How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a proper wired-to-wireless DAC/amp stack that can drive real over-ear headphones up to 300 Ohm with LDAC and aptX-HD on board, choose HAA FEE HA10-II; if you need true wireless earbuds with adaptive noise cancelling, six mics for calls and up to 40 hours of total playtime, choose EarFun Air Pro 4i.
• HAA FEE HA10-II — biggest strength: It is not a pair of headphones at all, it is a portable headphone amplifier with a dedicated DAC, LDAC/aptX-HD Bluetooth reception, a 3.5 mm input and a 3.5 mm output that can push 750 mW into 32 Ohm and 150 mW into 300 Ohm.
• HAA FEE HA10-II — biggest trade-off: You supply the headphones, you supply the source, and you carry a separate 105 g aluminium brick that runs 8–10 hours per charge. No ANC, no mic, no app.
• EarFun Air Pro 4i — biggest strength: A complete, self-contained listening system: adaptive hybrid ANC up to 50 dB, LDAC high-res audio off an 11 mm dynamic driver, 6 AI ENC mics, multipoint Bluetooth 5.4, IP55, up to 40 hours with the case.
• EarFun Air Pro 4i — biggest trade-off: It only drives itself. You cannot plug your favourite wired headphone into it, and with ANC on the numbers drop to 6.5 hours per charge and 27 hours with the case.
• Who each is for: HA10-II for the tinkerer with a good pair of wired cans who wants cleaner, louder, lossless-ish sound on the move; Air Pro 4i for the commuter who wants one thing in their pocket that does noise cancelling, calls and music without thinking about it.
The HA10-II is a niche device, and it is unapologetic about it. Inside you get a QCC5215 Bluetooth chip supporting LDAC and aptX-HD, an ES9038Q2M DAC that handles DSD, an OPA1612 op-amp and a TPA6120 headphone amp stage running on a ±9 V dual power supply. That is a desktop-grade signal chain shrunk into a 110 × 59 × 16 mm aluminium body weighing 105 g. The payoff is output: 750 mW into 32 Ohm and 150 mW into 300 Ohm, which is a genuinely serious amount of thrust for something this small. It is rated for headphones and earphones from 16 to 300 Ohm, so it will happily sit behind planars, high-impedance dynamics, or plain old efficient IEMs.
The numbers around the edges are respectable too — 0.007% distortion, 102 dB SNR, 8–10 hours of endurance from a 1700 mAh cell, and roughly 8–10 metres of Bluetooth range. One detail worth repeating, because it is easy to misunderstand: the Bluetooth link transmits data only, and the DAC decodes independently. That is why it can accept LDAC or aptX-HD wirelessly and still run the conversion through a proper ES9038Q2M rather than whatever is inside your phone. Inputs are Bluetooth and 3.5 mm; output is 3.5 mm.
Buy it if you already own wired headphones you like and you want them to sound louder, cleaner and more controlled from a phone, an MP3 player or even a car aux input. Buy it if you care about codecs and chips rather than feature lists, and if you are fine carrying a second small object alongside your phone. Skip it if you want earbuds, if you want active noise cancelling, if you take calls on the go, or if you want to control EQ from an app. It does exactly one job, and it does not pretend otherwise. Also note the "In Ear / In-ear" and "16 ohm" fields in the listing metadata — I would treat the 16–300 Ohm range in the main specs as the real guide, and this is a headphone amplifier first and foremost.
The Air Pro 4i is the opposite philosophy: one sealed box that solves everything. Adaptive hybrid ANC rated up to 50 dB that adjusts itself to your surroundings, an 11 mm custom dynamic driver with LDAC for high-resolution audio, and 3D surround sound for a wider stage. Six AI-enhanced ENC microphones handle voice pickup, which is the part most budget earbuds quietly fail at. Bluetooth 5.4 brings multipoint so you can be on a laptop call and still catch a phone call, plus Google Fast Pair for quick setup on Android.
Battery is the headline comfort: up to 9.5 hours per charge and 40 hours with the case in normal mode, dropping to 6.5 and 27 with ANC on. There is also a quick top-up claim of about 2 hours of play from a 5-minute charge, which matters more than total runtime on a short commute. IP55 water and dust resistance means sweat and light rain are not a problem. The EarFun App lets you adjust EQ, switch noise-cancelling modes and redefine the touch controls, and the brand recommends updating firmware for the best experience.
Buy it if you want earbuds that disappear into your routine — commuting, gym, calls, laptop, phone. Buy it if noise cancelling and clear calls matter more to you than driving a big pair of wired headphones. Skip it if your reference point is a proper wired setup through a dedicated DAC/amp, because no 11 mm bud can do what 750 mW into 300 Ohm does. Skip it if you want a wired 3.5 mm option, because there is no jack here at all. The 18-month warranty and the 48 g total weight tell you what kind of product this is: light, wearable, everyday.
• Best for driving wired headphones → HAA FEE HA10-II. 750 mW at 32 Ohm and 150 mW at 300 Ohm with a 16–300 Ohm compatibility window.
• Best for battery life → EarFun Air Pro 4i. 40 hours with the case in normal mode versus 8–10 hours for the HA10-II.
• Best for noise cancelling → EarFun Air Pro 4i. Adaptive hybrid ANC up to 50 dB; the HA10-II has no noise control at all.
• Best for calls → EarFun Air Pro 4i. Six AI ENC mics; the HA10-II has no microphone listed.
• Best for pure audio chain quality → HAA FEE HA10-II. ES9038Q2M DAC with DSD support, OPA1612 op-amp, TPA6120 amp, dual ±9 V supply, 0.007% distortion and 102 dB SNR.
• Best for portability and convenience → EarFun Air Pro 4i. 48 g total with the case, multipoint Bluetooth 5.4, Google Fast Pair, app control, wireless charging.
• Best for wired sources → HAA FEE HA10-II. 3.5 mm in, 3.5 mm out, plus Bluetooth if you want it — phone, MP3 player or car audio.
• Best for workouts and weather → EarFun Air Pro 4i. IP55 water and dust resistance; the HA10-II is a metal box you keep dry.
In my opinion these two barely compete — they solve different problems, and the right answer depends on what is already in your drawer. If you own a decent pair of wired headphones and want them to sound like they cost more than they did, I would buy the HAA FEE HA10-II. The dual ±9 V supply, the ES9038Q2M and that 750 mW/32 Ohm output figure are the reasons, and LDAC plus aptX-HD over Bluetooth means you are not forced to tether it. If you do not own wired headphones and just want one thing that handles noise, calls and music all day, I would buy the EarFun Air Pro 4i instead — it is the more complete product for ordinary life. Check the current price on Amazon before deciding, since both sit in very different budget brackets.
what is ldac headphones
LDAC is a Bluetooth audio codec that transmits at a much higher bitrate than standard SBC, which is why it is associated with high-resolution listening. In this comparison, both products support it: the HAA FEE HA10-II receives LDAC wirelessly and passes it to its ES9038Q2M DAC, while the EarFun Air Pro 4i uses LDAC with its 11 mm dynamic driver.
what is ldac support in headphones
It means the headphones or audio device can decode the LDAC codec rather than falling back to SBC or AAC. On the HAA FEE HA10-II, LDAC and aptX-HD arrive over Bluetooth 5.1 and the DAC decodes independently; on the EarFun Air Pro 4i, LDAC works alongside Bluetooth 5.4 and multipoint.
what is ldac codec in headphones
It is a codec, not a headphone type — a compression method for sending audio over Bluetooth at higher quality. The HA10-II lists LDAC, aptX-HD, aptX, SBC and AAC support, so it can accept almost anything you throw at it, while the Air Pro 4i centres its high-res claim on LDAC.
what is ldac sony headphones
LDAC was developed by Sony, which is why you often see the two mentioned together, but the codec is licensed to other brands as well. Both the HAA FEE HA10-II and the EarFun Air Pro 4i list LDAC support without being Sony products.
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