Moondrop Aria 2 VS Tanchjim Fission

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Moondrop switches up the formula with Aria 2’s single dynamic “dome” driver, creating a presentation that feels set back from the head with surprising soundstage depth and precise positional cues. Instead of shoving detail forward, the tuning stays smooth, coherent, and non-fatiguing while still keeping vocals engaging and treble tidy. At $89, it becomes the new default pick in the sub-$100 bracket—easily preferred over other budget crowd-pleasers—thanks to that airy layering and “in-the-room” spacing that’s rare at this price.

Build and accessories are enthusiast-friendly: a weighty metal shell, recessed 2-pin, and a modular cable with 3.5/4.4 mm ends (the 4.4 plug fits tight, but locks solidly). The nozzle uses a replaceable acoustic filter and there’s a pressure-relief vent, though no spare filters are included and the tip selection is basic. Pairing scales well—from clean Class-A amps to punchy portables—without upsetting the balance; different sources simply shift flavor, not quality. Add the unexpectedly classy design and this becomes an easy top recommendation under $100 for listeners who value staging, ease, and refinement over brute-force brightness.

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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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Build and accessories hit above the price: a metal shell with a golden nozzle, medium-sized fit, solid lip for tips, and a tasteful faceplate flourish. The stock cable feels premium with clear L/R markings, a chin slider, and an easy quick-swap plug system that makes 3.5↔4.4 painless. The case is a standout—leatherette feel, smooth zipper—and the tips selection is practical. Street price hovers around $90, often dipping to the $60–70 range during sales, which makes the overall package compelling for the money.

Sonically, Aria 2 leans on clean upper-mids and a smooth treble with a lighter bass shelf; dynamics are modest, imaging is respectable, and resolution is good for the tier. It tracks very close to the original Aria’s tonality (with slightly less bass) and overlaps with Moondrop’s current lineup enough to reduce the appeal of some pricier siblings, while outclassing bright-tilted alternatives like Dunu’s Titan S2 on ease of listen. Think of it as a vocal-forward, safe single-DD that trades slam for clarity; a solid B/B- performer that’s easy to like, easier to recommend at sale pricing, and worth shortlisting if smooth, airy mids and a tidy, well-built kit are the priority.

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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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Aria 2 Red keeps the familiar Moondrop house tuning—balanced, clean with a gentle mid-bass lift—but shifts more mid-centric thanks to extra upper-mid energy. Vocals gain power and clarity, and the previous Aria 2’s fuzziness/soft timbre is tempered by trimming treble air, which in turn improves low-end tactility and preserves a good sense of space. Tip rolling isn’t picky: Softears Ultra Clear for smoother playback or Azla Sedna for more bite. It plays well at normal to mid-high volumes, though pushing it loud can get shouty around 1–4 kHz.

Against its siblings and peers, Red comes across as the most natural all-rounder in the Aria family—preferred over the OG and SE—which now feel outdated. Technicalities see a small bump versus Aria 2, yet remain a notch under sets like Defiant and EW300; sub-$100 planars (CLAR/F1 Pro/S12) still offer stronger raw performance. Versus EW300 (3.5), Red trades blows but the EW300 hits with better bass texture, slam, and treble detail, plus useful tuning nozzles and frequent sub-$60 pricing, making it the sharper value for many. For a similarly clean, airy tonality with more separation and sub-bass reach, Defiant is cited as the more compelling pick around the same bracket—QC caveats acknowledged on both sides.

Value is the sticking point. At $100 the Red feels slightly pricey amid a crowded field where Simgot’s EM6L (often ~$90) offers a smoother, more dynamic take, and options like A-Explorer, Yay500 LM, CCA Hydro, or plentiful $50 single-DDs provide distinctive flavors and strong technicals. The verdict is a half-recommendation: as a well-balanced, nicely built daily driver it works—especially on sale around $60–$70—but at full MSRP, enthusiasts seeking uniqueness or performance-per-dollar will likely find richer alternatives.

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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.

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Moondrop Aria sets a brutal value bar at $79, pairing elegant presentation with no-nonsense accessories: a tidy case, comfy fabric cable with zero microphonics, and serviceable tips. Build and box feel surprisingly premium—clean, simple, and just… right. As a package, it’s the kind of under-$100 IEM that forces every new budget set to prove itself against it first.

Sonically, Aria hits a neutral-with-bass-boost target that’s broadly Harman-leaning: a punchy mid-bass focus for thump and slam, modest but present sub-bass, and a clean handoff to the mids with no bleed. Vocals are the star—male voices carry a touch of warmth and weight, while female vocals have a bit more energy than sets like Starfield/KXXS, bringing them alive without turning shouty. Treble keeps things safe rather than spicy; not a pick for treble-heads, but still balanced enough that the overall presentation never dives into murk—just a smoother tilt up top.

Technical performance is where the “how is this $79?” reactions kick in. Detail retrieval is top-tier for the price, easily out-resolving many sub-$120 competitors, and the soundstage runs wider than typical budget fare. Imaging is competent rather than laser-etched (Starfield still images better), but the total package—tuning, clarity, width, and day-to-day listenability—feels unfair at this bracket. Verdict: a beginner’s best friend and the default recommendation under $100; if the budget is $50, it’s worth saving a little more for Aria.