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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-27 · 7 min read · Independent comparison
• EarFun Air Pro 4+ biggest strength: a hybrid dual-driver design (10mm dynamic + balanced armature), Qualcomm QCC3091 with Snapdragon Sound and aptX Lossless, plus codec support for LDAC, LC3 and LE Audio — serious audio hardware in a true wireless earbud.
• EarFun Air Pro 4+ biggest trade-off: it's a full earbud system you have to charge, pair and manage through an app, and its translation feature depends on keeping the EarFun Audio App updated.
• Avantree Relay & SoundJet biggest strength: it pairs two Bluetooth headphones at once and runs up to 25 hours on a charge, with aptX Adaptive over a 3.5mm AUX input — a purpose-built airplane accessory.
• Avantree Relay & SoundJet biggest trade-off: it is a Bluetooth transmitter only. It does not work with TVs, phones, tablets, hearing aids or musical instruments, so its usefulness is narrow by design.
• Who each pick is for: daily listeners who want one do-everything earbud → EarFun Air Pro 4+. Travelers and couples who want to share in-flight audio → Avantree Relay & SoundJet.
The Air Pro 4+ is the more ambitious product of the two, and the spec sheet shows it. Inside each earbud there's a hybrid driver setup: a 10mm composite dynamic driver handling the low end, paired with an ultra-light FeatherBA balanced armature for the highs. EarFun angles that armature 11 degrees to reduce high-frequency attenuation, which is the kind of detail that usually shows up in how vocals and cymbals stay clean instead of turning brittle. The rated frequency range runs 20Hz to 40kHz, so there's headroom well beyond what most streaming services even deliver.
The connectivity side is where the "APTX HD" angle really lives. The QCC3091 chipset and Snapdragon Sound certification bring aptX Lossless into play, and the earbuds also cover LDAC, LC3 and LE Audio. In plain terms: if your phone or player supports a high-quality codec, the Air Pro 4+ has a good chance of using it. That's the practical difference between "Bluetooth earbuds" and "earbuds built around better-than-standard Bluetooth audio." Noise cancelling is rated up to 50dB with adaptive hybrid ANC that adjusts itself to the surroundings, and six AI-enhanced ENC microphones work on call clarity.
The extra feature worth knowing about is real-time AI translation across 100+ languages through the EarFun Audio App, with both real-time and face-to-face modes. It's a genuinely unusual addition for a pair of earbuds.
Who should buy it: anyone who wants one pair of in-ear Bluetooth earbuds for commuting, calls, workouts and travel, and who cares about codec quality and active noise cancelling. Who should skip it: if your actual problem is getting two people's headphones connected to an airplane seat-back screen, this isn't that product — and if you don't want to manage an app for the translation and control features, some of the appeal goes away.
The Relay & SoundJet R1 Bundle is a specialist, and it's refreshingly honest about it. It's an airplane Bluetooth adapter with a 3.5mm AUX input — you plug into the seat-back jack and it broadcasts that audio wirelessly to your headphones. Powered by a Qualcomm chipset with aptX Adaptive, it's tuned to deliver balanced, dependable sound for the length of a flight rather than to be a general-purpose audio device.
Its headline trick is connecting two Bluetooth headphones or AirPods at the same time, so a couple or two travel companions can watch the same in-flight movie side by side without splitting a headphone cable. Battery life is rated up to 25 hours on a single charge, which comfortably covers long international routes.
The limits matter just as much as the features. Avantree states plainly that it is not compatible with TVs, hearing aids or musical instruments, and that as a transmitter it does not pair with phones or tablets. So it isn't a gadget you'll use at home on the couch or at your desk. It's a travel accessory that earns its place in a carry-on and then sits in a drawer between trips.
Who should buy it: frequent flyers, couples and travel partners who want to share one screen, and anyone who wants their own noise-cancelling headphones on a plane without a tangled splitter. Who should skip it: if you mostly listen at home, on your phone or at a desk — this is the wrong tool entirely, and its compatibility list rules out most of those scenarios anyway.
• Best for everyday listening → EarFun Air Pro 4+. True wireless earbuds with a hybrid dual-driver system cover commuting, calls and workouts; the Avantree is a single-purpose transmitter.
• Best for high-quality codec support → EarFun Air Pro 4+. aptX Lossless, LDAC, LC3 and LE Audio versus aptX Adaptive on the Avantree — both are strong, but the EarFun's codec list is broader.
• Best for sharing audio with a travel partner → Avantree Relay & SoundJet. Two headphones at once is exactly what it's built to do, and the EarFun has no equivalent feature.
• Best for long flights on a single charge → Avantree Relay & SoundJet, with up to 25 hours of playtime designed around international travel.
• Best for blocking out noise → EarFun Air Pro 4+. Adaptive hybrid ANC rated up to 50dB, versus a transmitter that doesn't do noise cancelling at all.
• Best for clear calls → EarFun Air Pro 4+, thanks to six AI-enhanced ENC microphones. The Avantree has no microphone function for calls in the data provided.
• Best for travel beyond the plane → EarFun Air Pro 4+, since the Avantree explicitly won't work with phones, tablets, TVs, hearing aids or instruments.
• Best if you already own great headphones → Avantree Relay & SoundJet. It's the cheaper-feeling route to using the cans you already love on a plane; just check the current price on Amazon before you commit.
If I had to pick one, I'd buy the EarFun Air Pro 4+. In my opinion it's the more versatile purchase by a wide margin: it handles music, calls, noise cancelling and even translation, and its codec support — aptX Lossless, LDAC, LC3 and LE Audio — makes it the better fit for anyone searching for aptX HD-class earbuds. The Avantree Relay & SoundJet is genuinely excellent at one thing, and if that one thing is your problem, buy it without hesitation. But as a single purchase for most people, the earbuds do far more, far more often.
FAQ
which earbuds support aptx hd
Among these two, the EarFun Air Pro 4+ is the earbud option — it's built on the Qualcomm QCC3091 SoC with Snapdragon Sound and aptX Lossless, plus LDAC, LC3 and LE Audio support. The Avantree Relay & SoundJet is not an earbud at all; it's a transmitter that uses aptX Adaptive to send audio to headphones you already own.
No. Avantree states it isn't compatible with TVs, hearing aids or musical instruments, and as a Bluetooth transmitter it doesn't pair with phones or tablets. Its input is a 3.5mm AUX connection, so it's meant for sources like an airplane seat-back jack.
They're not competing for the same job, so value depends on your use case. For daily listening, noise cancelling and high-quality codecs, the EarFun Air Pro 4+ does more per purchase in my opinion. For sharing in-flight audio between two people, the Avantree Relay & SoundJet is the only one of the two that can do it — check the current price on Amazon for both before deciding.
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