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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, low-distortion hybrid in-ear monitor for critical listening, stage work, or gaming, choose HIFI WALKER A20PRO; if you need wireless, adaptive hybrid ANC earbuds with an open-ear hook fit and lossless codec support, choose EarFun Air Pro 4+.
• HIFI WALKER A20PRO — biggest strength: a 1DD + 1BA hybrid driver setup (11mm dynamic + 30095 balanced armature) in a wired 3.5mm package with low distortion (<5%) and strong channel balance.
• HIFI WALKER A20PRO — biggest trade-off: no Bluetooth, no mic, and only passive noise cancellation — it's a corded tool, not a do-everything daily earbud.
• EarFun Air Pro 4+ — biggest strength: adaptive hybrid ANC (EarFun QuietSmart 3.0) rated to cancel ambient noise up to 50dB, plus Bluetooth 6.0, Snapdragon Sound with aptX Lossless, LDAC, LC3 and LE Audio.
• EarFun Air Pro 4+ — biggest trade-off: the open-ear earhook design keeps you aware of your surroundings, which means it deliberately doesn't seal out the world the way a closed IEM does.
• Choose HIFI WALKER A20PRO if you want wired, accuracy-first monitoring with a secure over-ear fit.
• Choose EarFun Air Pro 4+ if you want wireless convenience, adaptive noise cancellation and codec flexibility.
The A20PRO is a hybrid IEM built around two driver types. An 11mm dynamic driver handles the low end — that's the "deep, punchy bass" part of its character — while a 30095 balanced armature takes care of vocals and treble. Splitting those jobs is the whole point of a hybrid: the dynamic driver gives you weight and impact, and the armature adds the fine detail and air on top without smearing it. HIFI WALKER specs distortion at under 5% and calls out channel balance specifically, which matters more than most shoppers realize. If the left and right channels don't track each other, imaging falls apart, and imaging is exactly what you're paying for in a monitor.
The wired connection tells you who this is for. A 3.5mm jack means zero pairing, zero codec negotiation, zero latency — audio goes in, sound comes out. For gaming, that's a real advantage: no Bluetooth delay between what you see and what you hear. For stage and studio use, a wired connection is the norm because it's predictable. The ergonomic ear hooks and lightweight build (25g total) are designed to keep the shell seated during long sessions, whether that's tracking, monitoring, or a marathon play session. The reinforced anti-tangle cable and zinc alloy + PC + silicone construction suggest it's meant to survive daily handling rather than live in a case on a shelf.
Skip it if you need wireless freedom, a built-in microphone for calls, or active noise cancellation. The A20PRO's noise control is passive — the seal of the tips does the work, not electronics. And if you want to hear your surroundings while you listen, this isn't the product for you. It's an in-ear monitor that goes in and stays in.
The Air Pro 4+ is a very different animal. It's a wireless Bluetooth 6.0 earbud with an open-ear earhook design, which means it sits in your ear but doesn't seal off the outside world. The double-curved surface and soft adjustable hooks are built for all-day wear without pressure, and the open design is intentional: you hear your music and everything around you at the same time. If you run near traffic, bike, or work in an office where people walk up to your desk, that awareness is the feature, not a compromise.
Inside, EarFun pairs a 10mm composite dynamic driver with a "FeatherBA" balanced armature — another hybrid system, but tuned here for wireless. The 11-degree angle alignment is aimed at reducing high-frequency attenuation, which is a fancy way of saying the treble stays crisp instead of getting swallowed by the housing geometry. On the codec side, the Qualcomm QCC3091 SoC supports Snapdragon Sound with aptX Lossless, plus LDAC, LC3 and LE Audio. That's an unusually broad codec menu, and it means the earbuds can scale up in quality with a compatible phone.
The headline feature is the noise cancellation. Adaptive hybrid ANC with QuietSmart 3.0 detects external noise and adjusts in real time, cancelling ambient sound up to 50dB. "Adaptive" is the key word — instead of one fixed level of cancellation, it shifts as your environment changes, which is what you want on a commute that moves from a quiet platform to a loud train. Controls are touch-based, and the frequency range spans 40Hz to 20kHz.
Skip it if you want maximum isolation for critical listening, if you prefer a wired connection for zero-latency gaming, or if you want a closed seal to lock in bass. The open-ear design trades isolation and sub-bass pressure for awareness and comfort.
Side-by-Side: Which Should You Choose?
• Best for noise cancellation → EarFun Air Pro 4+. Adaptive hybrid ANC up to 50dB versus passive sealing only on the A20PRO.
• Best for wired, zero-latency use → HIFI WALKER A20PRO. A 3.5mm jack means no Bluetooth delay, which matters for gaming and monitoring.
• Best for staying aware of your surroundings → EarFun Air Pro 4+. The open-ear earhook design is built to let outside sound in.
• Best for codec flexibility and wireless freedom → EarFun Air Pro 4+. aptX Lossless, LDAC, LC3 and LE Audio cover nearly every modern source.
• Best for calls and touch control → EarFun Air Pro 4+. Touch controls and Bluetooth 6.0; the A20PRO is a no-mic wired monitor.
• Best for long wear without pressure → EarFun Air Pro 4+. Soft adjustable hooks and an open fit are designed for all-day comfort.
• Best for a sealed, secure in-ear monitor fit → HIFI WALKER A20PRO. Ergonomic hooks plus a proper in-ear seal keep it locked in place.
In my opinion, these two barely compete — they solve different problems. If your priority is wireless convenience, adaptive hybrid ANC, codec headroom and staying aware of the world, I'd buy the EarFun Air Pro 4+. If your priority is a wired, low-distortion hybrid monitor that stays put through long studio, stage or gaming sessions, I'd buy the HIFI WALKER A20PRO. Pick the A20PRO for accuracy and zero latency; pick the Air Pro 4+ for freedom and noise cancellation. Check the current price on Amazon for whichever one matches your use case before you commit.
what is hybrid anc earbuds
It refers to earbuds that use two sets of microphones — typically one outside and one inside the ear — to handle noise cancellation. The outer mic samples ambient sound while the inner mic monitors what reaches your ear, and the system combines both to cancel noise more effectively. EarFun Air Pro 4+ uses adaptive hybrid ANC that adjusts in real time, cancelling ambient noise up to 50dB.
what is anc earbuds
ANC stands for Active Noise Cancellation: the earbuds use electronics and microphones to generate sound that reduces ambient noise, rather than relying on a physical seal alone. It's different from passive isolation, which is just the tip blocking your ear canal. The HIFI WALKER A20PRO relies on passive noise cancellation, while the EarFun Air Pro 4+ uses active hybrid ANC.
what are hybrid anc earbuds
They're earbuds whose active noise cancellation combines feedforward and feedback microphones for broader, more responsive noise reduction. Because the system senses noise from two points, it can adapt as your environment changes instead of applying one fixed level of cancellation. That's the approach behind EarFun's QuietSmart 3.0 adaptive hybrid ANC.
what are anc earbuds
They're wireless or wired earphones with built-in active noise cancellation, so you can reduce background sound without turning the volume up. ANC is most useful for commuting, flights and noisy offices. If you want ANC, the EarFun Air Pro 4+ is the fit here; if you prefer a wired monitor with passive isolation, the HIFI WALKER A20PRO is the alternative.
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