This is the thirtieth product from the TANCHJIM brand to appear officially in the TDS Hearroom.
The KASIER is positioned as an iterative product to the KARA. When I heard it at the exhibition, I assumed it was yet another IEM in the thousand-yuan range. It was not until the price was announced that it turned out to cost under six hundred RMB—something I had not expected. In our view, the KASIER offers a transparent, airy quality similar to the FOLA, technical performance that is impressive even among thousand-yuan models, and the density advantages of a multi-driver setup. It even differs from TANCHJIM’s usual warm, thick-leaning approach at the thousand-yuan price point. Setting aside the surprise over its price, let us focus more on the IEM itself.
Package & Accessories
The KASIER’s packaging remains similar in size to that of thousand-yuan and even sub-thousand-yuan models such as the NORA, FOLA, and FISSION. In terms of design, it features a large side-profile illustration of Asano Tanch, accented with ice-blue details that echo the shape of the earphone’s faceplate. Inside the package, the accessories include six pairs of eartips and a carrying case. Unlike many previous TANCHJIM earphones, the KASIER does not offer options such as replaceable nozzles or interchangeable plugs—which is very much in the spirit of the KARA.
The carrying case is quite large and can hold the complete KASIER set along with a medium-sized dongle DAC. It is the same model included with the FORCE, ORIGIN, FOLA, SODA, and others. It continues TANCHJIM’s white colour scheme, with a structure similar to a watch storage case. The exterior is made of white PVC leather, the interior is flocked, and the magnetic closure of the lid is quite strong.
The eartip configuration consists of two types, six pairs in total: three pairs of T500A bass-enhancing eartips and three pairs of T500B treble-enhancing eartips. The T500 is a new series corresponding to the previous T-APB (which has actually been out for a while now). Its main features are an octagonal-like waveguide vibration-damping structure inside the nozzle and a design that allows it to rotate freely by a certain angle. The eartip dome material has also been changed to a low-hardness transparent silicone (which is also different from the liquid silicone we are familiar with).
Design, Fit & Acoustic Structure
KASIER comes in only one colourway: a high-transparency resin front cavity, and a frosted plastic rear cavity with an anodized aluminium faceplate and a transparent window. Its design approach is broadly consistent with the KARA—both are based on TANCHJIM’s signature right-angled triangular shell, with the faceplate split into two sections and a transparent window retained on the lower half. The KASIER, however, more closely resembles the FORCE in leaving the metal plate exposed on the surface. There are no issues with build quality, and the only decorative element is the light blue strip at the right-angle corner of the faceplate.
The shell volume is similar to that of the FORCE and KARA, since it has to accommodate PURE-series balanced armature drivers and a full-size dynamic driver. Compared with single-dynamic models such as the FISSION and FOLA, it still has a certain sense of fullness. However, thanks to TANCHJIM’s extensive experience in refining this triangular shell, its wearing adaptability is still quite good. The inner side of the shell has a slightly raised area designed for the concha cavity, while the cymba concha area is relatively flat. For most users with medium to large ears, the KASIER is still comfortable and lightweight to wear, with no rearward centre-of-gravity issue and not too much feeling of fullness; the fit just isn’t particularly snug. For those with smaller ears, because the shell is slightly longer vertically, there may be mild contact with the upper edge of the auricle, making the fit look somewhat floating. Given the shell thickness, side-lying wear is not recommended.
The nozzle is slightly thicker and has a not particularly pronounced retaining structure; both types of included eartips are relatively easy to install. The only vent on the surface of the KASIER’s shell is located beneath the connector socket, where you can clearly see the metal mesh filter. The dynamic driver has a separate duct leading to the rear cavity, and this vent enables a higher airflow.
Cable, Driver & Power Demand
TANCHJIM has paired the KASIER with a cable specified as high-purity silver-plated copper, with a 2×2 coaxial twist below the splitter and a slightly tighter braid. The cable is generally soft and thin, with no sense of bulk and only mild self-tangling. It comes standard with a fixed 4.4mm balanced plug, avoiding interface loss issues.
The detachable cable system is based on a 0.78mm 2-pin recessed socket design, with the socket recessed by about 2mm around its perimeter. It is well compatible with both flat-socket pins without additional housing and raised pins. Following the brand’s convention, the cable-end pins have been lengthened, providing a very tight fit. The cable end uses a raised-pin structure and can be used with most earphones that have flat sockets or recessed sockets without anti-misalignment grooves.
In terms of drivers, the KASIER uses a five-driver hybrid architecture consisting of one dynamic driver and four balanced armature drivers. For the low frequencies, it employs a 10mm DMT5 composite-diaphragm dual-magnet, dual-cavity dynamic driver, with an emphasis on long excursion and high magnetic flux. The midrange uses a set of PURE Mid composite balanced armature drivers, and the treble also uses a set of PURE Hi composite balanced armature drivers. Each of the three driver types has its own independent duct. Through hybrid physical and digital crossover, the KASIER achieves greater consistency and smoother integration than the KARA, with no noticeable sense of tonal discontinuity. At the same time, compared with the KARA and SODA, its tuning direction is also somewhat brighter.
The impedance is 16Ω and the sensitivity is 121dB/Vrms. Overall, the KASIER is still a relatively easy-to-drive IEM, and with the standard 4.4mm balanced plug, you can achieve very full driving with mid-range dongles such as the Space 2 and Space Pro. Even more affordable options like the Octave and Dawning 2 are no problem, and some entry-level 4.4mm dongles based on the 31993 solution can also drive it to good loudness. It is not particularly picky about source signature either.
Sound Description
Based on stock cable balanced drive and T500B treble-enhancing eartips, meeting the power requirements for proper driving.
Bass quantity is moderate, with a certain thickness, though fullness is not exaggerated. Elasticity is excellent, and sub-bass extension is among the best in its price class. Attack and decay are moderate, with a slight amount of lingering reverb retained. The sense of bloom in atmospheric rendering is minimal, though there is a certain richness reminiscent of the FORCE and ORIGIN. The KASIER’s bass is very solid, with impressive density and relatively deep extension. Instruments with fundamentals in the lower midrange exhibit a slight forward lean.
In the midrange, vocal positioning is slightly forward but not intimate, with a higher degree of refinement. It strikes a good balance between vocal texture and definition of note outlines; the outlines are clear and well-defined without being overemphasised, and thickness is moderate. There is no strong bias toward male or female vocals, and it is generally suited to voices that are more delicate and do not overly emphasise thickness or richness. Grain is somewhat polished, and smoothness is good—the midrange texture, similar to that of the SODA, has until now been uncommon at the KASIER’s price point. The tonality is largely neutral, with no obvious stylistic bias, though because it does not overly emphasise an engaging outline, it can take on a slight warmth with certain sources. Laryngeal positioning is slightly high, breath sounds are moderate in proportion but relatively rich. The forwardness of mouth sounds is kept under control, and sibilance is on the lower side, giving you excellent listenability without sacrificing transparency, and without unnatural artificial brightening.
In terms of instruments, most strike a balance between texture and definition of note outlines, with some string instruments softening their outlines slightly. Among string instruments, the violin, guitar, and viola offer a relatively rich amount of bowing and plucking detail for this price point, but without any obvious engaging emphasis. The cello has a solid body and occupies an appropriate proportion of the soundstage. Brass instruments have a moderate sense of presence, and instruments like trumpets that require brightness have a suitable brilliance. For an IEM whose midrange and treble are primarily handled by balanced armature drivers, the naturalness of woodwinds is quite good, though the sense of airiness is somewhat restrained. Instrumental harmonics are generally natural, but they do not diffuse everywhere. Among percussion, the kick drum has moderate presence, the snare decays at a moderate pace, and cymbals have appropriate brightness, with no obvious harshness or metallic character spilling over.
Treble brightness is moderate, leaning slightly bright, with a slight overall increase in thickness, but without any particularly prominent peaks, maintaining a good balance between transparency and listenability. Treble extension is quite good for this price point, though it does fall a little short of models like the SODA, with a slightly faster roll-off that is not premature.
The sense of space is moderate in scale, with some distance in both width and depth, and fairly clear boundaries. Compared with the open feel of the FORCE, the KASIER indeed feels more like the KARA—well-ordered and disciplined. Combined with an appropriate sense of “height,” the KASIER presents a space resembling an oblate spheroid. Separation between vocals and instruments is good, and overall coherence is not an issue. Resolution is excellent in the 500–800 RMB price bracket, without an obvious emphasis on “analyticalness.” Dynamics are moderate, and transient response is good.
Genre Versatility
The KASIER’s adaptability across most pop genres is consistent: Western pop, Mandarin pop, and J-Pop all fare well, delivering a clean yet not lacking presentation. Unless you are after an overly rich or heavily coloured flavour, the KASIER has no real issues. Its Anisong compatibility also benefits from its smooth upper midrange, performing quite well. In the broader rock and metal category, it handles alternative rock, pop rock, and some psychedelic rock well, while for metal it falls slightly short in terms of energy and prominent definition of note outlines. In the electronic category, apart from a few dance subgenres favoured by bassheads, it sounds good across the board. In the acoustic category, jazz comes across as fairly clean and gentle, and some small-scale instrumental pieces sound well-behaved, though large-scale works lose a bit of their sense of scale.
For new wired earphone products rated KT MARK IV and V, we provide two to three corresponding recommended tracks to help you perceive some of the earphone’s characteristics and strengths as quickly as possible. For the TANCHJIM KASIER Limited Edition, the TDS recommended track examples are the following two:
Pastel*Palettes – ワクワクmeetsトリップ
Coldplay – Midnight
Overall Impression
The biggest surprise the KASIER gave us is ultimately its price. Whether viewed as an iterative successor to the KARA or judged by its actual sound performance, it is clearly better than the usual standard in the 500–800 RMB bracket. Compared with the KARA and SODA, it sounds more “interesting,” as if it blends the strengths of those two models along with the sonic characteristics of the FOLA. It has both a solid, cohesive low end and a transparent, smooth upper midrange and treble—a combination that is difficult to achieve at this price, yet the KASIER manages it. As a result, for some time to come it will remain our top-tier recommendation in this price bracket, especially suited to listeners with relatively omnivorous tastes who do not expect a richly atmospheric or heavily outline-focused presentation.
KingTsui, TDS Studio.
Sept 2026
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Source: TDS Audio Experience
