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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-18 · 6 min read · Independent comparison
• Superlux HD661 — biggest strength: a closed, over-ear studio monitor with a 40mm neodymium dynamic driver, 68Ω impedance and a wide 10Hz–20,000Hz range, plus two cables and a pouch in the box. Great for noisy rooms and multi-person monitoring.
• Superlux HD661 — biggest trade-off: it's bigger and heavier (6.72 oz, plastic closed cups), and the 68Ω load asks more of weak phone outputs than a low-impedance in-ear will.
• TANCHJIM Nora Professional — biggest strength: in-ear monitors tuned for vocal and instrument monitoring, with a DMT5 dual-cavity dual-magnetic dynamic driver, 16Ω impedance, passive isolation up to 35dB, and a resin/steel/sapphire build meant for comfort over long sessions.
• TANCHJIM Nora Professional — biggest trade-off: they're in-ears, so fit and ear-canal seal decide everything, and there's only one pair in the box — no second cable or pouch extras.
• Pick the HD661 if you want a studio/broadcast over-ear you can hand to anyone in the room. Pick the Nora Professional if you want a lightweight in-ear for detailed vocal work and long live-stream or recording days.
The HD661 is a closed-back monitor headphone with a 40mm dynamic driver using a neodymium magnet. Superlux rates it at 102dB SPL (1mW) at 1kHz with a 68Ω impedance, and the frequency band runs from 10Hz to 20,000Hz. In plain terms: it's sensitive enough to get loud from modest gear, but the 68Ω figure means it rewards a decent headphone output rather than the weakest phone jack. It's a wired, over-ear design with plastic closed cups in black.
What makes it interesting for studio work is the combination of a sealed enclosure and what Superlux describes as a deep, balanced sound field — the kind of tuning engineers want when they need to trust what they're hearing. The airtight design is the practical selling point: closed cups block a fair amount of outside noise, so you can monitor in a loud control room, a live venue, or a broadcast booth without fighting the environment.
Who should buy it: anyone doing live monitoring, studio tracking, broadcast or general engineering work who wants an over-ear that one person can put on and another can take off. You also get real accessories in the box — a gold-plated 3.5mm-to-6.3mm adapter, both a 3.3ft and a 9.8ft straight cable, a cable clip, and a carrying pouch. That second long cable is genuinely useful for studio floors.
Who should skip it: if you want something that disappears into your ears for all-day listening, or you mostly listen from a weak headphone jack and don't want to think about impedance, an in-ear is the better shape. The HD661 is also a plastic-bodied over-ear, so it's a tool, not a jewelry piece.
The Nora Professional is a wired in-ear monitor built around TANCHJIM's DMT5 dynamic driver architecture — dual-cavity, dual-magnetic — with a waveguide faceplate designed to push high-frequency energy and resolution. Impedance is 16Ω and the frequency range is 20Hz–20,000Hz, so it's easy to drive from a phone, a laptop or an interface. The jack is 3.5mm or 4.4mm, and it's fully wired.
Where the Nora earns its "vocal/instrument enhanced" label is in the acoustic design. TANCHJIM describes an array-type diffusion structure in the front cavity that suppresses irregular sideways soundwave dispersion, plus an L-shaped internal path that turns the rear chamber into a Helmholtz resonance system to lift the 3–4.5kHz band. That's the region where vocal presence and sibilance live, so the intent is a natural, detailed mid-high without harshness. There's also FEA-based tuning to tame high-frequency peaks that small ear canals can create.
The build is the other half of the story. The cavity is high-transparency medical-grade resin, and the faceplate pairs 316L stainless steel with sapphire glass. TANCHJIM rates passive isolation at up to 35dB, which is more than most over-ears manage. Weight is listed at 0.21 kg for the package, and the whole pitch is lightweight, ergonomic, long-session comfort. There's a 12-month warranty.
Who should buy it: singers, streamers, podcasters and engineers who monitor vocals and instruments for hours and want detail on breath, sibilance and lip sounds, plus enough isolation to work in a noisy room. If you already like in-ear monitoring, this is squarely aimed at you.
Who should skip it: if you dislike things in your ears, or you want to share one pair with a bandmate mid-session, in-ears are the wrong format. Fit is personal, and no spec sheet can guarantee your seal.
• Best for noisy rooms and shared monitoring → Superlux HD661. Closed over-ear cups plus a long 9.8ft cable make it the practical choice for a live room or booth.
• Best for vocal and instrument detail → TANCHJIM Nora Professional. The 3–4.5kHz emphasis and diffusion cavity are engineered for exactly that.
• Best for long, all-day sessions → TANCHJIM Nora Professional. Lightweight in-ear build, resin cavity, ergonomic fit, up to 35dB passive isolation.
• Best for easy driving from weak sources → TANCHJIM Nora Professional. At 16Ω it's far easier to drive than a 68Ω over-ear.
• Best out-of-the-box kit → Superlux HD661. Two cables, gold-plated adapter, cable clip and carrying pouch are all included.
• Best for durability and premium materials → TANCHJIM Nora Professional. 316L stainless steel faceplate with sapphire glass over a medical-grade resin cavity.
• Best for genre-agnostic engineering work → Superlux HD661. The 10Hz–20,000Hz closed monitor tuning is a generalist's tool.
• If you're torn → pick by format. Over-ear for the room, in-ear for the voice. That one question usually settles it.
If I had to pick one for myself, I'd take the TANCHJIM Nora Professional — in my opinion it's the more specialized, more comfortable tool for the work it's designed for, and the 16Ω impedance plus 35dB isolation make it easy to live with. But I'd only say that if you're comfortable with in-ears. If your job is monitoring in a loud room and passing headphones between people, I'd recommend the Superlux HD661 instead, because closed over-ear cups and a long cable solve a problem in-ears can't. Format first, everything else second.
FAQ
Not necessarily. At 102dB sensitivity they get loud easily, but the 68Ω impedance means a weak phone jack may run out of headroom. A laptop, interface or dedicated amp will get more out of them than the weakest source.
That's the design goal. TANCHJIM built them lightweight and ergonomic with a medical-grade resin cavity, and they're rated for up to 35dB of passive isolation. How they feel after hours still depends on how well they fit your ears.
For vocal and live-stream work I'd point you to the TANCHJIM Nora Professional, because the tuning targets breath, sibilance and mid-high detail. If you also need to hear the room or share the headphones, the HD661 is the safer all-rounder. Check the current price on Amazon before deciding, since pricing moves and both are wired tools you'll keep for years.
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