How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a dedicated aptX HD transmitter that turns any airplane 3.5mm jack into a two-headphone listening party, choose Avantree Relay & SoundJet; if you need aptX HD earbuds that also handle noise cancelling, lossless-grade streaming and real-time translation, choose EarFun Air Pro 4+.
• Avantree Relay & SoundJet — biggest strength: a Qualcomm chipset with aptX Adaptive & aptX HD plus Bluetooth 5.3, built specifically to stream audio from a 3.5mm AUX jack to two Bluetooth headphones at once, with up to 25 hours of playback.
• Avantree Relay & SoundJet — biggest trade-off: it is not an earbud and not a phone or car-stereo gadget. Avantree states plainly it does not work with phones, car stereos or hearing aids, so it only makes sense as a travel adapter.
• EarFun Air Pro 4+ — biggest strength: a full-featured in-ear pair with a hybrid 10mm dynamic driver plus balanced armature, Qualcomm QCC3091, Snapdragon Sound with aptX Lossless, LDAC/LC3/LE Audio support, up to 50dB adaptive ANC and six AI ENC mics.
• EarFun Air Pro 4+ — biggest trade-off: there is no 3.5mm jack and no airplane-adapter function, so it cannot share in-flight audio with a second pair of headphones the way the Avantree can.
• Who each pick is for: the Avantree is for flyers and gym-goers who want their own headphones to work wirelessly off a wired source; the EarFun is for someone who wants one pair of earbuds to do sound, silence and calls everywhere else.
Think of the Avantree Relay & SoundJet as a bridge, not a pair of headphones. Its whole job is to sit between a 3.5mm AUX output and your Bluetooth headphones, and it does that with a premium Qualcomm chipset running aptX Adaptive and aptX HD over Bluetooth 5.3. If you already own AirPods, Bose or any other Bluetooth headphones and you fly a few times a year, this is the kind of accessory that quietly solves the "airplane screen, my headphones" problem without you buying anything new to wear.
Who should skip it? Anyone hoping for an all-rounder. Avantree is explicit that it is not compatible with phones, car stereos or hearing aids, so it is not a substitute for a normal Bluetooth transmitter setup at home and it is not a hearing-assist device. If you want one product that plays music from your phone, cancels noise and takes calls, this is the wrong tool — that is the EarFun's territory. Buy the Avantree if your headphones are already good and your problem is the wire.
EarFun Air Pro 4+: Who It's For
The EarFun Air Pro 4+ is the opposite kind of product: a self-contained in-ear system where the sound, the silence and the software all live in the buds. The driver setup is genuinely interesting — a 10mm composite dynamic driver paired with a feather-light balanced armature in a hybrid configuration, with an 11-degree angle alignment that EarFun says reduces high-frequency attenuation. The claimed frequency range runs 20Hz to 40kHz, and the tuning story is robust bass, articulate mids and sparkling treble. On paper, that is a two-driver design doing what single-driver earbuds struggle to do: cover both ends of the spectrum without mushing the middle.
The wireless side is where the aptX HD angle really lands. Qualcomm's QCC3091 SoC, Snapdragon Sound certification with aptX Lossless, plus LDAC, LC3 and LE Audio support — that is a broad codec menu, and it means you are not locked into one ecosystem to get high-quality audio. The adaptive hybrid ANC is rated up to 50dB and adjusts itself based on your surroundings, and six AI-enhanced ENC microphones are there for call clarity. There is also real-time AI translation across 100+ languages through the EarFun Audio App, with both Real-Time and Face-to-Face modes, provided the app is kept up to date.
Who should buy it? Someone who wants one pair of earbuds to be the default: commute, office, calls, travel, streaming from a phone that supports these codecs. Who should skip it? Anyone whose main need is sharing airplane audio with a second person, or anyone who prefers over-ear headphones and just needs to make them wireless — the EarFun has no headphone jack at all. Controls live in the app, which is great if you like tuning things and mildly annoying if you do not.
• Best for aptX HD on a plane → Avantree Relay & SoundJet. It is the only one of the two that plugs into a 3.5mm AUX jack and transmits in aptX Adaptive & aptX HD.
• Best for aptX HD earbuds → EarFun Air Pro 4+. Qualcomm QCC3091 with Snapdragon Sound, aptX Lossless, plus LDAC, LC3 and LE Audio.
• Best for sharing audio with a partner → Avantree Relay & SoundJet. Two Bluetooth headphones connected at once, synced for movies and music.
• Best for noise cancelling → EarFun Air Pro 4+. Adaptive hybrid ANC rated up to 50dB, which the Avantree simply does not offer.
• Best for battery life → Avantree Relay & SoundJet. Up to 25 hours of continuous playback, versus no playback figure published for the EarFun buds.
• Best for calls → EarFun Air Pro 4+. Six AI-enhanced ENC microphones built for clearer voice pickup.
• Best for travel extras → EarFun Air Pro 4+. Real-time translation across 100+ languages in the app, plus in-ear portability.
• Best for people who already love their headphones → Avantree Relay & SoundJet. Keep the headphones you own; just cut the cable.
In my opinion, the right choice comes down to one question: do you want a better pair of earbuds, or do you want your existing headphones to work wirelessly on a plane? If it is the second, I would buy the Avantree Relay & SoundJet — the dual-headphone support, aptX Adaptive & HD over Bluetooth 5.3 and up to 25 hours of playback make it the more useful object for travel, and it costs you nothing in terms of replacing gear you already like. If you want one pair of earbuds to do everything — aptX Lossless, up to 50dB adaptive ANC, six-mic calls and translation — I would buy the EarFun Air Pro 4+. For most people who are not frequent flyers, that is the pick I would hand over.
which earbuds support aptx hd
Based on the data sheets, the EarFun Air Pro 4+ is the earbud option here: it uses Qualcomm's QCC3091 SoC, is certified for Snapdragon Sound with aptX Lossless, and supports LDAC, LC3 and LE Audio. The Avantree Relay & SoundJet also handles aptX Adaptive and aptX HD, but it is a Bluetooth adapter you plug into a 3.5mm AUX jack, not a pair of earbuds.
Yes — Avantree lists compatibility with AirPods, Bose and all Bluetooth headphones. You plug the adapter into a 3.5mm AUX jack, such as an airplane seat's audio output, and stream to your headphones. Avantree does note it is not compatible with phones, car stereos or hearing aids.
On the Avantree Relay & SoundJet, yes — it supports two Bluetooth headphones connected at once with synced playback, which is ideal for sharing in-flight entertainment. The EarFun Air Pro 4+ is a standard in-ear pair with no stated dual-headphone sharing feature.
Yes. Both are different categories of product — a travel adapter versus ANC earbuds — so what you pay depends entirely on which job you need done. This page does not list prices; use the "Check latest price on Amazon" button to see the current figures for each before you commit.
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