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 in-ear monitor with a hybrid driver setup and a replaceable cable, choose YINYOO KZ ZSN Pro; if you need a non-in-ear, flat-style earphone with a single large dynamic driver and a wide, open presentation, choose LEAUDIO TRN Seahorse Classic.
• YINYOO KZ ZSN Pro — biggest strength: a 1BA + 1DD hybrid configuration (customized balanced armature plus a 10mm dynamic driver) in a zinc alloy and resin housing, with a removable, slot-protected cable that you can swap out.
• YINYOO KZ ZSN Pro — biggest trade-off: it's a true in-ear design with a deep-fit seal, so isolation and fit depend heavily on getting the tip right, and the sound leans full and bass-forward rather than strictly neutral.
• LEAUDIO TRN Seahorse Classic — biggest strength: a 14.2mm large dynamic driver with a PU + paper composite diaphragm and a diffused vent structure, tuned for balance, detail and a more open soundstage.
• LEAUDIO TRN Seahorse Classic — biggest trade-off: it's a non-in-ear, flat-style earphone, so it won't seal off outside noise the way an IEM does, and the cable is fixed rather than removable.
• Who each pick is for: go with the KZ ZSN Pro if you want a sealed in-ear monitor for gaming, stage work or monitoring; go with the Seahorse Classic if you want an open, flat-fit earphone for long listening sessions at a desk or on a commute.
The KZ ZSN Pro is built around a hybrid driver idea. A customized balanced armature handles the upper range while a 10mm dynamic driver carries the low end. The result, based on the spec sheet, is a sound signature described as balanced top to bottom with deep, solid bass, a clear midrange and clean highs. Frequency range is listed at 20 Hz to 40 kHz with 25 ohm impedance and 104 dB sensitivity — low enough impedance that a phone or a basic dongle should drive it without trouble.
The physical build is the other half of the story. The cover is zinc alloy, the cavity is imported resin, and there's an aluminum alloy vocal cavity, so it feels like a piece of gear rather than a disposable earbud. The angular shell with an ear hook is meant to sit locked in your ear, and the noise control is listed as sound isolation — that's the seal doing the work. The cable is removable with a slot-protection design that guards the pins from breakage, which matters if you're the type who snags cables or wants to swap in something else later.
This is the pick for gamers who want zero-latency wired audio, for stage and worship-team players who need to hear a mix clearly, and for anyone doing studio or monitoring work on a budget. It's also a sensible choice for video calls and everyday music. Skip it if you hate the feeling of something sealed deep in your ear canal, or if you specifically want an open, non-in-ear fit — that's simply not what this is.
The Seahorse Classic takes the opposite approach. Instead of sealing your ear canal, it's a non-in-ear, flat-style earphone that rests at the opening of the ear. The core of it is a 14.2mm dynamic driver — noticeably large, with a big vibration area that the spec sheet credits for a wide frequency response and a strong dynamic range. It's a single-driver design, so the tuning lives or dies on that one unit.
That unit uses a PU + paper composite diaphragm. Paper as the base layer is there for natural midrange character, while the PU layer adds elasticity, strength and fast response to the signal. A diffused vent structure controls airflow in and out of the cavity, which the manufacturer says reduces excess low-frequency buildup and avoids the airflow noise a single vent point can create — the goal being a more open soundstage in a small shell. The tuning is described as balance-and-detail focused: transparent mids, full and punchy lows, clear and soft highs.
Specs are 20 Hz to 20 kHz, 32 ohm impedance and 112 dB sensitivity, with a black PU diaphragm, a 1.2 m oxygen-free copper braided cable and a fixed connection. It ships with two pairs of foam tips and two pairs of silicone tips, and it's light — the headphone itself is listed at just 2.6 g. Buy it if you want an airy, non-in-ear listen for desk work, commuting or long sessions where you don't want pressure in your ears. Skip it if you need isolation from a noisy room, or if you want the flexibility of swapping cables.
• Best for noise isolation → YINYOO KZ ZSN Pro. Sound isolation is part of its design; the Seahorse Classic is non-in-ear and won't block a noisy room.
• Best for an open, non-in-ear fit → LEAUDIO TRN Seahorse Classic. Its flat-style placement avoids the sealed-in-canal feeling entirely.
• Best for a hybrid driver setup → YINYOO KZ ZSN Pro. One balanced armature plus one 10mm dynamic driver versus the Seahorse's single 14.2mm dynamic.
• Best for cable flexibility → YINYOO KZ ZSN Pro. The removable, slot-protected cable can be replaced; the Seahorse Classic's is fixed.
• Best for easy driving from a phone → LEAUDIO TRN Seahorse Classic. At 112 dB sensitivity and 32 ohm it's the more sensitive of the two on paper; the KZ is 104 dB at 25 ohm.
• Best for extended frequency range on paper → YINYOO KZ ZSN Pro. It's rated to 40 kHz versus 20 kHz for the Seahorse Classic.
• Best for gaming and stage monitoring → YINYOO KZ ZSN Pro. Wired, zero-latency and sealed, which is what those jobs need.
• Best for long, relaxed listening → LEAUDIO TRN Seahorse Classic. Lightweight, open and tuned for balance and detail rather than impact.
In my opinion, the YINYOO KZ ZSN Pro is the better buy for most people comparing these two. The hybrid driver setup, the sealed in-ear fit, the metal-and-resin build and the replaceable cable give you more ways to actually use it — gaming, monitoring, calls, everyday listening — and the swappable cable is real insurance against wear. I'd only steer you to the LEAUDIO TRN Seahorse Classic if you know you dislike in-ear pressure, want a more open and airy presentation, or plan to listen for hours at a desk. It's the more comfortable, more relaxed pick; the KZ is the more versatile one.
FAQ
The KZ ZSN Pro is an in-ear monitor: it sits sealed in your canal, which gives you sound isolation and stronger bass. The Seahorse Classic is non-in-ear and flat-fitting, resting at the ear opening, so it feels more open and lets more outside noise in. Choose based on whether you want a seal or an airy fit.
On paper the Seahorse Classic is slightly easier at 112 dB sensitivity and 32 ohm impedance, versus 104 dB and 25 ohm for the KZ ZSN Pro. In practice both are wired 3.5 mm earphones and neither is unusually demanding, so a phone or a small dongle should handle either one.
The KZ ZSN Pro has the edge here because its cable is removable with a slot-protection design that guards the pins — if the cable fails, you replace the cable, not the earphones. The Seahorse Classic uses a fixed oxygen-free copper braided cable, so a cable fault is a bigger problem.
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