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 Aug 7 - Aug 12

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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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4.6 ★★★★★
Based on 10 reviews
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Product Reviews
K
Verified Purchase
Kindle Customer
Houston, US
★★★★★ 4
great concept, just one tiny annoyance...
Color: Black, Grey
i love that a sock that lets your toes be free is even a thing that exists. i love that this company was started by a young girl, now turned young businesswoman. i have pain in my big toes, so i can't wear close toed anything, but feet get stinky if you wear shoes/slippers all the time without socks. this is a great solution. the only thing i find slightly annoying (not enough to stop using these) is the seam on the bottom of your foot, near the base of the toes. it is a straight line, which is fine on the top of the foot, but i wish the bottom itself curved a bit, to follow the line of the toes. as it is, the seam lands right in the middle if the ball of my feet, so i can feel the seams everytime i take a step. i am constantly pulling the seam toward the toes, to try to keep from feeling it, but then my pinky toe gets caught and balled up on the inside. outside of that slight annoyance, they're comfortable and fit well.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 12, 2022
J
Verified Purchase
Jennifer F.
Fort Morgan, US
★★★★★ 5
Good fit
Color: Black and Gray Argyle
I wear a size 9 shoe and these fit well. They are a little snug, but not too tight.
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Reviewed in the United States on May 28, 2026
P
Verified Purchase
Polly Wayne
Bozeman, US
★★★★★ 5
A little expensive but really come in handy!
Color: Black, Grey
So far I am really happy with these socks. I broke my big toe and had to have my toenail removed and am wearing a post-op shoe/boot. I wanted to wear a sock underneath so that my foot wouldn't get too sweaty but my toe is still too tender for regular socks and cutting the toes off of regular socks doesn't work because they won't stay put. These work great- I actually pull them up over my little toes and just leave my first couple of toes exposed. I really like that you can wear these on either foot (unlike some open toed socks that have openings for the big toe and the rest of your toes so they are designated for left and right foot) since I'm only using them on my right foot.
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Reviewed in the United States on September 8, 2023
K
Verified Purchase
KP
Fort Morgan, US
★★★★★ 3
Excellent idea, could be better executed
I love the idea, but my problem with this product is that the bottom of the socks are made too short. The socks tend to slouch up when you wear them for awhile, so the entire ball of your foot will be exposed at some point. I would like to find a pair that cover the ball of the foot as well. But the socks are well made and attractive.
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Reviewed in the United States on May 28, 2019
J
Verified Purchase
Jasmine Takhtalian
Whiting, US
★★★★★ 5
Perfect Solution for Moisturizing Heels Without Full Socks
Color: Black, Grey
Excellent quality and incredibly soft! These toeless socks are perfect if you like to moisturize your heels but don’t want to wear full socks. They stay in place and keep the lotion where it needs to be—highly recommend
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2025

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