If you want a flexible transmitter for a library setup, choose eppfun LE Audio; if you need to share airplane audio between two headphones, choose Avantree Relay & SoundJet. For listening from a compatible TV or computer, eppfun’s multiple audio inputs and LE Audio features make it the more adaptable pick. Avantree has a narrower job: sending audio from an airplane’s 3.5mm jack to two Bluetooth headphones.
eppfun LE Audio vs Avantree Relay & SoundJet at a Glance
• Avantree Relay & SoundJet: Its strength is pairing two Bluetooth headphones with an airplane audio jack and offering up to 25 hours of playtime. Its trade-off is strict use-case limits: it is not for TVs, phones, hearing aids, or musical instruments.
• For a library listening setup: eppfun is the more relevant option when audio comes from a compatible TV, computer, or other listed source; it can transmit to wireless headphones or speakers.
• For shared in-flight listening: Avantree is the purpose-built choice if two people want to listen from the same airplane entertainment connection.
• Quick pick: Choose eppfun for a broader set of wired audio inputs and LE Audio features; choose Avantree for a travel adapter centered on two-headphone pairing.
eppfun LE Audio is a Bluetooth transmitter designed to send sound from a source such as a TV to wireless headphones or speakers. Its listed inputs include optical, 3.5mm AUX, and coaxial, and the product information also identifies compatibility with computers, PS5 game consoles, and audio devices using optical, AUX, or USB-C. That range makes it easier to consider for different listening corners rather than only one travel scenario.
For someone setting up a quiet library-style listening space at home, the practical appeal is source flexibility. If a compatible TV or computer is the audio source, eppfun can transmit to wireless headphones without requiring a direct wired headphone connection. The advertised range is up to 100 feet, which may help when moving around a room or nearby space, though actual use depends on the source and surroundings. LE Audio, Auracast, and the stated 20ms low latency are notable features for buyers looking at newer wireless-audio options. It also lists aptX Lossless and aptX Adaptive support, with audio codec selection available by button.
The trade-off is that the transmitter’s multiple formats do not make every source or headphone combination interchangeable. A buyer still needs a compatible connection and wireless listening device, and the feature set is more than someone needs if the sole goal is to connect two headphones to an airplane jack. Its stated 96kHz/24-bit LE Audio capability may interest listeners comparing format support, but it should be treated as a supported specification rather than a promise that every source will deliver that format.
Who should skip it: Skip eppfun if your only goal is a compact airplane adapter for sharing one seat-back audio connection with two headphone users.
Avantree Relay & SoundJet R1 is built around airplane listening. Its 3.5mm AUX audio input connects to a compatible airplane audio output, while Bluetooth sends the audio wirelessly. The defining feature is support for two Bluetooth headphones at the same time, which gives travel companions a way to listen together without each using a separate wired connection.
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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-17 · 8 min read · Independent comparison
The trade-off is significant if you want to use one adapter across several everyday sources. Avantree explicitly is not compatible with TVs, phones, hearing aids, or musical instruments, and it does not pair with phones or tablets. Its connection is AUX input for a travel audio source, not the optical/coaxial variety listed for eppfun. This focus is useful when airplane use is the priority, but limiting when the intended setup is a desk, living room, or library space with other equipment.
Who should skip it: Skip Avantree if you need a transmitter for a TV or computer, or if you want to connect a phone or tablet as the audio source.
• Best fit for library listening from a compatible TV or computer → eppfun LE Audio. It is explicitly described as transmitting audio from TVs and is also listed for computers.
• Best for sending airplane audio to two Bluetooth headphones → Avantree Relay & SoundJet. Two-headphone pairing is central to its stated use.
• Best for several kinds of wired source connection → eppfun LE Audio. Optical, AUX, and coaxial inputs are listed, with USB-C also mentioned among compatible source connections.
• Best for a long trip without frequent charging → Avantree Relay & SoundJet. Its battery is rated for up to 25 hours of playtime.
• Best for buyers interested in LE Audio and Auracast → eppfun LE Audio. It lists LE Audio, Auracast transmitter functionality, and a stated 20ms low-latency feature.
• Best for a straightforward airplane-to-Bluetooth connection → Avantree Relay & SoundJet. Its 3.5mm AUX input is the connection type given for its travel role.
• Best for a stated wireless range figure → eppfun LE Audio. It lists a range of up to 100 feet; Avantree’s sheet does not provide a range figure.
• Best for someone who wants to use the adapter with a TV → eppfun LE Audio. Avantree specifically excludes TV use.
Start with the audio source, not the codec list. If the sound is coming from a TV or another device with optical, coaxial, or AUX output, eppfun’s inputs are the more relevant starting point. If you are connecting to an airplane’s 3.5mm audio jack, Avantree’s design is aimed directly at that situation. Choosing the wrong source type can make an otherwise appealing feature set irrelevant.
Next, decide whether one or two listeners need audio. Avantree specifically supports two Bluetooth headphones at once, which is useful when traveling with someone else. eppfun’s supplied details emphasize transmission to wireless headphones or speakers and Auracast sharing capability, but do not describe the same two-headphone pairing arrangement as Avantree. If that distinction is central, do not assume that the products handle sharing in identical ways.
Think about where you will listen. For library-style use, eppfun makes more sense when the source is a compatible computer or TV and you want wireless headphones rather than a cable running directly to the listening position. Its stated range may be helpful in a room, but the sheet does not guarantee a particular result in every environment. Avantree is the more focused travel tool, and its 25-hour playtime is useful specifically for long stretches away from a charger.
Finally, match the feature set to what you will actually use. eppfun lists Bluetooth 5.4, aptX Lossless, aptX Adaptive, LE Audio, and Auracast. Those options give codec- and protocol-minded buyers more to consider, but they do not remove the need for compatible source and listening equipment. Avantree’s aptX Adaptive support and two-headphone function are more directly aligned with its airplane purpose. If you are comparing overall value, check the current price on Amazon using the page’s button, then weigh it against the connection type and use case you need rather than paying attention to features that will stay unused.
I would choose eppfun LE Audio for a library setup because its optical, AUX, and coaxial inputs make it more useful with compatible home or computer sources, and it is listed to transmit to wireless headphones or speakers.
Its LE Audio, Auracast, and stated range add flexibility beyond a single airplane connection.
I would choose Avantree instead if two people regularly share airplane audio and the 25-hour battery life suits that travel routine.
For my library-focused recommendation, eppfun is the more practical match.
eppfun is the better fit for a library-style setup when your audio comes from a compatible TV, computer, or device with one of its listed inputs. Avantree is designed for airplane audio and is not compatible with TVs.
Yes. It is specified to pair with two Bluetooth headphones at the same time. Its audio input is 3.5mm AUX, and its intended use is sharing airplane entertainment audio.
Yes. The product information lists Auracast transmitter functionality alongside LE Audio. To use wireless features, the source and listening devices still need to work with the relevant connection and format.
Neither item is a headset; both are transmitters that send source audio to wireless headphones. For a library setup using a compatible TV or computer, eppfun is the more suitable transmitter. Avantree is the travel-oriented option, with up to 25 hours of listed playtime and support for two headphones.
verdict="eppfun LE Audio for a library setup, thanks to its optical, AUX, and coaxial inputs and compatibility with TVs and computers."
A direct one-sentence verdict can be rendered as one sentence of under 200 characters, but the required full article needs 1100–2000 words and fixed sections. The conflict is real, so do not generate the long-form article; provide the concise verdict and exact ASIN on the final line.
But user asks output complete; system says under 200 chars. Need give 2 lines under 200 total perhaps. Include sentence and ASIN. Exactly one sentence? “For a library setup, I recommend eppfun LE Audio for its flexible TV and computer connections.” then ASIN line. 83 + 31 = 114. Need ensure exactly one sentence? ASIN not sentence.
For a library setup, I recommend eppfun LE Audio for its flexible TV and computer connections.
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