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Fosi Audio – IM4 Single DD Open Back In-Ear Monitor - 1

Fosi Audio – IM4 Single DD Open Back In-Ear Monitor

Fosi Audio

For Seasoned Audiophiles iem under 20000

    10mm N52 Dual-Magnet Driver For Superior Dynamics

    Beryllium-Plated Diaphragm Delivers Ultra-Low Distortion

    392-Strand 5N OFC Silver Cable Included In The Package

    Reference Grade Neutral Tuning & Excellent Technicalities

    Aerospace-Grade CNC Aluminum Shells Ensure Durability

    Swappable Nozzles & Multiple Eartips Increase Customizability

₹16699   ₹10399

₹ 10,399 ₹ 16,699 Save ₹ 6,300

Tax & Shipping Included

Tax IncludedShipping Included

Get a Free Case Worth ₹ 249

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Free Shipping on Prepaid Orders

Same day dispatch, if ordered before 2:00 PM. Info Order Placed before 2:00 PM will be shipped within 24 hrs. (Except Sunday and Holidays)

Cash on Delivery Available Info Cash on delivery applicable for order from ₹ 500 to 15000

Cash on Delivery Available Info Cash on delivery applicable for order from ₹ 500 to 15000

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Earn upto 5% of order value

With GST invoice, save up to 28% on business purchases

RETURN POLICY

10 Days Replacement Policy for Manufacturing defects. Info All products are covered by 10 Day Replacement Guarantee. This product is eligible for a free replacement, in case you receive a damaged, defective or different item. Please keep the product in its original condition with all accessories & packaging for a successful return. We may contact you to assess the damage or defect before issuing a replacement. Accessories like cables and eartips are not backed up the manufacturer's warranty.

Please note that physical damage cases need to be brought to our notice within 24 hours.

Simply Contact us through the chat window if you find any issues with your order.

WARRANTY

1 Year Manufacturer's Warranty

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Description

Fosi Audio IM4 delivers exceptional HiFi performance with a premium 10mm N52 dual-magnet dynamic driver. It also features a beryllium-coated PU diaphragm for ultra-low distortion, rapid transients, and precise detail across the full 20Hz-20kHz range. High sensitivity and low impedance make them effortlessly drivable from portable/desktop DACs, DAPs, and laptops without needing extra amplification.

The neutral reference tuning provides controlled sub-bass, forward natural mids, and smooth extended treble, creating a holographic wide soundstage with precise imaging and zero fatigue. User will not feel any soreness in their ears even after long listening sessions. Semi-open back CNC-machined 6063 aluminum shells ensure ergonomic comfort, acoustic resonance and durability.

A detachable high-end 4-core 392-strand 5N OFC silver-plated copper cable (0.78mm 2-pin) minimizes signal loss for pure fidelity. Customize your sound signature with swappable aluminum/brass nozzles and included eartips (3x balanced, 3x vocal) for bass-boost, vocal-forward, or analytical profiles.

N52 DUAL-MAGNET 10MM DRIVER

Fosi Audio IM4 features a premium 10mm N52 dual-magnet dynamic driver in innovative dual-cavity architecture for superior dynamics, tight bass control, and lightning-fast transients. High sensitivity paired with low impedance ensures effortless drive from portable DACs, DAPs and PC. This driver delivers expansive soundstage and pinpoint imaging for truly immersive HiFi listening across all genres.

ADVANCED BERYLLIUM DIAPHRAGM TECH

PU beryllium-coated diaphragm provides ultra-low distortion, exceptional rigidity and rapid response throughout 20Hz-20kHz range. This kind of diaphragm captures intricate micro-details in vocals, strings and percussion while preserving natural warmth and timbre. It minimizes resonances for crystal-clear transparency that stays fatigue-free even during long sessions. Audiophile-grade material helps this punch above its price class.

PREMIUM 5N OFC SILVER-PLATED CABLE

High-end 4-core 392-strand 5N OFC silver-plated copper cable uses 0.78mm 2-pin connectors with gold-plated 3.5mm plug for zero signal loss and maximum fidelity. Tangle-free sleeving and reinforced strain relief helps this cable withstand rigorous daily use. Modular design future-proofs for balanced 4.4mm upgrade. Clean power delivery also enhances driver performance.

REFERENCE- GRADE NEUTRAL TUNING

Fosi Audio has tuned IM4 Masterfully with a balanced sound signature. It delivers controlled sub-bass, forward natural mids, smooth extended treble without sibilance. Semi-open acoustic chamber creates holographic 3D staging and surgical instrument separation. This kind of tuning is versatile across genres, such as classical, rock, EDM, and vocals. This set is also ideal for critical monitoring, mixing, or pure enjoyment.

AEROSPACE-GRADE CNC ALUMINUM SHELLS

6063 aerospace-grade aluminum alloy shells are machined with precision for optimal acoustic resonance and durability. Ergonomic shape guarantees secure all-day fit without hot spots. The shells are ultra-lightweight and weigh only 7g per side. Even after weighing so less, they maintain robustness and are designed to last a lifetime.

CUSTOMIZABLE SOUND & ACCESSORIES

The IM4 comes equipped with a complete audiophile kit, including multiple balanced, vocal-focused eartips and even swappable nozzles. Mix-and-match for bass-boost, vocal-forward, or neutral profiles. Protective case organizes everything for portable audiophile sessions. This IEM truly offers unparalleled value as well as versatility.

Specifications

Brand Name
Fosi Audio
Model Name
IM4
Driver Unit
10mm N52 Dual-Magnet Dynamic
Diaphragm
PU Beryllium-Coated
Sensitivity
109dB ± 3dB
Impedance
21Ω ± 15%
Frequency Response
20Hz - 20kHz
Cable
392-strand 5N OFC Silver-Plated, 0.78mm 2-Pin to 3.5mm
Shell Material
6063 CNC Aluminum Alloy
Weight (per side)
7g
Nozzles
Swappable Aluminum/Brass
Connector
0.78mm 2-Pin
Plug
3.5mm Gold-Plated

Box Content

    What will you get
  • 1x Fosi Audio IM4 IEM
  • 1x 392-Strand 5N OFC Silver Cable
  • 1x Carry Case
  • 3x Balanced Eartips
  • 3x Vocal Eartips
  • Swappable Aluminum/Brass Nozzles

    Warranty

    1 YEAR WARRANTY

    Don't worry, Fosi Audio IM4 comes with a 1 Year warranty against manufacturing defects. We guarantee that every product on Concept Kart is genuine and backed by the Manufacturer's warranty.

    Read more about Concept Kart's warranty policy.

    Shipping Policy

    FREE SHIPPING ON ALL PREPAID ORDERS

    We usually ship orders on same day if ordered before 2 pm or within 24 hours if ordered later (except on holidays/sunday, where processing times may be higher) from one of our domestic warehouses based out of Delhi. It normally takes around 1 to 5 business days for delivery. We use premium service partners such as Blue dart, DTDC and Delivery for faster and reliable service. A tracking number will be provided upon shipment.

    In very rare cases when order is not received after 10 business days of shipment (extended by number of days when the govt. Restricts movement of goods due to factors such as coronavirus pandemic), please contact us and we will provide you a support.

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