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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-23 · 7 min read · Independent comparison
• Edifier W820NB biggest strength: over-ear comfort at just 220g with memory-foam cushioning, plus up to 49 hours of playback on a full charge.
• Edifier W820NB biggest trade-off: it's a full-size headphone on Bluetooth 5.2, so it's bulkier to carry and doesn't offer a gaming low-latency mode or multipoint pairing in the specs.
• ROSESELSA Ceramics MK2 biggest strength: true wireless earbuds with Bluetooth 6.0, dual-device multipoint, a 47ms game mode and up to 45 hours total with the case.
• ROSESELSA Ceramics MK2 biggest trade-off: in-ear buds mean a smaller soundstage feel and an IPX4 sweat rating rather than a full over-ear seal.
• Choose Edifier W820NB if you want one comfortable pair for commuting, work and long listening sessions.
• Choose ROSESELSA Ceramics MK2 if you want pocketable buds for calls, gaming and switching between phone and laptop.
The W820NB is built around a 40mm composite diaphragm driver with a titanium-coated coating, paired with LDAC decoding for high-resolution wireless audio. In plain terms, that's a large driver in an over-ear shell, which is the kind of setup that tends to move air and give music a fuller body than a tiny in-ear bud can. Edifier also tunes the impedance at 32 ohm across an approximate 20Hz–20,000Hz range, a standard full-range figure. If you mostly stream from a phone or laptop and want LDAC to do its thing, this is the format where that codec has the most room to work.
Comfort is clearly the headline here. The headset weighs only 220g and uses memory-foam cushioning that Edifier describes as a zero-pressure design, and the specs note it's meant to work even while wearing glasses. That matters more than people expect: an over-ear that clamps too hard becomes unbearable after an hour. Add hybrid active noise cancellation rated to -43dB, and you get a pair that recognizes ambient noise and adjusts, which is genuinely useful on a bus, in an open office or on a plane. Battery life is the other standout: up to 49 hours on a full charge, and a 10-minute top-up gives roughly 7 hours. That fast-charge figure is the one that saves you when you forgot to plug in the night before.
ROSESELSA Ceramics MK2: Who It's For
The Ceramics MK2 is a true wireless in-ear design, and the spec sheet reads like a list of features aimed at people who live on their phone. Inside is a titanium-coated dome composite diaphragm with a flexible surround, a 24-bit DAC chip and an upgraded HR+ Planck structure, with a 113dB SNR figure. ROSESELSA says the tuning follows the equal-loudness contour so the signature tracks how the ear perceives different frequencies. I read that as a deliberate attempt to keep bass and treble balanced rather than boosting one to impress on first listen. The metal-and-composite housing and the "Night" color give it a more premium build than the price-conscious segment it's clearly targeting.
Noise cancellation is rated to 40dB wideband, driven by a SoC-based algorithm and a reworked acoustic chamber. The interesting claim is that it reduces ear pressure compared with conventional hybrid feedback ANC and does so with minimal impact on sound quality. That's a real-world concern for in-ears: heavy ANC can create a plugged, pressurized feeling. The LDAC support is the headline for audio purists — ROSESELSA points out that many rivals at this tier drop high-res codecs to save cost, and LDAC roughly triples the data rate of standard SBC. Calls get an AI neural network for background noise reduction plus dedicated silicone mics, and dual-device multipoint lets you jump between a laptop and a phone without re-pairing.
Battery is 45 hours total with 12 hours from a single charge in the premium steel-shell cell, and the 47ms game mode is there for mobile gaming. IPX4 covers sweat and light splashes, so workouts and commutes are fine, though it isn't a swim-or-downpour rating. The companion app is ad-free with no login required, which is a small thing that a lot of people quietly appreciate. Who should buy it: gym-goers, gamers, commuters who take calls and anyone juggling two devices. Who should skip it: if you want the open, roomy presentation of a large over-ear driver or you dislike anything sitting inside your ear canal for hours.
Side-by-Side: Which Should You Choose?
• Best for battery life → Edifier W820NB, with up to 49 hours on a single charge versus 45 hours total (12 hours per charge plus case) for the Ceramics MK2.
• Best for portability → ROSESELSA Ceramics MK2, because true wireless buds store in a case instead of hanging around your neck.
• Best for device switching → ROSESELSA Ceramics MK2, thanks to dual-device multipoint; the W820NB specs don't list this.
• Best for gaming → ROSESELSA Ceramics MK2, with its 47ms low-latency game mode; the W820NB is tuned for music and calls.
• Best for all-day comfort at a desk → Edifier W820NB, with its 220g weight, memory-foam cushions and glasses-friendly fit.
• Best for workouts → ROSESELSA Ceramics MK2, as in-ear buds with IPX4 sweat resistance suit movement better.
• Best for quiet commuting → Edifier W820NB if you prefer the deeper seal of an over-ear, or Ceramics MK2 if you want strong cancellation in a smaller package.
• Best for wireless signal generation → ROSESELSA Ceramics MK2, which uses Bluetooth 6.0 versus Bluetooth 5.2 on the Edifier.
If I were buying for myself and my listening happened mostly at a desk, on a train or on the sofa, I'd take the Edifier W820NB. The combination of a 40mm LDAC driver, -43dB hybrid ANC, 220g of comfort and up to 49 hours with a 7-hour quick charge is exactly what long-session listening needs. I'd only switch to the ROSESELSA Ceramics MK2 if portability, multipoint and a game mode were my priorities, because that's where it clearly wins. Both deliver LDAC, so pick the shape that fits your day, and check the current price on Amazon before you commit.
what is ldac headphones
LDAC is a high-resolution Bluetooth audio codec that transmits roughly three times the data of standard SBC, so more musical detail survives the wireless link. In practice, "LDAC headphones" means the device supports that codec, which both the Edifier W820NB and ROSESELSA Ceramics MK2 list in their specs.
what is ldac support in headphones
It means the headphones can decode Sony's LDAC codec when the source device also supports it. On the W820NB, Edifier pairs LDAC with a 40mm titanium-coated composite diaphragm; on the Ceramics MK2, ROSESELSA pairs it with a 24-bit DAC chip and a titanium-coated dome diaphragm.
what is ldac codec in headphones
The LDAC codec is the compression method used to carry audio over Bluetooth at a higher bitrate than SBC, which is why it's associated with hi-res wireless listening. Both products here support it, so the difference between them isn't the codec — it's over-ear versus in-ear, battery, multipoint and game mode.
what is ldac sony headphones
LDAC was developed by Sony, so "LDAC Sony headphones" refers to Sony models using that codec. It isn't exclusive to Sony, though — third-party brands like Edifier and ROSESELSA license and use it too, which is why you'll see LDAC on both of these.
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See also: eppfun Audio Receiver vs Amazon Renewed Edifier W820NB, Amazon Renewed Edifier W820NB vs FiiO EH11, Final Audio ZE3000 vs JBL Sense Pro Open: Ldac Headphones