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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4.9 ★★★★★
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Verified Purchase
Spacey
Carnegie, US
★★★★★ 5
Works for my aggressive chewer
Color: GT-2P
It is extremely hard material! My puppy is 6 month old and rips through everything and these absolutely have lasted longer than any plush toys, bully sticks etc. I honestly didn't think I would like them for her but she definitely aggressively choose on these all the time and they hold up so well. If you have a dog that aggressively choose these work for mine.
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Reviewed in the United States on June 6, 2026
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Verified Purchase
vyanney
West Palm Beach, US
★★★★★ 5
Tough, durable, and appealing
Color: GT-2P, Color: GT-2P
My Belgium loved her new toys…. Instantly started to destroy them … I can already tell these will last a while with how tough they are.
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Reviewed in the United States on June 10, 2026
D
Verified Purchase
DC
Carnegie, US
★★★★★ 5
Recommend
Color: GT-2P
Received these chew toys earlier today and my dog latched onto them quickly. He has been alternating playing with these since delivery.
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Reviewed in the United States on May 25, 2026
M
McNatt
Waukegan, US
★★★★★ 4
Got for larger pup, but younger/smaller pup likes them more.
Color: GT-2P, Color: GT-2P
I got these to try for our older pup that likes to chew on sticks and is always wanting to bring one inside, but I think he just prefers sticks instead. Our younger pup loves them though and steals them...runs off with one and chews on it...comes back and steals the other to take to her pile of toys for eventual destruction. That's just her nature. Ha ha! She is about 35 lbs. and, though these might be a little larger than I might have initially gotten for her, they are great and work just fine to keep her busy and entertained. I think the value for 2 super tough chew toys that are going to last more than a week is great. The texture of them is good for gnawing, or at least she thinks so. I would get them again but will not need to for awhile.
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Reviewed in the United States on June 8, 2026
T
Verified Purchase
Terri
Natrona Heights, US
★★★★★ 5
Yummy
Color: GT-2P
Dogs love them
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 3, 2026

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