without harsh peaks or dips.

Exciting Design & Lightweight Shells

Features CNC-machined stainless steel face panels with irregular geometric elements that reflect different colors at different light angles. Each earbud weighs only 7.5 grams, offering lightweight comfort for all-day listening.

High-Precision 3D Printed Ear Cavity

The ear housings are crafted using high-precision 3D printing with high-quality resin. The ergonomic shape fits naturally to the ear canal, ensuring a secure, pressure-free fit for long listening sessions and daily use.

Universal 0.78mm 2-Pin Connector

Equipped with standard 0.78mm 2-pin connectors for easily swappable detachable cables. The high-quality oxygen-free copper silver-plated cable ensures low-loss audio transmission, with 3.5mm/4.4mm termination plug options.

Related Specs: Connector Type: 0.78mm 2-Pin | Termination Plug: 3.5mm/4.4mm

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