Description
Advanced Dual-Chamber Dynamic Driver
Tanchjim presents the 4U, a meticulously crafted pair of single dynamic driver in-ear monitors. Featuring Tanchjim’s self-developed DMT4 Dual-Chamber dynamic driver unit, this model utilizes an LCP composite diaphragm for exceptional sound reproduction, delivering clear and crisp audio.
Customizable Sound with Adjustable Circuit Filter
The 4U comes equipped with a 4-level adjustable circuit filter system, allowing users to tailor the bass response to their preferences. This simple yet effective mechanism makes the 4U versatile, letting you customize the sound signature as per your liking.
High-Quality Composite Diaphragm
The composite diaphragm in the 4U is designed using FEA simulation technology, ensuring a balance of rigidity and flexibility. This results in a robust lower-end response and dynamic performance, enhancing your overall listening experience.
Powerful Magnetic Design
The Tanchjim 4U features a high-power magnetic structure that ensures easy driveability and a wide dynamic range. This design minimizes distortion in the output signal, packing a powerful audio performance in a sleek and compact form factor.
Optimized for Comfort
The 4U is designed with an optimized front-cavity structure, ensuring a comfortable fit without pressure buildup in the ear canal. The well-crafted nozzle fits perfectly, providing a pleasant and fatigue-free listening experience.
Elegant and Thoughtful Design
Inspired by the Gray Rabbit, the 4U boasts a smooth, mirror-finish design with a U-shaped ear shell. Made using a zinc alloy frosting technique, it offers a premium in-hand feel and a visually appealing aesthetic, blending style with functionality.
Driver Configuration: Dual Chamber DMT-4 LCP Diaphragm Dynamic Driver with 4-level adjustable circuit filter system (bass filter)
Impedance: 32Ω
Sensitivity: 122 dB/Vrms
Frequency Response Range: 8Hz-48kHz
Total Harmonics Distortion: <0,05%@1kHz, 94dB
Cable: Silver-Plated Copper (SPC) cable with 0.78mm 2-PIN connectors
Plug Type: straight gold plated 3.5mm TRS
Microphone: No
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
Tanchjim is a Chinese audio brand that specializes in developing high-quality audio products. They offer a wide range of products including earphones, DAC & AMP, and In-ear monitors (IEMS). Tanchjim's products are known for their exceptional sound quality and attention to detail, making them a popular choice among audiophiles.

Description
Advanced Dual-Chamber Dynamic Driver
Tanchjim presents the 4U, a meticulously crafted pair of single dynamic driver in-ear monitors. Featuring Tanchjim’s self-developed DMT4 Dual-Chamber dynamic driver unit, this model utilizes an LCP composite diaphragm for exceptional sound reproduction, delivering clear and crisp audio.
Customizable Sound with Adjustable Circuit Filter
The 4U comes equipped with a 4-level adjustable circuit filter system, allowing users to tailor the bass response to their preferences. This simple yet effective mechanism makes the 4U versatile, letting you customize the sound signature as per your liking.
High-Quality Composite Diaphragm
The composite diaphragm in the 4U is designed using FEA simulation technology, ensuring a balance of rigidity and flexibility. This results in a robust lower-end response and dynamic performance, enhancing your overall listening experience.
Powerful Magnetic Design
The Tanchjim 4U features a high-power magnetic structure that ensures easy driveability and a wide dynamic range. This design minimizes distortion in the output signal, packing a powerful audio performance in a sleek and compact form factor.
Optimized for Comfort
The 4U is designed with an optimized front-cavity structure, ensuring a comfortable fit without pressure buildup in the ear canal. The well-crafted nozzle fits perfectly, providing a pleasant and fatigue-free listening experience.
Elegant and Thoughtful Design
Inspired by the Gray Rabbit, the 4U boasts a smooth, mirror-finish design with a U-shaped ear shell. Made using a zinc alloy frosting technique, it offers a premium in-hand feel and a visually appealing aesthetic, blending style with functionality.
Driver Configuration: Dual Chamber DMT-4 LCP Diaphragm Dynamic Driver with 4-level adjustable circuit filter system (bass filter)
Impedance: 32Ω
Sensitivity: 122 dB/Vrms
Frequency Response Range: 8Hz-48kHz
Total Harmonics Distortion: <0,05%@1kHz, 94dB
Cable: Silver-Plated Copper (SPC) cable with 0.78mm 2-PIN connectors
Plug Type: straight gold plated 3.5mm TRS
Microphone: No
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
Tanchjim is a Chinese audio brand that specializes in developing high-quality audio products. They offer a wide range of products including earphones, DAC & AMP, and In-ear monitors (IEMS). Tanchjim's products are known for their exceptional sound quality and attention to detail, making them a popular choice among audiophiles.
You may also like
OUR HONEST REVIEWS FROM THE CO-FOUNDERS & AUDIOPHILES
View allTRUSTED BY OVER 35K+ MUSIC ENTHUSIAST
Let customers speak for us
from 4775 reviews
Twilight from Soft Ears seems to me like a benchmark for single DD IEMs. The solid metal craftsmanship is commendable and when it comes to the sound, tonality, song signature and quality is presently benchmark for Single DD IEMs, may be rivalled by the Elder turii ti, which cost 3x of this.

I would really recommend these. I previously used KZ Castor, but these IEMs are a major upgrade. The sound division is really good. The only issues are low bass and high treble. If you want a more balanced or v shape, it is better to use an equaliser. I am using these with Fiio K1 and Audiocular X Tiandirenhe CS-PRO DACs. Both give a nice output.
I don't know if this is specific to Apple Music or IE 200, but when I push the music through an equaliser, I hear a crackling sound (only on hi-res, 24-bit/192 kHz). I will maybe test more on this and will update the review.
Finally, I would recommend it. These IEMs are worth the buck.

One of the best dac amp in budget category, it gives balance output that going well with my performer 8.

It's an interesting product. I like all the tip options in this pack. It's a good beginner pack to know how each tip material can affect the sound quality. All the tip material & quality are good. The silicone tips & foam tips in the pack are good, like those stock tips we get with IEM. But the surprising tips are the latex tip & the hybrid foam tip. Although the latex tip feels a little rubbery in feel & is a dust magnet, but it's very comfortable, provides a good seal and does enhance bass & treble response slightly. And for the hybrid tip, it's like best of both worlds. It gives the comfort of a silicone tip as well as provides the seal of a foam tip. I'm not a big fan of foam tip in general because of how they feel in ear & it's very difficult to put them in the ear, but these hybrid tips removed all those problems for me.

This is one of the best modular cables I have ever seen in this price range. Microphonic is there as the nylon type of material is used for wrapping the cable. But microphonic is very minimal compared to other similar cable I have used. But, once the music starts playing, the microphonic would be gone. connector quality is very premium, on both the 3.5 / 4.4 termination as well as at 2-pin connector end. I love how easy is to replace the 3.5 & 4.4 end. It's highly recommended if you are looking for any premium modular cable on budget. It's one of my favorite modular cables along with the Moondrop aria 2's stock modular cable.

Sounds exactly like the Salnotes Zero with a bit more bass. Has that same Harman curve with upper midrange bump and reduced lower mids making male vocals sound thin. Good resolution/detail and treble is perfectly done. Fit is good and I like that these are very light.

I have own onix aplha as a dac and this is definitely a upgrade in that regards

From Blon bl2 to BGVP DN2
The jump on dunu was really worth it
Almost every genre songs this IEM drive at another level of dept n separation
Only flaw i could pin point some jpop heavy electric or high pinch voice of singers was little intolerable but other than it skillet and every other genre it nail it..
Accesories are another level really feel like worth the price and best customer care...
Tried every format from flac mqa to dsd . movies or series or anime . this earphone r all in one.
Bass timing silent timing Treble timing is all so perfectly tune (tried on LGV50)

If you are looking for a pair of headphones that would be your end game on a budget, then look no further, Edition XS is the way to go.
I have been using these for about 2 years and finally I can say, these cans a robust, dynamic and neutral to slightly bright.
But it also packs a punchy bass and has a good soundstage.
All you need is a pair of Edition XS and further you can keep leveling up the sound quality by upgrading cables to balanced ones, getting good DAC/AMPS and also modding the cans with new filters and grill.

Pros:
1. Sound is excellent for the price. I would say moondrop chu level sound quality. It follows the harman target with a little but turned down treble. Many people find the harman target a bit harsh at the top end. But this solves the issue.
2. I never had connectivity issues. Pairing was easy. As soon as I bring out the earbuds from the case, the buds automatically connects to my android phone.
Cons
1. App could be better. Obviously the app and other functionality won't be at the level of other mainstream tws like bose, samsung etc.
2. The fit. As someone who mostly uses wired iems. The tws does not feel as comfortable as the iems. For my ears, it's only comfortable for an hour or so. After that, it gets really uncomfortable.

I have been through some online videos/reviews before this purchase. My shortlist were, Moondrop Chu II, KZ Castor Pro, Wan'er SG. Audio Store was kind enough to provide demo of these to compare. Also Mr. Pritam shared valuable inputs on differences between my selected comparisons.
Very happy with the Tangzu Wan'er SG's output, everytime I listen to some of my old fav bolly songs it generates smile. Guess using it day by day increasing some sort of details or maybe I am getting use to. Best for listening for longer duration without fatigue. Bassheads may find it irrelevant to their taste. Over-all best Balanced tune IEM I must say which has some spark and doesn't feel boaring.

In the realm of audiophile excellence, where sound transcends mere listening and becomes an immersive journey, the Roseselsa Distant Mountain headphones emerge as a beacon of luxury and precision. Marrying vintage aesthetics with cutting-edge technology, these headphones offer a sublime auditory experience that caters to the most discerning of listeners.
Design and Build Quality
The Distant Mountain captivates with its retro-inspired design, reminiscent of the golden age of personal audio. The headband, crafted from solid stainless steel and adorned with genuine lambskin, ensures both durability and unparalleled comfort. The coaxial CNC-machined body exudes a high-gloss finish, presenting an extraordinary high-end texture that is both versatile and fashionable. 
Sound Performance
At the heart of the Distant Mountain lies an innovative 40mm composite topological diaphragm. This redesigned dome and corrugated ring deliver crisp, transparent treble and profound, surging bass. Enhanced by neodymium super magnets and an acoustic structure dedicated to small-sized headsets, the Distant Mountain presents richer sound details and a more natural treble extension, immersing the listener in melodious music. 
Comfort and Usability
The sponge ear pads are designed with both softness and breathability in mind, ensuring prolonged listening sessions remain comfortable. The headband supports fine length adjustments, with clearly visible scales to alleviate any concerns about symmetry. The inclusion of a stranded-free 5N single crystal copper IEM cable, coupled with a detachable MMCX design, offers high playability and customization for the user. 
Conclusion
The Roseselsa Distant Mountain is a testament to superb build quality and exceptional sound performance. Its unique tuning direction, reminiscent of high-fidelity in-ear monitors, combined with its luxurious design, makes it a standout choice for audiophiles seeking both style and substance. While it may require amplification to truly shine and could benefit from thicker earpads for optimal comfort, its value proposition remains compelling. For those who appreciate a blend of retro aesthetics and modern audio excellence, the Distant Mountain is an unrivaled choice. 
In the grand symphony of high-fidelity audio equipment, the Roseselsa Distant Mountain plays its notes , offering a professional and luxurious listening experience that is both nostalgic and forward-thinking.

I was not expecting much but this IEM sounds really good. If feels like a much more expensive IEM. The convenience thanks to the USB-C connection is great. I am able to use it on my phone, ipad and laptop. Gonna get some and gift some friends. This is a great gifting IEM / starter IEM !!!
I love the compatibility and the bill quality of the AUDIOCULAR d07, it works well with my samsung m53, . I also liked that u provide a case along with it , 😉

Good Sound Quality. Bass Treble Mid Too God Under 2k Price, Lookwise Good & Ear Fit & Gaming Experience To Good. & clear Sound Sense.
Earphone Case Too Good 👍 I like it.
Fast Delivery in 2 day delivery In My Address.