If you want enclosed, wired headphones for monitoring or listening in noisy surroundings, choose Superlux HD661; if you need compact flat-head wired earbuds with a replaceable cable, choose LEAUDIO TRN Seahorse Pro. For college students, my pick is the HD661 when listening comfort and a more isolating design matter more than pocketable size.
Superlux HD661 vs LEAUDIO TRN Seahorse Pro at a Glance
• LEAUDIO TRN Seahorse Pro: Flat-head in-ear earbuds with a 14.2 mm dynamic driver and a replaceable 0.78 mm 2-pin cable. The trade-off is that the open, flat-head style does not offer the HD661’s enclosed design.
• Choose the HD661 if you want wired headphones for monitoring, studio work, or listening around external noise.
• Choose the Seahorse Pro if you want lightweight wired earbuds and the option to replace their cable.
The Superlux HD661 is an enclosed headphone built around a 40 mm dynamic driver. Its stated frequency range is 10 Hz to 20,000 Hz, and its 68-ohm impedance and 102 dB sensitivity describe its electrical and output characteristics. Those numbers help define the headphone, but they do not, by themselves, promise a particular sound signature or guarantee that every device will drive it equally well.
The enclosed design is the clearest practical distinction. Superlux describes the HD661 for live monitoring, studio use, and broadcast work, and says its airtight construction is suited to places with external noise. That makes it a sensible option for a student editing audio, monitoring a recording, or listening at a desk where a sealed headphone is more useful than a flat-head earbud. It comes with a one-meter cable and a three-meter cable, so the included cable options can suit both closer listening and a setup where the headphone jack is farther away. A 3.5 mm-to-6.3 mm conversion plug adds another connection option, and a carrying pouch is included.
The trade-off is size and a fixed wired connection: this is not the pick for someone who wants a tiny set of earbuds to carry in a pocket or move around with wire-free convenience. Skip the HD661 if you specifically want compact earbuds, Bluetooth listening, or a replaceable cable.
The LEAUDIO TRN Seahorse Pro takes a different approach: it is a wired, flat-head in-ear earphone with a 14.2 mm dynamic driver. Its listed frequency response is 20 Hz to 20 kHz, sensitivity is 110 dB, and impedance is 16 ohms. These figures provide useful technical context, but they do not establish how the earphones will sound to every listener or how comfortable their shape will feel in every ear.
How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-23 · 6 min read · Independent comparison
The flat-head design is also the key qualification. It is not the same enclosed fit as the HD661, so shoppers who specifically want the earcup-style seal described for the Superlux should look elsewhere. Skip the Seahorse Pro if you need an enclosed headphone for monitoring around external noise or want a longer cable option in the box.
• Best for an enclosed listening design → Superlux HD661. Its airtight construction is the feature to prioritize if you want the more sealed option.
• Best for studio, live-monitoring, or broadcast use → Superlux HD661. Those are the applications specifically described for this model.
• Best for choosing between a short and long included cable → Superlux HD661. It includes one-meter and three-meter cables.
• Best for a replaceable wired connection → LEAUDIO TRN Seahorse Pro. Its cable uses a 0.78 mm 2-pin connection.
• Best for a very lightweight earphone body → LEAUDIO TRN Seahorse Pro. The earphones are listed at about 3.7 grams, not including the separately listed cable weight.
• Best for a standard 3.5 mm wired connection → Either, subject to device compatibility. The HD661 includes a 3.5 mm cable and a 6.3 mm conversion plug; the Seahorse Pro has a 3.5 mm jack.
• Best for a student who wants something pocketable → LEAUDIO TRN Seahorse Pro. Its earbud format is the more compact option, though both products are wired.
• Best for a student who wants monitoring headphones and a carrying pouch → Superlux HD661. The pouch is included, along with two cable lengths.
Before choosing, think about where you will use the product most. A student who primarily listens at a desk, works with recordings, or needs an enclosed headphone has a clear reason to favor the HD661. Its two cable lengths also make it easier to match the wired setup to different distances from a device or audio connection. The trade-off is that it is a full-size headphone, not an earbud you can easily keep in a small pocket.
If carrying weight and replacing a cable matter more, the Seahorse Pro has the more compact format and a detachable 2-pin cable design. Its listed cable length is about 1.2 meters, so there is no second, longer cable in the provided specifications. Its flat-head construction is a distinct fit choice, not a substitute for the HD661’s enclosed style.
My Verdict
I would choose the Superlux HD661 for college students who need an enclosed wired headphone for monitoring, desk work, or listening around external noise. Its two cable lengths, conversion plug, and included pouch make it the more adaptable package for those uses.
I would choose the Seahorse Pro instead if compact flat-head earbuds and a replaceable cable are the priorities. But for my main college-student recommendation, the HD661’s enclosed design and monitoring-focused purpose are the more useful combination.
No. Both are described as wired products with a 3.5 mm connection. The HD661 also includes a conversion plug for a 6.3 mm connection.
The HD661 is the more suitable choice based on the stated design: it is enclosed, and its description highlights an airtight construction for areas with external noise. The Seahorse Pro is a flat-head earphone, not the enclosed headphone design described for the HD661.
The Seahorse Pro has a replaceable cable with a 0.78 mm 2-pin connection. The HD661 includes two cable lengths, but its specifications do not describe its cable as replaceable.
The product information does not specify a voice-assistant feature for either model. The Seahorse Pro is the earbud-style option, but shoppers looking for voice-assistant controls should confirm that feature before choosing; neither model’s listed details establish it.
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