EPZ P50 VS Tanchjim Fission

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EPZ’s P50 feels like a breakout for the brand: a compact, medium-small shell with a vented faceplate that’s marketed as “open-back,” yet isolates like a typical IEM. The unboxing is tidy at this price—carry puck, a real microfiber cloth, and two sets of generic tips—while the modular cable (screw-lock swappable termination) is handy if a bit thin, stiff, and kink-prone; the 2-pin plug sits slightly proud of the socket and the “R” marking is visible on the outside. The long nozzle (~5.5 mm diameter) can push fit depth, so shorter tips (e.g., NF Audio-style) help; once set, stability and comfort are excellent. Overall build looks clean and modern, if a touch editorial compared with EPZ’s other shells.

Sonically, P50 embraces the current tilted diffuse-field “new meta” with a mostly neutral, natural presentation and a later-rising, sub-bass-centric lift that gives bounce rather than mid-bass thump. There’s a hint of extra presence around the 4–5 kHz region that adds macro-contrast—vocals pop with definition and separation is crisp—while upper treble stays safe: cymbals are clean but a bit light in weight. Bass is tight and incisive rather than slammy; micro-texture on vocals is good, though the set favors that big, “stagey” contrast over ultra-fine grain. It’s easily EPZ’s best tuning so far: clear, organized, and engaging without drifting from neutral-ish aims.

Against peers, Kiwi Ears K4 tracks a similar target but sounds lower-contrast and can blur on dense mixes; P50 hits harder on transients, images more cleanly, and keeps busy tracks sorted, while K4 offers a richer midrange with “frothier” treble. Versus the Binary Chopin, Chopin is warmer, fuller, and more mid-bass driven—more “analog” and atmospheric—with deeper perceived space but a bulkier fit; P50 is leaner, clearer, and the least bass-forward of the three. Verdict: a confident 4/5 for delivering a small, comfy fit and a clean, contrasty neutral that competes squarely around $200–$250. If the brief is “neutral with a bit of drama,” this is a strong pick—and a promising sign of where EPZ can go next.

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Tanchjim Fission comes in at $130 with a quirky onboard tuning dial that offers four bass positions—but every setting trends toward modest bass anyway, making the adjuster more novelty than necessity. The default “bass-max” profile presents that familiar single-DD contrastiness with a bit of dynamic punch, a slightly bright/forward tilt, and overall inoffensive treble. It never tips into harshness or sibilance, but the bass attack reads a touch pillowy and the whole presentation stops short of truly incisive.

In direct comparison, it’s more comfortable tonally than the spikier sets yet less engaging and less tight than the standouts, settling into a solid C-tier alongside other “fine but unremarkable” options. Resolution and imaging are serviceable, treble stays safe, and the included cable is surprisingly nice, but there’s not enough slam or bite to push it up the chart. Net result: a competent, easy-listen single-DD for those who value smoothness over excitement, with limited payoff from that bass dial.

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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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The EPZ P50 comes in hot as a new tribrid and a potential $200 neutral benchmark, trading sterile restraint for a more vocal-centric presentation. Versus the MEGA5EST, vocals sit a touch more forward—adding emotional weight and clarity—while the MEGA5EST still edges it on sheer smoothness and EST “air.” Compared to Meteor, the P50 fills in the lower mids, dials back 1–3 kHz glare, and opens the top end a bit; Meteor stays a hair softer up top. The catch is bass: the P50’s DD is competent but not a sub-bass shaker—expect clean rather than authoritative slam.

Against peers, the P50 sounds fuller and more natural than Supermix 4 (which is brighter and more “hi-fi” energetic), and it trades blows with Odyssey: Odyssey brings better bass texture and treble micro-detail, while the P50 delivers superior vocal clarity and a touch more air. It excels at mid-volume listening—Volume S needs more gain to bloom—and outclasses lighter, air-tilted sets like “K4” style tunings when male vocals or body are the priority. Accessory game is strong too: a nicer cable and a genuinely sturdy hard-leather case sweeten the deal. Not the most “unique” flavor and not for bassheads, but as a balanced, clean, vocal-forward option around $200, P50 is an easy recommendation for those chasing neutrality without the vanilla.

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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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The EPZ P50 is a five-driver open-back hybrid (1DD + 2BA + 2 micro-planars) that arrives with a solid accessory kit and a sensible price. The tuning is the highlight: a vocal-centric balance that avoids the over-energetic tilt of some Harman-leaning sets, while keeping a clean background and strong clarity. Sub-bass is trimmed for control, mid-bass adds body, and the result is natural male vocals and a presentation that feels both transparent and organized.

Upper mids rise earlier for familiar presence, and treble is extended by the micro-planars yet kept in check for wider appeal than brighter peers. Resolution is high for the class and the set can be revealing, sometimes asking for a touch more volume and occasionally sounding a bit unforgiving on hot masters. Bass is snappy rather than booming, trading rumble for speed and definition to keep the midrange clean.

Stage and imaging are standouts: spacious, precise, and helped by bass control and the open shell design. Compared with typical u-shaped ~$200 hybrids, this tuning prioritizes mids and coherence, showcasing a clear, extended top without brittleness. As a sub-$100 tribrid, the P50 delivers impressive value and feels like a sign of what is to come in this segment.

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Tanchjim Fission follows the brand's long-arc approach with a full bass arc and upper mids set just under Harman, yielding natural lower mids and balanced male/female vocal weight. A four-way switch plus three swappable, clearly labeled nozzles alter geometry subtly and nudge treble/texture, so cycling nozzles matters; in total there are up to twelve tuning combinations that stay coherent rather than gimmicky.

Compared with Origin, bass sits lower/back on the stage, freeing space for vocals and instruments; presentation is bigger and airier with better imaging and layering. Mids are more neutral in weight and closer to the open “Oxygen” style than the thicker, in-head feel of Origin, which helps EDM and mixed-genre playlists sound cleaner while avoiding mid-bass bloat.

Technical resolve is modest for the class: detail retrieval trails the stage/imaging strengths, and treble extension is good but not top-tier for a dynamic driver. Value is price-appropriate; pick the most resolving nozzle and consider lowering bass via the switch. The modular USB-C DSP connector and app add five sensible warm U-shaped presets—this brings real versatility—whereas a CS43198 “Luna”-type dongle tends to flatten depth, making the DSP path the preferable pairing.

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EPZ P50 comes as a tribrid at $185 with a surprisingly complete kit: a sturdy leatherette case, modular 3.5/4.4mm terminations, three silicone tip sets, and a cleaning cloth. The resin shells are semi-custom with aluminum faceplates; comfort is generally good but anatomy-dependent, and the stock cable—while well finished—runs on the stiff side. A standout twist is the factory customization option (~$225 total for the “Grindphones” style), which notably doesn’t alter the tuning in any meaningful way. The set is easy to drive, shows minimal change with impedance adapters (a touch warmer/more vocal-forward), and avoids pressure issues thanks to smart internal venting.

Sonically, tuning sits as a controlled, mild V: bass is just north of neutral with pleasing texture and impact, mids stay clean with an engaging female-vocal emphasis, and treble adds airy sparkle without turning tizzy—though insertion depth can trigger length-mode variability for some ears. Technical chops impress at the price: detail retrieval punches up, imaging is precise with good separation, and stage reads average but coherent. Against peers, P50 feels more resolving than Kiwi Ears K4 (trades bigger bass/sparkle for better mid clarity), brighter and more vocal-present than the neutral-leaning Ziigaat Lush, and echoes a Dunu Da Vinci vibe with less bass. Verdict: tremendous value and a terrific pick for vocal-centric libraries—highly recommended to audition first if treble sensitivity or fit quirks are a concern.

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The EPZ P50 arrives as a ~$200 tribrid with a slick presentation: FR graph on the box, a puck-style case, plenty of tips (oddly two identical sets), and a nice microfiber cloth. Build leans premium with a semi-open back and a faceplate that gives “arc reactor” vibes. The custom shell offers a secure fit for most, though very small ears—or anyone sensitive to an inner wing—may need caution. The modular cable (3.5/4.4 mm) is practical yet slightly stiff and retains some memory; isolation is typical of sealed IEMs despite the semi-open styling.

Sonically, the P50 goes for a warm-balanced tuning. Bass quality impresses: bouncy with deep sub-bass reach, prioritizing texture and control over sheer quantity (more thump is possible via an impedance adapter). Mids read natural with a touch of warmth—male vocals shine—while female vocals can feel a bit lean due to a more relaxed upper-mid energy. Treble is smooth, inoffensive, and “planar-clean” without planar timbre, with only a slight wish for more top-end extension.

Technical performance is the star. The micro planars pull out micro-detail unusually well for the price; imaging, separation, and overall resolution feel confidently executed, making guitars pop and busy mixes easy to parse. That clarity translates to gaming, where positional cues and crowded soundscapes (think battle royale chaos) remain intelligible—worthy of a two-controller gaming nod. Overall, the EPZ P50 is a solid contender at this price: balanced tuning with standout detail retrieval and imaging, tempered only by mids that play it a little safe. For listeners unbothered by a gentler upper-mid lift, it’s well worth the money—a two-star recommendation.

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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.