Moondrop S8 VS Tanchjim Fission

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Striking design meets smart ergonomics: a crystal-clear acrylic shell that looks glass-polished, with noticeably cleaner clarity than Blessing 2/Dusk. The fit is more contoured and effortless, thanks to slightly narrower nozzles; isolation is immense because it’s an unvented all-BA set, which also means some ear pressure for the uninitiated. Cable, case, and tips mirror the Blessing 2 bundle—serviceable if not premium.

Tuning sits in lean-neutral with a sub-bass lift: not a basshead set, but sub-bass presence is satisfying. As with most BA bass, it won’t move air like a DD; versus Blessing 2 Dusk the low end is considered weaker, yet it outclasses sets like the Dunu SA6 for punch and definition. The midrange delivers excellent detail and micro-contrast, tracking closely to Dusk’s slimmer mids rather than the warmer original B2. The showstopper is the treble—clean, airy, and refined with zero grit, pairing with wider-than-B2 staging (a “wraparound” feel toward ~180°) for standout imaging, separation, and layering. Among BA references, only benchmarks like 64 Audio U12t or Campfire Ara come to mind as peers for bass quality and overall finesse.

At $700, the value question hinges on priorities: dynamic-driver bass lovers may lean Monarch/Clairvoyance, but for those chasing mid/treble purity and effortless technicalities, S8 is special. Gorgeous build, secure fit, and a treble performance that feels best-in-class coalesce into an easy recommendation—ultimately earning a full 5/5 in this take.

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The Tanchjim Fission presents fantastic value right out of the box, largely thanks to its inclusion of a high-quality USB-C DAC cable with 3.5mm and 4.4mm terminations. The all-metal build feels premium, and the included cable is extremely silky and pleasant to use. A standout feature is the set of interchangeable nozzles that allow for sound tuning; the gold nozzle is the clear winner, providing the best balance, while others can make the bass less impactful. However, the fit can be a challenge for some as the shell lacks a pronounced lip, and the nozzles can be tricky to remove and replace.

Sonically, the Fission is extremely close to the more expensive and beloved Tanchjim Origin, offering a smooth, energetic sound with a tonality that is highly enjoyable. It provides a touch of warmth, pristine detail, and good air, making it a set that is easy to recommend and daily drive. When compared to other sets in its price range, it holds its own against competitors like the Dunu Kima (which has better fit and accessories) and the Kiwi Ears Quintet (which offers more bass), though the choice ultimately comes down to personal preference for tonality and the value placed on its tunable nature.

While it doesn't break the so-called "curse of the $150 IEM," the Fission is a strong contender and gets a full recommendation. Its few cons include a fit that may not work for all ears and a bass quantity that some may wish was greater. For those who value its specific sonic qualities, the excellent build, and the incredible package value with the included DAC cable, the Tanchjim Fission is a fantastic and competitive option that is very easy to enjoy.

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Moondrop S8 makes a strong first impression: a gorgeous build, clean shells, and a presentation that feels premium without pretending to be leather-clad luxury. The design keeps it simple—no tuning switches—and packs three different types of balanced armatures, hinting at a deliberate, all-BA execution. Moondrop’s track record is front of mind here: Kanas Pro, KXXS, and the A8 (the S8’s predecessor) stay on the “constant recs” list, while the Blessing line isn’t spared criticism despite the hype.

The included cable looks copper-like, is soft and supple, and uses a right-angle plug with Moondrop branding on the Y-split—though there’s no chin slider. Past Moondrop cable quirks get a nod, but this one appears solid on first inspection. Accessory fitment and finish are treated with care (no scratching those caps), and anticipation centers on the FR graph: if it doesn’t “graph like a disaster,” S8 is poised to be a winner. For now, it’s all about the music, the look, and a tuning that—if it tracks—could push this set straight into the recommendation zone.

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The Moondrop S8 mirrors the tonal balance of the Blessing 2 Dusk—similar bass level, natural mids, solid upper-mid presence, and extended treble—but distinguishes itself in execution. Bass is notably smoother; where Dusk can feel a bit forced/dry on bass-heavy tracks, S8 stays composed and fluid. Midrange carries a touch of classic BA timbre—notes sound lighter and a bit weightless versus Dusk’s more grounded “natural weight”—yet resolution and clarity remain excellent. Up top, energy is a step higher, giving female vocals a fuller, more effortless presence.

What sells the S8 is how cohesive and refined the whole package feels: transitions are seamless, detail retrieval is clean, and the tuning reads as a polished, more elegant take on the Dusk’s recipe. It’s effectively the Dusk, elevated—smoother bass, airier sparkle, and a more effortless overall presentation—making it a standout choice for listeners who prioritize clarity and treble openness without sacrificing balance. Among Moondrop’s lineup in this guide, S8 comes across as the most complete and the most compelling upgrade for a refined, reference-leaning sound.

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The Tanchjim Fission is an absolutely spectacular IEM that feels and performs far beyond its $129 price tag. It comes loaded with a ridiculous amount of customization, featuring three interchangeable nozzles (stainless steel, titanium, and brass) and a four-way tuning switch, creating a potential 12 different sound combinations. The entire package feels flagship-tier, boasting an excellent interchangeable cable system with 3.5mm, 4.4mm, and USB-C terminations, a waterproof bag, and even a keychain tool for adjustments.

After extensive testing, the definitive "cheat code" for the best sound is using the brass nozzles with the tuning switch set to Pop mode, which seemingly bypasses internal circuitry for a pure, direct sound. This configuration delivers exceptional clarity and a surprisingly wide soundstage, though they are not bass monsters. The fit is excellent, passing the "pinky test," and the build quality on everything from the IEMs themselves to the accessories is exceptional.

While not every combination of nozzles and switches is a winner, the sheer number of options ensures you can find a sound you love. For the price, the value is unmatched, feeling like a product that should cost $279. It comes as a full recommendation, offering a premium, highly tunable experience that is arguably one of the best deals in the IEM market, cementing Tanchjim's reputation for making no bad gear.

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The Tanchjim Fission presents a neutral, balanced, and clean sound signature that is also described as smooth and full. It offers a very natural and laid-back listening experience, making it a strong option for those seeking a safe, non-fatiguing tuning. The technical performance is solid for its price, with good detail retrieval and instrument separation, though it isn't the most dynamic or sparkly set available.

Tip selection is crucial, with recommendations for the Tri Clear or Final E tips to open up the sound, while the Spinfit CP155 can add a touch more bass. The included tuning switches are largely seen as a gimmick; only the middle silver setting is recommended, as the others introduce a significant sub-bass roll-off. The Fission excels with genres like rock, indie, acoustics, and classical at moderate volumes, but its lack of sub-bass rumble and extension makes it a weak choice for hip-hop, EDM, or rap.

Its greatest strength is its value proposition, as it is essentially a cheaper version of the Tanchjim Origin, sharing the same driver and sound profile for a lower cost. This makes competitors like the Moondrop Kato seem less relevant. However, when compared to other all-rounders like the Juzear 4U or Simgot EW300, the Fission faces stiff competition. The EW300, in particular, offers more bass, tuning variety, and similar technicalities for half the price, making the Fission a tougher sell unless its specific brand of smooth, neutral tonality is exactly what you're after.