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 TV headphone system that makes dialogue clearer and lets you listen at your own volume without disturbing anyone else, choose Avantree HT5009; if you need ultra-low-latency wireless monitoring for a guitar, bass, keyboard, mixer or amp, choose syndesmos 2.4GHz.
• Avantree HT5009's biggest strength: it's a purpose-built TV watching system — an over-ear headset plus a wireless transmitter and charging dock, with Clear Voice dialogue enhancement, Volume Boost and up to 60H of battery life.
• Avantree HT5009's biggest trade-off: it's built for television, not for music production. It needs a TV with Optical (TOSLINK) or 3.5mm AUX output, it won't work with HDMI-ARC-only TVs, and it is explicitly not a hearing aid.
• syndesmos 2.4GHz's biggest strength: 2.4GHz plug-and-play monitoring at roughly 20ms latency, with 50mm neodymium drivers tuned for a flat, transparent response — plus Bluetooth 5.3 and wired 3.5mm/6.35mm options in the same headset.
• syndesmos 2.4GHz's biggest trade-off: it's a studio tool first. The 6.35mm workflow, mode switching and reference-flat tuning are overkill for someone who just wants clearer TV dialogue.
• Pick Avantree HT5009 if you're a TV watcher, a senior, or part of a household where one person wants louder, clearer speech at night.
• Pick syndesmos 2.4GHz if you play or record instruments and latency, tonal accuracy and jack compatibility matter more than couch-friendly TV features.
The HT5009 Plus is built around a single problem: one person in the room wants the TV louder than everyone else. The kit pairs an over-ear headset with a wireless transmitter and a charging dock, so the headphones have a permanent home on the shelf rather than a tangle of cables. Drop them on the dock when you're done, pick them up when the next episode starts.
The two features that matter most here are Clear Voice and Volume Boost. Clear Voice is designed to pull dialogue forward so speech in shows, news and films is easier to follow — that's the specific complaint this product targets. Battery life is rated up to 60 hours, with a 2-hour charge time and a 50-hour average life figure in the specs, so a nightly viewer isn't charging constantly. The headset is over-ear with a plastic-and-silicone build, 32 ohm impedance, a hybrid driver and a 20Hz–20,000Hz range, connecting over Bluetooth 5.3 with a 10-meter range.
Who should skip it? Anyone expecting hearing-aid-level amplification. Avantree is direct about this: it's a TV headphone system for clarity, not a medical device for severe hearing loss. And if you mainly want headphones for music, gaming or instrument monitoring, this isn't the tool.
syndesmos 2.4GHz: Who It's For
The syndesmos Ars100 solves a different problem: being tethered to an amp or interface while you play. The transmitter plugs into your gear's jack and acts as a wireless bridge to the headset — no menus, no pairing dance. You plug in, you play, and you can walk around your pedalboard, mixer or amplifier while you do it. That's the whole appeal.
The latency figure is the headline: roughly 20ms in 2.4GHz mode. For monitoring your own playing, that's the difference between feeling connected to your instrument and fighting a slap-back echo. The audio side is aimed at accuracy rather than excitement — 50mm high-precision neodymium drivers with a single-layer PET diaphragm, tuned for a transparent, flat response, with 98±3dB sensitivity and a 20Hz–20kHz frequency response. Clean mids and crisp highs are the goal, which is what you want when you're dialing in a tone or checking a mix rather than just enjoying a track.
Connectivity is genuinely flexible. The 2.4GHz dongle handles latency-critical monitoring; Bluetooth 5.3 covers casual listening from a phone or tablet; and the included 3.5mm and 6.35mm cables keep you compatible with legacy interfaces and pro consoles. There are also Music, Bass and Guitar modes tuned for different scenarios, so you can match the tuning to what you're hearing.
Battery is split by mode: up to 40 hours in 2.4GHz and up to 55 hours in Bluetooth, with a 1–2 hour charge. That's plenty for long sessions, though the 2.4GHz figure is the one that matters if you're monitoring all day.
Who should skip it? Anyone whose main goal is TV. There's no optical input, no dialogue enhancement, no charging dock and no TV-first ergonomics here. The 1-year manufacturer warranty is also shorter than Avantree's 24-month coverage. This is a musician's and producer's headset, and it's happiest plugged into an instrument or a console.
• Best for TV watching → Avantree HT5009. Optical and AUX inputs, Clear Voice, Volume Boost and a charging dock are all built for the living room.
• Best for instrument monitoring → syndesmos 2.4GHz. Roughly 20ms latency over 2.4GHz is the reason it exists.
• Best for household peace → Avantree HT5009. Listen at your own volume while the room stays quiet — or route audio to a soundbar via pass-through if your TV mutes its speakers.
• Best for studio and mixing work → syndesmos 2.4GHz. Flat, transparent 50mm neodymium drivers and 6.35mm compatibility suit interfaces, mixers and amps.
• Best for battery life → Avantree HT5009, at up to 60 hours, versus 40 hours in 2.4GHz and 55 hours in Bluetooth on the syndesmos.
• Best for connection flexibility → syndesmos 2.4GHz. 2.4GHz wireless, Bluetooth 5.3 and wired 3.5mm/6.35mm in one headset.
• Best for simpler setup → syndesmos 2.4GHz. Plug the transmitter into a jack and go. The HT5009 needs you to confirm your TV has Optical or AUX and set the audio format to PCM.
• Best for warranty coverage → Avantree HT5009, with 24 months versus syndesmos's 1 year.
• Best for seniors wanting clearer speech → Avantree HT5009 — as long as you understand it is not a hearing aid.
In my opinion, these two barely compete — they're aimed at different rooms in the house. If your problem is that you can't follow TV dialogue without cranking the volume, I'd buy the Avantree HT5009. Clear Voice, Volume Boost, the charging dock and up to 60 hours of battery are exactly the features that solve that problem, and the 24-month warranty backs it up. Just check your TV has Optical or AUX output first.
If you play guitar, bass or keys and want to move around without a cable, I'd buy the syndesmos 2.4GHz. Roughly 20ms latency, flat reference tuning and the 6.35mm workflow are the reasons to choose it, and the Bluetooth mode makes it useful after the session ends. Buying either one for the other's job would be a waste.
how to connect wireless headphones
It depends on the system. On the Avantree HT5009 you plug the optical or AUX cable into the TV and the transmitter, select Optical in your TV's sound settings, set the audio format to PCM, then power on the headphones. On the syndesmos 2.4GHz you plug the transmitter into your instrument, amp or interface jack and it pairs instantly — or you pair over Bluetooth 5.3 for casual listening.
how to use wireless headphones
For TV, the HT5009 is used with its transmitter for stable audio and better lip-sync, with Clear Voice engaged to lift dialogue. For instruments, the syndesmos is used with the 2.4GHz dongle for low-latency monitoring, and you can switch between Music, Bass and Guitar modes depending on what you're listening to. Both are over-ear designs worn the same way; the difference is what you plug them into.
how to wireless headphones work
Both rely on a transmitter that sends audio wirelessly to a receiver in the headset. The Avantree uses Bluetooth 5.3, with roughly a 10-meter range, and its transmitter connects to your TV's optical or AUX output. The syndesmos uses a 2.4GHz link for roughly 20ms latency on instruments, and Bluetooth 5.3 for phone or tablet listening, plus wired cables when you want them.
Yes, and this is the most common mistake with TV headphones. The Avantree HT5009 works with TVs that have Optical (TOSLINK) or 3.5mm AUX output; TVs with HDMI-only audio may need an HDMI audio adapter. If you connect over Optical and get no sound, set your TV's digital audio output to PCM rather than Dolby or Auto. The syndesmos has no optical input, so it isn't a TV-first product.
If price is the deciding factor for you, check the current price on Amazon using the button on this page — that's the one thing a spec comparison like this can't tell you.
As an Amazon Associate I earn from qualifying purchases.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.
When you buy through links on this page, we may earn a commission from qualifying purchases at no extra cost to you.
Amazon and the Amazon logo are trademarks of Amazon or its affiliates. This site is an independent third-party review and is not affiliated with, endorsed by, or sponsored by Amazon or the product brands mentioned.
See also: Waxop Headphones vs syndesmos 2.4GHz, Avantree C171 vs Vonztek Headset: Headphones With Mic, Xmenha Earbuds vs ROEL-PLAY Earbuds: Wireless Headphones