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Product Snapshot
🌍 World’s First Direct Drive MEMS Hybrid IEM
🔊 Six-Driver Tribrid Configuration (Per Side)
⚡ 1× Direct Drive MEMS Driver
🔥 Dual Dynamic Bass System (Active + Passive)
🎯 3× Balanced Armature Drivers
🎚️ Three-Way Precision Frequency Crossover
🎶 Rich Tonality with High-Resolution Detail
🛠️ Stainless Steel Face Panels with Geometric Design
🖨️ High-Precision 3D-Printed Ergonomic Shells
🔌 Detachable Cable with 0.78mm 2-Pin Connectors
🎧 Premium Stock Ear Tips Included
Description
Binary EP321 MEMS Tribrid IEM – World’s First Direct Drive MEMS Hybrid In-Ear Monitors
The Binary EP321 MEMS Tribrid IEM marks a major breakthrough in in-ear monitor technology. Designed by Binary, the EP321 is the world’s first IEM to feature Direct Drive MEMS driver technology, delivering an ultra-high-resolution listening experience with exceptional speed, clarity, and tonal accuracy.
At its core, the EP321 uses a six-driver tribrid architecture per side, combining the physical impact of dynamic drivers, the precision of balanced armatures, and the lightning-fast response of a MEMS driver. Every element is carefully tuned using a professionally engineered three-way frequency crossover, resulting in a sound signature that is detailed, rich, engaging, and effortlessly musical.
Powerful, Clean & High-Resolution Sound Performance
The Binary EP321 features a meticulously arranged 321 driver configuration—three Balanced Armature drivers, two Dynamic-based drivers, and one MEMS driver—cleverly reflected in its name.
Each driver plays a dedicated role, ensuring outstanding separation, accurate imaging, and an immersive soundstage. Whether you’re listening to acoustic recordings, electronic music, or complex orchestral arrangements, the EP321 reproduces sound with authority and finesse.
Direct Drive MEMS Technology – A True Industry First
The highlight of the EP321 is its Direct Drive MEMS driver, engineered with a built-in energizer that eliminates the need for external amplification. Designed specifically for the ultra-high-frequency region, this MEMS driver delivers:
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Super-fast transients
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Exceptionally clean treble extension
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High micro-detail retrieval
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Zero harshness or fatigue
The result is a treble response that audiophiles crave—airy, precise, and incredibly natural.
Dual-Driver Bass Module – Dynamic + Passive Radiator
For the low frequencies, Binary integrates a 10mm dynamic driver paired with a 6mm passive diaphragm, forming a powerful bass module. This configuration produces:
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Deep, textured sub-bass rumble
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Punchy and controlled mid-bass
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Excellent speed with minimal distortion
Bass remains impactful yet clean, never bleeding into the mids.
Three Balanced Armature Drivers for Natural Mids & Detail
Supporting the bass and treble performance are three high-performance Balanced Armature drivers:
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One full-range BA for detailed, natural mids
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A composite dual-BA setup for smooth and extended high frequencies
Working in harmony with the crossover network, these drivers ensure seamless integration across the entire frequency spectrum.
Premium Design & Ergonomic 3D-Printed Shells
Visually, the Binary EP321 is just as striking as it sounds. The IEMs feature CNC-machined stainless steel face panels with irregular geometric patterns that shimmer and change colour under different lighting angles.
The shells are crafted using high-precision 3D printing, offering excellent structural integrity and long-term wearing comfort—ideal for extended listening sessions.
Technical Specifications
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Driver Setup: 10mm Dynamic Driver + 6mm Passive Diaphragm + 3BA + 1 MEMS
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Impedance: 13Ω @1kHz
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Sensitivity: 122dB/Vrms
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Frequency Response: 8Hz – 40kHz
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THD+N: <1%
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Connector Type: 0.78mm 2-Pin
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Termination Plug: 3.5mm / 4.4mm
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Weight: 7.5g (per side)
Driver Setup: 10mm Dynamic Driver + 6mm Passive Diaphragm + 3BA + 1 MEMS
Impedance: 13Ω @1kHz
Sensitivity: 122dB/Vrms
Frequency Response: 8Hz – 40kHz
THD+N: <1%
Connector Type: 0.78mm 2-Pin
Termination Plug: 3.5mm / 4.4mm
Weight: 7.5g (per side)
Warranty Period: 1 Year from the date of Invoice
Covered: Manufacturing Defects Only
Warranty Form: https://www.theaudiostore.in/pages/warranty-claim-form Cable: 1-month warranty only for manufacturing defects only
Binary Acoustics has been dedicated to enhancing sound quality since 2017. Our mission is to attain the utmost compact size and a sleek design. We craft our products based on the philosophy of "Let your ears convey sound and emotion." Our innovative designs seamlessly integrate with the ears during musical experiences, enabling users to immerse themselves fully in the realm of music and feel the authentic, pure sound.
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from 7673 reviews
Various reviews on the net created a lot of desire and interest to possess this iem.
Hitherto iv been buying audio gear from some other website who did not have this iem in stock.
Thought of buying from Audiostore.
I spoke to Mr Pritam and finalised the deal. Personal interactions do add up to the textual.content you gather from the net. Delivery was exactly as promised.
My first impression of the iem is Spectacular sound reproduction!!!
Songs thatIheardliterallyfelt like being played in front of me.
Bass sufficiently good enough for every listener except bassheads. Of course bassheads would lose considerable amount of ther sonic capabilities.
Soundstage wide and imaging is excellent. Inspite of good bass every instrument is distinctly clear and precise.
Only request for Audiostore is to include other leading brands like Fatfreq, Fiio, Ibasso etc.
My honest review these are best and luxury looking IEMS and I love them and they fit in my ear perfectly for me and I love them
This IEM sound really good for everyday listening. The Bass has a nice punch,Vocals come through clear and the overall sound feels balanced and enjoyable.They’re comfortable to wear for long periods and block out a decent amount of outside noise.Easy to carry around as it’s comes with a pouch and Great for Music,Videos.Definitely worth it for the price, and specifically thanks for audiostore team.❤️❤️.
The bass in these stays present and hits quickly. An easy term to describe the feel is cinematic bass. And it get loud very fast recommend use Low gain with high volume or High gain with Low volume. Prefer your your choice.
After 10 days of use, I feel I made a great upgrade from the 7Hz Elua Ultra. The main differences are that the Elua has laid-back vocals and sub-bass rumbling, while the STA Hi-End surpasses those limitations with good imaging, zero distortion at high volumes, and cinematic punch in the sub-bass.
Here is the detail review with help of claude to differentiate the same batch of IEM just at "ONE POINT"
link : https://claude.ai/public/artifacts/c3f98fc2-1929-415d-bc4a-4833928662d5
looks good , Sound is balanced, you can listen music,watch movies and also good for gaming.Bass is good not that much punchy but does not muddy details . No distortion at Max volume .
At first use I have loved the sound and the fit of the iem so far the best budget iem I have ever used go for it guys value for money product.
The DAC has no hissing sound and the other shell is build of metal. great wire quality no heating issues as well. also the red light is menacing as hell. also case is included which is fine/cheap quality. also type a to c converter is also given in box.
This is a very comfortable IEM, I can wear them for hours without experiencing discomfort or ear fatigue. The shell are relatively small, very light and fits perfectly in my small ear. The eartips are also good and doesn't cause irritation in ear canal.
It is my first iem that i have purchased and it turned out to be the best decision ! I researched a lot before buying it as i am a bass lover. Finally bought KZ Duonic with switches c type. Every note is so clean and for every type of song it adjusts the sound. Delivery was before time and even the packaging was great! Thank you The Audio Store ❤️
After trying multiple ear tips, finally I’ve settled with Divinus Velvet ear tips along with Spinfit-W1. This is perfectly sealed for me and gives that great sounding with any of the IEMs I own. Recommended. Thanks audiostore
Its perfect no doubts there but the silver plated itself is high quality but wire built and the eartips are of low quality mic is clear and perfect.🔥👍
One of best Dac in upper mid range category, it has most powerful Sgm8262 amp along with Cs43131 successor dac. The Aura seamlessly connects with my iPhone 15 and my window Laptop. Sound quality omg what a mind boggling Sound I am getting through this with MoondropNice earphone. That's exceptional. Somehow it has connections issues with My oneplus nord 4 due to oxygenOS 15. May be it will sort out after oxygen OS updates.
ThanksAudiocular team .
I loved it , surprised totally. What a sound separation.
I was a bit sceptical about ordering it from The Audio Store as I order from Headphone Zone.
But great shopping experience with The Audio Store.
This is first time experienced IEM in ever I love this❤
Perfect fit with perfectly balanced soundscape for my personal liking and genres! Thanks a lot for audiostore!













