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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 wired, over-ear studio headphone with big 50mm drivers and a long single-sided cable for mixing, tracking or gaming at a desk, choose Superlux HD681B; if you need a compact in-ear monitor with a full-metal build, a detachable cable and swappable ear tips for listening on the move, choose BirdDance Z3.
• Superlux HD681B biggest strength: A semi-open, over-ear design built around 50mm dynamic drivers, a 10Hz–30kHz frequency range and 32Ω impedance — a spec sheet aimed squarely at monitoring and long studio or desk sessions.
• Superlux HD681B biggest trade-off: It's a wired, on-ear/over-ear headphone with a fixed 2.5m single-sided cable and no detachable connection, so it's tethered to your desk and not something you'll pocket.
• BirdDance Z3 biggest strength: A full-metal in-ear monitor with a 10mm + 6mm dual dynamic driver system, a detachable 2-pin cable and three styles of ear tips in S/M/L — flexible fit and easier long-term maintenance.
• BirdDance Z3 biggest trade-off: It's an in-ear design with passive noise isolation only, so it won't deliver the wide, open "in-hall" presentation a semi-open over-ear can — and it's clearly a different category of listening.
• Who Superlux HD681B is for: Anyone who wants a dedicated over-ear headphone for a desk, studio or gaming setup.
• Who BirdDance Z3 is for: Anyone who wants a durable, pocketable IEM with a replaceable cable and tunable fit.
The HD681B is a semi-open, over-ear headphone, and that single design choice shapes everything about it. The semi-open back is what gives it the wide soundstage and "in-hall" feel Superlux describes — the kind of presentation that makes a mix feel like it's happening around you rather than inside your skull. The 50mm dynamic drivers and 10Hz–30kHz range point to a deliberately balanced tuning: deep bass, clear highs, and enough resolution to pick apart individual instruments. For monitoring, tracking or critical listening, that's the point.
Build and ergonomics are aimed at sitting down and staying put. There's a self-adjusting headband, so you don't fiddle with sizing, and soft vinyl/leather-style earpads meant for long sessions without discomfort. At 277g it's not featherweight, but it's in the normal range for a full-size over-ear, and the self-adjusting band spreads that weight reasonably. The 2.5m (8.2 ft.) straight single-sided cable is generous — long enough to reach across a desk or from a couch to a TV — and it terminates in a screw-on gold-plated stereo mini plug with a 1/4-inch adapter included. The screw-on plug is a small but genuinely useful detail for anyone who's had a loose jack ruin a take.
So who should buy it? Anyone building a desk setup: home studio work, tracking vocals or instruments, streaming, or gaming where positional audio matters. The 32Ω impedance and 94.5dB sensitivity mean it's easy enough to drive from a phone, laptop or controller jack, though it'll sound its best from a proper interface or amp. It also ships with a protective pouch and a 1/4-inch adapter, so it's ready for a mixing desk out of the box.
Who should skip it? If you want something to wear on a commute, in a cafe, or at the gym, this isn't it. The semi-open design leaks sound both ways, so it won't isolate you from a noisy train and it will annoy the person next to you. And because the cable is fixed, you can't swap it if it fails or upgrade it later. This is a stay-at-home headphone.
The Z3 is a completely different animal: an in-ear monitor with a full-metal housing and a stainless steel faceplate. The construction story here is the headline — die-cast and CNC-machined alloy, which is a genuinely more premium approach than the plastic shells common at the entry level, and it should hold up better to being tossed in a bag. The detachable 2-pin cable is the other big one: if the cable dies, you replace the cable, not the earphones. That's a real longevity advantage over any fixed-cable design.
The audio side uses a custom dual dynamic driver system: a 10mm plus a 6mm driver with a PU+PEEK composite diaphragm, plus what the description calls an open acoustic secondary driver, tuned for vocal clarity and instrument separation. The claimed result is a wider soundstage and better positional awareness — which is why BirdDance markets it for musicians, gaming and movie watching as much as for music. In-ear monitors naturally isolate more than semi-open over-ears, so that extra separation matters when you're trying to place footsteps or pick a vocal out of a dense mix.
The fit and tuning flexibility is where the Z3 really differentiates itself. It ships with a full set of ear tips in multiple sizes, and three distinct styles that change the sound: Clear for enhanced mids and highs, Balanced for fuller bass and a smoother presentation, and BambooTune for greater detail, clarity and soundstage expansion. That's unusually generous — most in-ears give you one tip style in three sizes. It means you can nudge the tuning toward your taste without buying anything extra. There's also a Type-C variant with a built-in DAC chip mentioned in the materials, for wider compatibility and stronger driving power, though the model listed here is the 3.5mm, no-mic version.
Who should buy it? Anyone who wants an IEM that travels well, sounds good from a phone or laptop's 3.5mm jack, and can be maintained rather than thrown away. Musicians who need a stage or practice monitor, gamers who want positional cues, and listeners who like to fine-tune their fit and signature will all get value from the included tips and detachable cable. Who should skip it? If you want a wide, open, over-ear presentation for mixing at a desk, an IEM won't replicate that — in-ears put the music in your head, not around it. And if you specifically want a mic for calls, note this version doesn't have one.
• Best for studio and desk monitoring → Superlux HD681B. 50mm drivers, 32Ω impedance, a semi-open design and a 2.5m cable are all built for sitting at a workstation.
• Best for portability and commuting → BirdDance Z3. A full-metal in-ear with a detachable cable is the only one of the two you'd actually carry around.
• Best for cable longevity → BirdDance Z3. The 2-pin detachable cable can be replaced; the HD681B's cable is fixed to the housing.
• Best for fit customization → BirdDance Z3. Three ear-tip styles in S/M/L let you tune both comfort and sound.
• Best for a wide, open soundstage → Superlux HD681B. A semi-open over-ear naturally projects a wider, more spacious image than an in-ear.
• Best for passive isolation → BirdDance Z3. In-ear placement plus the tip seal blocks far more outside noise than a semi-open over-ear.
• Best for plug-and-play with a mixing desk → Superlux HD681B. It ships with a 1/4-inch adapter and a screw-on gold-plated plug, ready for pro gear.
• Best for gaming and movies on the go → BirdDance Z3. Tuned for vocal clarity and positional awareness in a package you can take anywhere.
In my opinion, the right pick comes down entirely to where you listen. If your listening happens at a desk — mixing, tracking, streaming or gaming — I'd buy the Superlux HD681B. The 50mm dynamic drivers, 10Hz–30kHz range and semi-open design are the formula for the wide, detailed presentation that makes studio work and immersive gaming enjoyable, and the long single-sided cable plus 1/4-inch adapter make it a natural fit for real audio gear. The fixed cable is the trade-off I'd accept for what the design delivers.
But if you want something that lives in your pocket, survives a backpack, and can be repaired instead of replaced, I'd buy the BirdDance Z3. The full-metal housing, detachable 2-pin cable and three sets of tuning ear tips give you flexibility the HD681B simply doesn't offer — and for an in-ear, that combination is hard to argue with. Check the current price on Amazon for both before you decide, since that's the one variable I can't weigh for you.
It depends on the setup. For gaming at a desk where you want a wide, open soundstage and positional cues, the HD681B's semi-open over-ear design is a strong fit. For gaming on the move, the Z3's in-ear isolation and vocal-forward tuning are more practical.
Correct. The Z3 uses a detachable 2-pin cable, so you can replace or upgrade it. The HD681B has a fixed 2.5m single-sided cable with a screw-on gold-plated plug, which is durable but not user-replaceable.
The BirdDance Z3. As an in-ear with a tip seal, it provides passive noise cancellation. The Superlux HD681B is semi-open by design, so it leaks sound in both directions and is best used in a quiet room.
Not this version. The listed Z3 model is the 3.5mm no-mic variant, so there's no built-in microphone. If you need a mic, you'd want a different model or a separate solution.
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