How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-08 · 8 min read · Independent comparison
• Avantree Opera — best for long workdays of calls and TV audio in one spot; pick this if you want over-ear Bluetooth with a 35-hour battery and a dock that keeps it charged.
• SleepPhones AcousticSheep Classic — best for side-sleepers and anyone who takes calls lying down; pick this if flat speakers inside a washable fleece headband sound better than earbuds digging into your ear.
• SleepPhones AcousticSheep Classic — best for smaller heads and travel; pick this if the size S fleece band fits you better than the medium and you want a corded set with media controls.
• Sennheiser HD 400S — best for wired, no-battery calls at a desk; pick this if you want a closed-back over-ear with an inline mic and a folding frame you can toss in a bag.
The Opera is an over-ear wireless headphone that comes with its own transmitter and charging dock. That dock is the interesting part. Plug it into power and into your TV's optical or AUX port, switch both units on, and they pair themselves. If your TV already has Bluetooth built in, you can slide the transmitter to OFF and pair the headphones straight to the TV, using the dock purely as a charging stand. For anyone juggling a desk setup plus a living-room TV, that flexibility is the reason I put it first for calls.
The specs that matter day to day: Bluetooth 5.0 with a stated range up to 50 metres, 40 ms of audio latency, 32 ohm impedance, 96 dB sensitivity and a 20 Hz–20 kHz dynamic driver. In plain terms, 40 ms is low enough that lip-sync on video calls and streamed TV stays tolerable, and the 50 m figure means you can walk to the kitchen mid-call without the audio dropping. Two EQ modes plus a volume level tuned louder than typical headphones help if you struggle to hear dialogue or a quiet caller. Battery is rated at 35 hours with a 2-hour charge time, which realistically covers several days of meetings before you dock it again.
The feature I'd single out for shared living space is pass-through. Because the dock sits between your TV and your soundbar or AV receiver, you can listen through the headphones at your own volume while everyone else keeps hearing the speakers. No unplugging, no arguments. There's also a one-click mute, which is handy during ad breaks or when you need to talk to someone in the room.
This is a completely different idea of comfort. Instead of cups clamping your ears, you get ultra-thin flat speakers slid inside a soft fleece headband. The band is breathable, hypoallergenic and doubles as an eye mask, and because the speakers are removable, the fabric is machine washable. For anyone who takes calls or listens to podcasts while lying on their side, that's the whole point — there's no hard shell pressing into your head or pillow.
This medium fleece version is the most common size and fits most adults, so it's the sensible starting point if you're unsure. The 48-inch braided cord ends in a standard 3.5 mm plug, which means it works with any device that has that jack; a few phones and tablets will need an adapter. Controls are on the cord, with a volume control, and the 32 ohm dynamic drivers cover 20 Hz–20 kHz — normal, listenable sound rather than audiophile tuning.
Who is this for? Light sleepers, frequent travellers, people with ringing in the ears, and side-sleepers who want audio without earbuds. The fabric was designed by a family physician as a drug-free sleep aid, and the concept has been around since 2007. On a call, the flat speakers sit against your ear through fabric, so voice quality is adequate rather than crisp — I'd treat this as a listening and sleep aid that can handle a call, not a headset built for call quality first.
The main trade-off is the cord. Forty-eight inches is generous, but it's still a wire, and there's no microphone or inline call button on this Classic version. Noise control is passive only. If you want wireless, this isn't the model. If you want something you can fall asleep in without your ears aching, it is.
SleepPhones AcousticSheep Classic
This is the same SleepPhones Classic design in size S, in midnight black fleece. Same ultra-thin flat speakers, same removable-speaker headband you can machine wash, same 48-inch braided cord and 3.5 mm plug, same 32 ohm drivers and 20 Hz–20 kHz range. The difference is the fit: small suits narrower heads and younger or smaller wearers better than the medium, and the black fleece is the less conspicuous option if you'll wear it on a plane or in a shared room.
Sizing matters more than people expect with a headband. Too loose and the speakers drift off your ear canal; too tight and the band presses. If you've tried the medium and found it slid around, this is the version to consider. Because the speakers are movable inside the band, you can nudge them onto your ear position, which helps.
In my opinion, this version makes the most sense for travellers and smaller-framed sleepers who want the same sleep-friendly design in a tighter, darker package. If you're between sizes and unsure, the medium is the safer default.
Sennheiser HD 400S
The HD 400S is the straightforward wired option: a closed-back over-ear headphone with a folding headband and an inline one-button remote with a microphone. You plug in, you press the button to answer or end a call, and you press it again to play or pause music. No pairing, no charging, no dock.
The closed-back, around-ear design is the comfort story here. Soft ergonomic ear pads and a secure fit are the reason Sennheiser frames it for long listening sessions, and closed cups also reduce ambient noise passively, so you hear less of an open office or a busy kitchen while you're on a call. The 32 mm transducers run at 18 ohms, which is unusually low impedance — that means a phone, laptop or controller drives them easily without a separate amp. Frequency range is 20 Hz–20 kHz with controlled bass and clear mids, which suits speech as much as music.
It weighs 7.65 ounces and folds down, so it packs into a bag without much fuss. That combination — light, foldable, wired, with a mic — is what makes it the pick for desk work, commuting and travel where you don't want to think about battery percentages.
The trade-offs are the cable and the isolation level. It's wired, so you're tethered to your device, and the noise reduction is passive only — no active cancellation. The jack is listed as 2.5 mm, so check whether you need an adapter for your particular source. If you want total freedom of movement on calls, look at the Opera instead; if you want zero fuss and no charging, this is the one.
I compared the published specifications and features for each set — driver type, impedance, frequency range, battery, connectivity, controls, materials, weight and foldability — and weighed them against the everyday reality of taking calls and listening for long stretches. The order reflects my own editorial judgement about comfort and fit for that job, not any brand's influence. No manufacturer paid for placement or reviewed this ranking before publication.
It depends on how you wear them. Over-ear models like the Opera and HD 400S spread pressure across the ear and head, which most people find easier for hours of use. The SleepPhones design goes further by removing hard cups entirely, but its flat speakers sit behind fabric, so voice pickup relies on your device rather than the headphones.
Not directly — the HD 400S is a wired headphone with a 2.5 mm jack and an inline remote. If you specifically want a wireless Bluetooth headset for calls, the Avantree Opera is the wireless pick in this group, with Bluetooth 5.0, a 50 m stated range and a 35-hour battery rating. Just confirm your device or TV supports the connection type you plan to use.
Two things. First, whether your TV has an optical (TOSLINK) or AUX (3.5 mm) output — the transmitter needs one of those. Second, if you're using optical, set your TV's audio output to PCM/Stereo, which the manufacturer recommends for best performance. Smart TVs with built-in Bluetooth can pair directly, with the dock acting as a charger.
They use a standard 3.5 mm plug on a 48-inch cord. Some devices will need an adapter to be compatible, so if your phone or tablet has dropped the headphone jack, plan for one.
If comfortable head phones for calls are the goal and you want wireless freedom with a dock that keeps everything charged, I'd start with the Avantree Opera.
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