How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a wired planar in-ear that gets you a reference-style monitor sound for school without extra gear, choose Letshuoer S12; if you need a tribrid in-ear plus a dedicated USB-C DAC/amp so you can build a reference monitor setup around your laptop or tablet, choose Linsoul Kiwi Ears Halcyon.
• Letshuoer S12 — biggest strength: a single 14.8mm planar magnetic driver with 102dB/mW sensitivity and 16 ohm impedance, so it reaches usable listening levels from small portable devices and simple DAC/amp combos.
• Letshuoer S12 — biggest trade-off: it is a wired in-ear only, and the listing is built around the 3.5mm or 4.4mm plug option, so you have to match the connector to your source before buying.
• Linsoul Kiwi Ears Halcyon — biggest strength: a tribrid 1DD+3BA+MEMS driver architecture paired with the Allegro BAL Mini USB-C DAC/amp (PCM 32bit/384kHz, DSD128, dual balanced output) in one package.
• Linsoul Kiwi Ears Halcyon — biggest trade-off: the bundle is exactly two items, so you are committing to the included DAC/amp rather than choosing your own source chain.
• Who each is for: the S12 suits students who want a reference monitor in-ear they can plug into a phone, tablet or PC; the Halcyon bundle suits listeners who want a self-contained portable hi-res chain for a laptop-first desk setup.
The S12 is built around one idea: a big planar driver doing the work on its own. That 14.8mm planar magnetic driver is specified for high detail retrieval, potent bass, crisp mids and clear treble, and the 20Hz–30kHz frequency range covers everything a normal listener will throw at it. The number that matters most for a student is the 102dB/mW sensitivity with 16 ohm impedance — that combination means it does not demand a powerful amp to get to a sensible listening level. A phone, tablet, laptop or a small DAC/amp combo is enough.
Physically, this is a well-considered design for long sessions. The chassis is milled with a 5-axis process, so the seams are smooth and the outline is one continuous curve — no hard edges pressing into your ear. The shape is molded to sit in your concha, the matte finish resists ear wax, and there are two vent holes drilled into the sides of the housing to reduce pressure inside your ear. If you wear in-ears through a long study block or a full day of classes, that pressure relief matters more than any spec sheet number. The detachable 0.78mm dual-pin cable is woven from 128 strands of silver-plated monocrystalline copper — thick, soft, shielded and low impedance — and it ships with the 3.5mm or 4.4mm plug you select. You also get foam, standard and clear ear tips in S/M/L, a faux-leather case, a manual and a warranty card, plus a one-year warranty.
Linsoul Kiwi Ears Halcyon: Who It's For
The Halcyon is sold as a two-piece kit, and that is the whole point. Item one is the Halcyon IEM itself, a tribrid design combining one dynamic driver, three balanced armatures and MEMS technology — an architecture aimed at detailed imaging, balanced tuning and accurate positioning across the frequency range. Item two is the Kiwi Ears Allegro BAL Mini USB-C DAC/amp, which supports PCM 32bit/384kHz and DSD128 decoding with dual balanced output. Between them you get a resolution ceiling that a plain headphone jack will not reach.
That matters if your source is a laptop, tablet or phone with a USB-C port. Plug the Allegro in and the Halcyon gets a proper amplifier stage rather than whatever the built-in output offers. The listing frames it as a compact setup for audiophiles, musicians and mobile listeners, and the "new meta neutral" tuning description points at a balanced, uncolored presentation rather than a bass-heavy consumer curve. The IEM housing is described as aerospace-grade aluminum, which is a durability and rigidity story rather than a comfort claim.
Who should buy it: the listener who wants one purchase to cover both the earphone and the amplification, and who values a neutral-ish reference monitor signature for critical listening, practice or study where accurate positioning helps. It is also the tidier choice if you do not want to research DAC/amp pairings yourself. Who should skip it: if you already own a DAC/amp you like, you are paying for a second one; and if you want to swap sources freely with a 3.5mm single-ended plug, the bundle's USB-C DAC/amp orientation is the wrong shape for that workflow. Note also that the bundle contains exactly the two items — no extra tips, case or accessories are listed.
• Best for driving from a phone or tablet alone → Letshuoer S12. At 102dB/mW and 16 ohm it is designed to reach reference levels from small portable devices.
• Best for a laptop-first desk setup with a dedicated DAC/amp → Linsoul Kiwi Ears Halcyon. The Allegro BAL Mini handles PCM 32bit/384kHz and DSD128 with dual balanced output.
• Best for driver-technology variety → Linsoul Kiwi Ears Halcyon. A 1DD+3BA+MEMS tribrid versus the S12's single planar driver.
• Best for long listening sessions → Letshuoer S12. Two vent holes reduce in-ear pressure, the molded concha shape and matte finish favor all-day wear.
• Best for cable and tip flexibility out of the box → Letshuoer S12. Detachable 0.78mm dual-pin cable in 3.5mm or 4.4mm, plus foam, standard and clear tips in S/M/L.
• Best for a single clean purchase with nothing else to buy → Linsoul Kiwi Ears Halcyon. The bundle pairs the IEM and amp together by design.
• Best if you already own a DAC/amp → Letshuoer S12. You are not paying twice for amplification you already have.
• Best for critical, neutral-leaning monitoring → Linsoul Kiwi Ears Halcyon, based on its stated meta neutral tuning and imaging-focused tribrid architecture.
For school, I would buy the Letshuoer S12. My reasoning is simple: the 102dB/mW sensitivity and 16 ohm impedance mean it works from the devices students actually carry, the pressure-relief vents and molded shell make long study sessions more comfortable, and the included tip selection and detachable cable cover the basics without forcing a second purchase. The Halcyon bundle is genuinely appealing if you want a reference monitor chain with a real DAC/amp in one box — the 1DD+3BA+MEMS tribrid and the Allegro BAL Mini are a coherent pairing — but it locks you into that amplification choice. In my opinion, the S12 is the safer first monitor for a student, and the Halcyon is the better second purchase once you know what you want from your source chain. Whichever you pick, check the current price on Amazon before deciding.
what is studio monitor headphones
Studio monitor headphones are designed to reproduce audio as neutrally as possible rather than flattering it — the idea is accuracy over emphasis, so you hear the recording closer to how it was mixed. Both products here lean that direction: the S12 uses a 14.8mm planar driver tuned for detail retrieval, and the Halcyon uses a tribrid setup with a stated meta neutral signature.
what are reference studio headphones
Reference headphones are the monitoring-oriented subset of that idea — gear meant to serve as a neutral reference point for judging a mix. In this comparison, the S12's planar driver and 20Hz–30kHz range, and the Halcyon's dynamic-plus-balanced-armature-plus-MEMS architecture with imaging-focused tuning, are both aimed at that kind of detailed, positional listening.
what are studio monitor headphones
The term is used interchangeably with monitoring headphones: closed- or open-back headphones built to reveal detail and balance rather than to add bass or warmth. Neither product here is marketed as a full-size studio headphone — both are in-ear monitors, which is the same monitoring concept in a smaller, portable form.
can you connect headphones to monitor
If by "monitor" you mean a computer monitor or a studio monitor speaker, those outputs are not designed for headphones — you need a headphone jack, a USB-C DAC/amp, or an audio interface. That is exactly where the Halcyon bundle helps, since it includes a USB-C DAC/amp, while the S12 relies on the 3.5mm or 4.4mm plug you choose at purchase.
As an Amazon Associate I earn from qualifying purchases.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.
When you buy through links on this page, we may earn a commission from qualifying purchases at no extra cost to you.
Amazon and the Amazon logo are trademarks of Amazon or its affiliates. This site is an independent third-party review and is not affiliated with, endorsed by, or sponsored by Amazon or the product brands mentioned.
See also: KORABA Girls Headphones vs VOXii Auditory Feedback, Dongguan Acer Gadget vs OBEST Motorcycle comparison, Hendari Open Ear or Xmenha Mini: which is better, QCY T13 vs H HIFIHEAR 2: In Ear Earphones