We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-23 · 7 min read · Independent comparison
If you want a metal-shell, over-ear wired IEM with a detachable silver-plated cable and a lighter 22 ohm load that plays nicely with phones and consoles, choose CVJ Vivian IEM; if you need higher sensitivity and a mic-equipped Type-C variant with an LCP diaphragm and a liquid metal cavity, choose syeindunce TRN Dolphin In-Ear.
• CVJ Vivian IEM — biggest strength: A 10mm composite-resin dynamic driver with dual-magnet, dual-cavity tech, plus imported acoustic filtering sponge and tuning mesh for a clean vocal and a full, non-muddy low end.
• CVJ Vivian IEM — biggest trade-off: At 95 dB sensitivity and 22 ohm impedance it needs a bit more volume from weaker sources than the Dolphin, and the listed version has no mic.
• syeindunce TRN Dolphin In-Ear — biggest strength: A second-generation 10mm dual-magnetic driver with an LCP diaphragm and a liquid metal acoustic chamber, rated 106 dB / 32 ohm, and it ships in a Type-C with-mic version.
• syeindunce TRN Dolphin In-Ear — biggest trade-off: The higher 32 ohm impedance and the Type-C connection mean you should confirm the plug matches your device before buying.
• Who each pick is for: Pick the CVJ Vivian if you want a metal, anime-styled over-ear IEM for gaming, singing and general listening off a 3.5mm jack. Pick the TRN Dolphin if you want an easy-to-drive, mic-ready IEM with an LCP diaphragm for calls, music and studio-style monitoring.
The CVJ Vivian is built around a single 10mm dynamic driver using a composite resin diaphragm with dual-magnet, dual-cavity technology. In plain terms, that's a design aimed at low distortion and a balanced signature — smooth vocals, tight bass, rich mids and highs that stay clear rather than sharp. CVJ also adds an imported acoustic filtering sponge and a tuning mesh, which is the kind of detail that usually shows up in the upper midrange and treble, where a bad tuning makes voices sound thin or sibilant. The stated frequency range is 20 Hz to 20,000 Hz, sensitivity is 95 dB and impedance is 22 ohm.
The shell is metal, finished with a metal oxidation process and 3D laser engraving plus embossing, and the theme is listed as Anime — so this is a pair you're meant to enjoy looking at, not just listening to. The cable is detachable: a 1.25m silver-plated cable with 0.78mm 2-pin gold-plated connectors, which minimizes signal loss and lets you swap or upgrade later. You get three sizes of silicone tips (S/M/L), an over-ear cable routing that stays put during movement, and passive noise isolation from the seal. It terminates in a standard 3.5mm jack, so it plugs straight into smartphones, laptops, tablets, desktops, MP3 players and consoles like PS5, PS4 and Switch.
Buy it if you want one wired IEM for gaming, singing practice and everyday music, and you like the idea of a metal, personalized-looking shell with a cable you can replace. Skip it if you need a built-in mic for calls — the listed style is explicitly no-mic — or if you're plugging into a USB-C-only phone without an adapter.
The TRN Dolphin takes a different route to the same 10mm format. It uses a second-generation 10mm dynamic driver with a dual magnetic circuit, which the spec sheet ties to stronger bass, better energy conversion and a more dynamic presentation. The diaphragm is LCP — liquid crystal polymer — chosen for rigidity and low weight, which is what helps it reproduce fine detail and react quickly to transients. Around that sits a solid liquid metal acoustic chamber, included specifically to cut unwanted vibration and internal resonance so the sound stays clean and natural.
The tuning is described as balanced across bass, mids and treble, which makes it a generalist rather than a one-genre specialist. The numbers back up the "easy to drive" angle: 106 dB sensitivity and 32 ohm impedance, against 95 dB and 22 ohm on the Vivian. Higher sensitivity means more output for the same input, so the Dolphin tends to reach a usable volume more readily on a phone or a laptop headphone jack — handy for studio work, gaming and long listening sessions.
The cable is detachable with the same 0.78mm 2-pin standard, and the ergonomic ear-hook shape is designed to stay comfortable over extended wear. The listed color/variant is Type-C with a mic, and the box includes the cable, ear cushions, eartips, a protective case and a user manual. Noise control is listed as sound isolation.
Side-by-Side: Which Should You Choose?
• Best for gaming and console use → CVJ Vivian IEM. Explicit 3.5mm compatibility with PS5, PS4 and Switch, plus an over-ear cable that stays secure during movement.
• Best for calls and voice chat → syeindunce TRN Dolphin In-Ear. The listed version includes a mic; the Vivian's listed style is no-mic.
• Best for easy volume on weak sources → syeindunce TRN Dolphin In-Ear. 106 dB sensitivity versus 95 dB means it reaches usable loudness with less power.
• Best for cable upgrades and repairs → a tie. Both use a detachable 0.78mm 2-pin cable, so either can be re-cabled or replaced.
• Best for a metal, personalized look → CVJ Vivian IEM. Metal enclosure, metal oxidation finish, 3D laser engraving and an anime theme.
• Best for detail and transient speed on paper → syeindunce TRN Dolphin In-Ear. The LCP diaphragm is the spec aimed squarely at fine detail and fast response.
• Best for resonance control → syeindunce TRN Dolphin In-Ear. The liquid metal acoustic chamber exists to minimize internal vibration.
• Best for vocal smoothness and a non-muddy low end → CVJ Vivian IEM. The imported filtering sponge and tuning mesh target exactly that.
• Best for USB-C-only devices → syeindunce TRN Dolphin In-Ear. It's offered in a Type-C variant; the Vivian is 3.5mm only.
If I had to pick one for myself, I'd take the syeindunce TRN Dolphin In-Ear. In my opinion the 106 dB sensitivity and 32 ohm impedance make it the more forgiving daily driver on phones and laptops, the LCP diaphragm and liquid metal chamber are the more interesting acoustic package, and the mic plus Type-C option covers calls and modern devices in one go. I'd choose the CVJ Vivian instead if gaming on a console and a detachable silver-plated cable in a metal, anime-styled shell matter more to me than a mic. Either way, check the current price on Amazon before deciding, since value swings with whatever deal is live.
what is 10mm driver earbuds
A 10mm driver is the diameter of the dynamic speaker inside the earbud — here, the moving driver that converts the electrical signal into sound. Both the CVJ Vivian and the TRN Dolphin use a 10mm dynamic driver, but they differ in the diaphragm material: composite resin on the Vivian, LCP on the Dolphin.
is 10mm driver good for earbuds
Yes — 10mm is a common, well-rounded size for in-ear monitors because it can move enough air for solid bass while still fitting comfortably in the ear. Both products here build their whole sound around a 10mm driver, and each adds its own tuning and chamber design to shape the result.
is 6mm driver good for earbuds
A 6mm driver is smaller and generally moves less air, so it tends to suit treble-focused or compact designs rather than deep bass. Neither the CVJ Vivian nor the TRN Dolphin uses a 6mm driver — both are 10mm, so this isn't a deciding factor between the two.
Only the syeindunce TRN Dolphin In-Ear is listed with a mic; the CVJ Vivian IEM is offered as a no-mic version. If you take calls or use in-game voice chat, the Dolphin covers it out of the box, while the Vivian is better treated as a pure listening and gaming-audio pair.
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See also: TINHIFI C1 vs HIFIXAUDIO KZ Duet: 10mm Driver Earbuds, Kinboofi Klean vs syeindunce Tangzu Xiao Qiao: Dj Monitor, HYS 2.5mm vs VistaRise 2pcs: Ear Pieces