Letshuoer S15 VS Yu9 Que

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The YU9 Que sports a premium, durable resin shell in pure black with a metallic-feeling faceplate and a comfortable design featuring an anti-tragus catch. While the build itself feels handsome and unique, the included cable is criticized as wimpy and unpleasant, with a strong suggestion to upgrade it. Accessories are deemed solid, including a nice selection of tips and a particularly praised case with a soft, luxurious interior.

Sonically, the YU9 Que earns immense praise for its exceptional tuning, described as clean, resolute, and non-fatiguing. It delivers strong, textured bass that avoids being overwhelming, coupled with extremely well-done upper mids. While not class-leading in technicalities like micro-detail or instrument separation, its tonal balance is considered sophisticated and reminiscent of far more expensive sets like the Annihilator, even surpassing the Monarch MKII in tuning preference. It's highlighted as a fantastic all-rounder with a smooth, agreeable signature suitable for long listening sessions.

Despite its modest single dynamic driver + 3BA configuration and $409 price point, the YU9 Que is declared a very special and unique IEM, worthy of the hype it received. The review concludes it's a price leader and a highly competent package from a small brand, offering outstanding value and a beautiful, well-executed design that makes it an easy recommendation for those seeking a smooth, non-fatiguing sound.

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Letshuoer S15 takes the planar recipe in a more natural, neutral direction, dialing back the upper-mids/treble glare that made earlier S12 variants feel “planar.” The result is a heavier note weight, smoother edges, and a timbre closer to a good dynamic driver—without the etched, floaty thinness common to many planars. Vocals sit forward with less Harman-style shout, bass carries satisfying sub-bass rumble with tight mid-bass separation thanks to planar speed, and overall fatigue is low. The trade-off is a presentation that’s more relaxed than hyped: treble sparkle and micro-detail aren’t spotlighted, and those craving sizzle may find it a touch polite.

Against its siblings, S15 is the cleanest, most neutral option—more open and balanced than the darker, ultra-chill S08, and more refined/grounded than older S12 iterations that pushed treble energy. The newer S12 2024 brings back liveliness and air while staying smoother than previous S12s, but S15 remains the pick for a reference-leaning planar with convincing timbre. It costs a bit more than S12 2024, yet what you’re paying for is timbre quality, note density, and a fatigue-free listen that still carries enough low-end punch. For listeners prioritizing naturalness over fireworks, S15 feels like the most mature expression of Letshuoer’s planar line.

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YU9 Que presents a balanced, almost neutral tuning with a tasteful touch of mid-bass for warmth and punch. Treble is clean and controlled—more clarity than “sizzle”—so detail comes through without harshness, while mids keep vocals natural rather than forward or thin. Technical performance sits in the “solid for the price” camp: separation and imaging are tidy, but not the kind of hyper-etched sparkle that chases wow factor.

In practice, it shines with slower pop, R&B, acoustic and vocal-centric tracks where its coherence and smoothness pay off; those seeking big sub-bass drama or ultra-aerated treble fireworks may find it a touch polite. Versus brighter, more contrasty sets, the Que trades spectacle for musicality and long-session comfort, making value hinge on whether a refined, low-fatigue signature is preferred over maximum excitement at the price point.

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Yu9 Que arrives with a surprisingly premium unboxing: a crush-resistant carrying case with plush padding, an IEM pouch, microfiber cloth, cable clip, and two ear-tip sets (standard silicone and more premium liquid silicone). A quirky 3D-printed nameplate with serial number and a faceplate etched in a topographic-map motif give it character. The shell is on the larger, wider side—comfortable for many, but small ears should test fit first. The stock cable is just okay (some memory, no chin slider), though it’s offered in 3.5 mm or 4.4 mm terminations.

Tonally, this is a neutral-reference set with a tasteful bass lift—clean impact without throwing off balance. Sub-bass has satisfying thump and texture, though bass-heads coming from sets like Kiwi Ears Punch may find it polite. The mids sit even and accurate—no “vocal magic,” yet clearly above average. Treble stretches well into the air with a touch of brightness that adds crispness and a slightly clinical edge, staying shy of fatiguing. Technical chops are the draw: a decently wide soundstage (roughly 3–4/5 by comparison), standout 3D imaging, and strong resolution/separation make it excellent for gaming—worthy of a two-controller nod—though ultimate detail still trails pricier kilobuck options.

Versus peers: Moondrop Dusk (DSP) is warmer with bass that hits a bit harder, while Yu9 Que is the more neutral, reference-leaning take. Allegiant Pilgrim offers smoother treble, but Yu9 Que counters with better bass grip, stage, and imaging. AFUL Performer 7 tilts mild V; choose it for extra mid-bass and forward treble, otherwise Yu9 Que wins on technicality. Mega 5 EST chases the meta target yet stumbles in bass/treble; NiceHCK Rockies refines that approach and might be the more exciting alternative if spending slightly more. Bottom line: the hype is justified—a superb all-rounder around $400 with only the cable begging for an upgrade. It’s a clear pick for neutral/reference fans, though those seeking more “fun” might look elsewhere; call it a pragmatic, two-star recommendation amid a crowded market and likely pre-order waits.

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Yu9’s Que lands as a “safer Annihilator”: a warmer, scaled-back take that pushes ample sub-bass while keeping the rest tastefully controlled. The low end feels liquidy and bouncy, underpinning an aggressive 1–3 kHz rise with a gentle 3–5 kHz taper, so vocals sit upfront and crisp yet remain remarkably smooth thanks to the extra low-end warmth. Treble is slightly scooped around 5–6 kHz and then climbs in small, well-placed peaks out to ~15–18 kHz, yielding excellent extension that feels on par with sets like Moondrop Variations in this range.

What makes it pop is the value proposition: at $400, the overall resolution, tonal balance, and staging read far pricier—more like the $700–800 bracket. With its engaging sub-bass lift, lucid mids, and airy yet controlled top end, Que comes off as a polished, crowd-friendly tuning that still excites detail chasers. If momentum holds, this looks like the next big thing around the $400 mark.