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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a closed-back monitor headphone tuned for studio and broadcast work, choose Superlux HD661; if you need a bass-forward, foldable over-ear with two detachable cables and an inline mic, choose OneOdio Over Ear Headphone.
• Superlux HD661 — biggest strength: a genuine enclosed (sealed) studio-monitor design with a 40mm neodymium driver, 68Ω impedance and a wide 10Hz–20kHz range, plus two straight cables, a cable clip and a pouch in the box.
• Superlux HD661 — biggest trade-off: it's the more specialised tool. Sound isolation is the point, so there's no inline mic, no coiled cable and no folding hinge for travel.
• OneOdio Over Ear Headphone — biggest strength: a 50mm dynamic driver pushing a bass-heavy tuning, a foldable lightweight build, and two detachable cables (a 9.8ft coiled 6.35mm and a 3.9ft 3.5mm with mic and an on/off button).
• OneOdio Over Ear Headphone — biggest trade-off: the frequency range starts at 20Hz rather than the HD661's 10Hz, and the tuning clearly favours bass and casual listening over flat, critical monitoring.
• Choose Superlux HD661 if you're recording, monitoring or broadcasting in a noisy room and want a sealed, neutral-ish reference sound.
• Choose OneOdio Over Ear Headphone if you're a DJ, a home listener or someone who wants one pair for a phone, a mixer and a TV, with a mic for calls.
The HD661 is built around one idea: keep the outside out. It's an enclosed (closed-back) over-ear headphone with plastic cups, and Superlux positions it for live monitoring, studio work and broadcast — the kind of jobs where you can't have the room bleeding into what you hear. That 40mm dynamic driver with a neodymium magnet, rated at 102dB SPL (1mW) @ 1kHz, is efficient enough to be driven by a modest headphone output, while the 68Ω impedance sits in a sensible middle ground: not so low that it misbehaves on weak sources, not so high that a laptop or interface struggles.
The spec that stands out most to me is the frequency band: 10Hz to 20,000Hz. Whether or not you can hear a 10Hz fundamental, that figure tells you the design is aiming for deep low-end extension and a balanced overall tone rather than a boosted smiley-face curve. Superlux describes it as high-resolution with balanced tones, which is exactly the language you want from a monitor — it's supposed to tell you what's actually in the mix, not flatter it.
Who should buy it: engineers, podcasters, streamers and musicians tracking or monitoring in rooms with background noise, and anyone who wants a sealed, wired, work-focused headphone. The accessory set backs that up — a 3.5mm-to-6.3mm gold-plated adapter, both a 3.3ft and a 9.8ft straight cable, a cable clip and a carrying pouch. That's the kit of someone who moves between a phone, an interface and a mixer.
Who should skip it: if you want an inline mic for calls, a coiled DJ cable, or a headphone that folds down small in a bag, the HD661 isn't that product. It's also not the pick if you specifically want a big, thick bass signature — the design goal here is balance, not boom.
The OneOdio is the opposite personality. Its headline is a 50mm dynamic driver paired with neodymium magnets, and OneOdio's own framing is unapologetically about bass: powerful low-end, clear vocals and crisp highs. A 50mm driver is a large diaphragm for a headphone, and in practice that size is usually chosen to move more air down low. Its frequency range is listed as 20Hz–20,000Hz — the conventional full-band figure, and a good match for a tuning that leans warm.
Comfort and portability are the second pillar. The ear cushions are soft and padded for isolation, the headband is adjustable and stretchable so you can set the angle, and the whole thing folds. Round over-ear cups plus a folding hinge mean it packs down far better than the HD661 does.
Then there's the cable situation, which is the most practical part of the design. You get two cables, both fully detachable: a 9.8ft coiled 6.35mm cable that reaches from a TV or stereo to your chair without a tangle, and a 3.9ft 3.5mm cable with a mic and an on/off button. Because both a 6.35mm and a 3.5mm plug are included, you can move between a mixer, an amp, a PC, a tablet or a phone without hunting for an adapter. OneOdio lists compatibility with anything that has a 3.5mm or 6.35mm jack.
Who should buy it: DJs, bedroom producers, gamers, commuters and general listeners who want one headphone that works with everything, has a mic for the odd call, and folds flat. Who should skip it: anyone who needs a sealed, neutral reference for critical mixing decisions. The tuning is described as bass-forward, the noise control is listed as None, and a coiled cable is a DJ convenience rather than a studio one.
• Best for critical monitoring and mixing → Superlux HD661. A sealed enclosure, 10Hz low-end extension and a balanced tuning are built for judging a mix, not enjoying it.
• Best for bass-heavy music and casual listening → OneOdio Over Ear Headphone. The 50mm driver and OneOdio's own bass-first description are the giveaway.
• Best for noisy rooms → Superlux HD661. The airtight design is specifically there to keep external noise out for live and broadcast use.
• Best for travel and storage → OneOdio Over Ear Headphone. Foldable, lightweight and round-cupped; the HD661 has no folding hinge in its spec sheet.
• Best for cable flexibility → OneOdio Over Ear Headphone. Two detachable cables — a 9.8ft coiled 6.35mm and a 3.9ft 3.5mm with mic and on/off button.
• Best for calls and voice chat → OneOdio Over Ear Headphone. The HD661 has no microphone at all.
• Best for plugging into pro gear → OneOdio Over Ear Headphone. It has both 3.5mm and 6.35mm jacks built into its cable set.
• Best out-of-the-box accessory kit for studio work → Superlux HD661. Two straight cables, a gold-plated 3.5mm-to-6.3mm adapter, a cable clip and a carrying pouch.
One more thing worth weighing: impedance and sensitivity. The HD661's 68Ω/102dB combination is a known quantity for studio gear, while the OneOdio sheet doesn't list impedance at all — so if you're pairing with a specific interface and care about matching, the Superlux numbers are the ones you can actually work with.
If I had to pick one, I'd buy the Superlux HD661 — for anyone whose headphones are a tool. In my opinion, the sealed enclosure, the 10Hz–20kHz range, the 68Ω/102dB specs and the straight-cable-plus-adapter kit make it the more honest monitoring headphone, and its design brief is exactly the job it's meant to do. That said, if your real use is music, gaming, DJ work and phone calls rather than mixing, I'd recommend the OneOdio Over Ear Headphone instead: the 50mm bass tuning, foldable body and two detachable cables simply fit everyday life better. Check the current price on Amazon before you commit, then buy for the job you actually have.
FAQ
Yes. The shorter 3.9ft 3.5mm cable includes a mic and an on/off button, so you can take calls or chat. The Superlux HD661 has no microphone in its spec sheet.
Yes. Its 9.8ft coiled cable uses a 6.35mm plug for mixers, amps and stereo gear, and the second cable uses a standard 3.5mm plug for phones, tablets and PCs. Both are detachable, so no adapter is needed.
The Superlux HD661. Its airtight, enclosed design is specifically intended for high-external-noise environments like live monitoring and broadcast. The OneOdio's padded cushions offer some isolation, but its listed noise control is None.
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