SKU: 32567282030

Fosi Audio IM4 10mm Dual-Cavity Dynamic Driver IEMs

Sale price$84.01 Regular price$93.34
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Ships within 48 hours · Estimated delivery Jul 18 - Jul 23

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Description

Fosi Audio IM4 10mm Dual-Cavity Dynamic Driver IEMsFeatures: >High Performance Dynamic Driver IEMs. >Dual Magnetic Dual Cavity Dynamic Driver. >High Purity Beryllium Plated PU Suspension Diaphragm. >High Strength Neodymium N52 Dual Magnets. >Dual Chamber Construction. >CNC Machined Aluminum Alloy Cavities. >Open Back Shell Design. >High Efficiency Acoustic Damping. >Two Sets of Swappable Nozzles. >Ergonomic Design for Comfortable Fit. >5N OFC Silver Plated Cable. Technical Information: >Impedance: 21.

Features:-

>High-Performance Dynamic Driver IEMs.

>Dual-Magnetic Dual-Cavity Dynamic Driver.

>High-Purity Beryllium-Plated PU Suspension Diaphragm.

>High-Strength Neodymium N52 Dual Magnets.

>Dual-Chamber Construction.

>CNC-Machined Aluminum Alloy Cavities.

>Open-Back Shell Design.

>High-Efficiency Acoustic Damping.

>Two Sets of Swappable Nozzles.

>Ergonomic Design for Comfortable Fit.

>5N OFC Silver-Plated Cable.

Technical Information:-

>Impedance: 21Ω.

>Frequency Response Range: 20Hz~20kHz.

>Sensitivity: 109dB.

>Connector Type: 2-pin 0.78mm.

>Termination Plug: 3.5mm Gold-Plated Plug.

>Weight: 7g(per earbud).

Fosi Audio, known primarily for its portable as well as desktop HiFi audio gear is here with its very first pair of in-ear monitors, introducing the Fosi Audio IM4. It’s a single dynamic driver IEM designed with a specially-developed beryllium-plated PU suspension diaphragm. The pair features a dual-magnetic, dual-cavity dynamic driver unit with high-power Neodymium N52 magnets that provide high-efficiency and low distortion in the output. Fosi has crafted the pair with high-precision 5-axis CNC machining process using 6063 series aluminum alloy material. The shells have an open-back architecture to further enhance the sound performance with a wide soundstage. With high-efficiency acoustic damping, premium dual-cavity structure, and professional tuning, the Fosi Audio IM4 promises an enchanting sound response, one that captivates its listeners every single time!!

High-Resolution Clarity with Premium Driver:-

Fosi Audio has equipped the IM4 with a high-performance dynamic driver unit. The pair houses a dual-cavity, dual-magnetic dynamic driver unit that adopts high-purity beryllium-plated dome and PU suspension diaphragm coil. It not only produces a rich sound but also provides enchanting performance with ultra-low THD+N characteristics. The driver is placed neatly in a dual-cavity structure specially optimized to achieve a pure high-fidelity sound with the IM4.

High-Strength Dual-magnetic Configuration:-

In order to produce a high-quality sound with the IM4, Fosi Audio has designed the pair with a strong dual-magnetic architecture that utilizes high-power Neodymium N52 magnets. This dual-magnetic structure produces a strong magnetic flux that ensures swift diaphragm movement. All this results in cleaner sound output with ultra-low THD+N distortion performance. It also provides high-efficiency design to the pair, it now has an output impedance of just 21Ω.

Long-Lasting Comfort, Ergonomic Design:-

Fosi Audio IM4 has got a solid build quality, the pair is crafted using high-precision 5-axis CNC machining process. It is made up of high-quality 6063 series aluminum alloy material. The pair is designed in an ergonomic shape to ensure solid comfort, we also have open-back design with grill vents available on the face panel area. With this open-back design, Fosi ensures the IM4 has a massive soundstage profile.

High-Purity Stock Cable, Solid Accessories:-

Fosi bundles the IM4 with a bunch of high-quality accessories. We have two sets of swappable tuning nozzles, one high-purity 5N OFC silver-plated stock cable, and nine-pairs of ear tips featuring three pairs each of Balanced Sound, Bass Sound, and Deep Bass Sound variants.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 32567282030

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Brenda
San Leandro, US
★★★★★ 5
would buy again
Size: Medium (6.8"W*4.4"D*2.2"H), Color: Beige
Love this jewelry case. perfect size for travel and at a good price
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Reviewed in the United States on May 21, 2026
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Michelle Lough
Lake Worth, US
★★★★★ 5
It’s just as described. I love it. Very pretty and lots of space.
Size: Medium (6.8"W*4.4"D*2.2"H), Color: Beige
The quality of it was great. It’s very pretty and easy to travel with. Love the removable eaaring holder. Gives enough room for everything
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Reviewed in the United States on April 27, 2026
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alessa
Pawtucket, US
★★★★★ 5
Great value, great product!
I use this as a home jewelry box - I don't wear a lot of jewelry, so it fits my needs perfectly. Its pretty lightweight and would be good for travels as well. The outside is leather-like and seems to be waterproof so far. I use the first layer for jewelery and second layer to store my hairclips and pins. I've had it for a few months and it seems to be great quality and durable! Definitely a good value as well because I've seen similar jewelry boxes sold at popular retail stores for over $30.
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Reviewed in the United States on January 21, 2026
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Marie
Birmingham, US
★★★★★ 5
Lovely Slate Gray Jewelry Box
I just received this Slate Gray jewelry box. It's really quite lovely and just the right size for my granddaughter's vanity. I'm really excited about giving it to her, for her 12th Birthday, to hold her better jewelry. It's so nice I'm going to order another one for my other Granddaughter's Birthday.
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Reviewed in the United States on December 5, 2025
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Cathy D.
Pawtucket, US
★★★★★ 5
Songmics Slate Gray Travel Jewelry Box
I purchased the slate gray Songmics jewelry box for travel purposes. We take long vacations and have an upcoming 20 day cruise. I wanted a jewelry box that was compact enough to put in my carry-on bag, but still had room to hold a months worth of jewelry, especially to keep my necklaces for tangling. When this arrived, I was pleasantly surprised and the packaging was great, shipped in a sturdy box. so no damage to the jewelry box. The color is a rich gray and the 2 tier box, while small, holds a lot of jewelry. I wanted to purchase the ink black but could not justify paying twice the price of the gray one just to get it in black. It is small enough that it will fit in most any hotel/ship safe so I won't be sitting out in the room anyway. It has a strong magnetic snap that keeps the box from opening while in transit. The one negative for me is that the pierced earring card is so thick that my earrings barely go through to have enough room on the back side the slip the backs on. I may separate the double thick card, realizing it will not look as nice but will be more functional. The bottom half of the box will hold bracelets up to 1 1/4" wide. There is enough room under the earrings card to place pendants, additional earrings, etc. The necklace holder is designed to hold 5 necklaces, but I added one more by going across the top, end to end, to prevent tangling. I also placed smaller hoop earrings in the ring holder which holds them securely. This box held 7 bracelets, 2 of which were wide, 5 rings, 9 necklaces (I placed 3 in the bottom of the box, and had room for 23 pair of earrings (some placed in the ring holder and in the bottom of the bo)! I would buy this again in a heartbeat.
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Reviewed in the United States on April 10, 2025

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