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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a pocketable LDAC DAC/amp that upgrades the wired headphones you already own, choose Khadas Tea; if you need a complete wireless LDAC headphone you can just put on your head, choose Amazon Renewed Edifier W820NB.
• Khadas Tea — biggest strength: a real ESS ES9281AC Pro DAC plus Qualcomm QCC5125 Bluetooth in a 7.95 mm aluminum-and-glass slab that snaps to the back of a MagSafe phone, so your existing wired headphones suddenly play LDAC, PCM, DSD and MQA.
• Khadas Tea — biggest trade-off: it is not a headphone. It has no earcups, no ANC and no built-in drivers, and its Bluetooth radio only receives — it cannot transmit to wireless headphones or TWS earbuds.
• Amazon Renewed Edifier W820NB — biggest strength: a finished over-ear headphone with -49 dB hybrid ANC, LDAC Hi-Res Audio, up to 88 hours of playtime (49 with ANC) and 15 hours from a 15-minute charge.
• Amazon Renewed Edifier W820NB — biggest trade-off: it is a renewed unit covered by a 90-day limited warranty, it weighs 470 g, and it has no headphone jack at all — wireless or USB-C only.
• Who each is for: Khadas Tea is for the listener with a good pair of wired IEMs or headphones who wants better sound from a phone; the Edifier W820NB is for someone who wants one box, one charge and noise cancelling on a commute.
Khadas Tea is best understood as a small audio computer that lives on the back of your phone. Inside it sits an ESS ES9281AC Pro DAC and a Qualcomm QCC5125 Bluetooth chip, and the output is a single 3.5 mm jack. That combination is the whole point: streaming apps that serve lossless or Hi-Res material get converted by a dedicated converter instead of whatever tiny chip is squeezed into a phone or a dongle. It handles LDAC Bluetooth audio up to 24-bit/96 kHz, plus PCM, DSD and MQA decoding at up to 32-bit/384 kHz.
The physical design is what separates it from a desktop DAC. It is under 0.3 inches thick, made of aluminum with anti-fingerprint tempered glass, and it is MagSafe compatible, so it clings to the back of a compatible phone for a clean, flat stack in your pocket. A 1160 mAh battery gives up to 8 hours of continuous playback and, importantly, means the phone's own battery is not doing the amplification work. Output power is rated at 130 mW. There is also a built-in Bluetooth microphone, so calls can run through the Tea.
Amazon Renewed Edifier W820NB: Who It's For
The Edifier W820NB Plus Gen 2 is the opposite kind of product: it is the entire listening chain in one object. You charge it, put it on, and you are done. The headline number is the noise cancelling — hybrid ANC rated at -49 dB, with multiple modes that shift with your environment and physical buttons for quick switching, plus extra scenario presets for sport, office and travel inside the Edifier ConneX app.
For the LDAC angle, this is the practical route to Hi-Res wireless. The headphone supports LDAC, uses Bluetooth 6.1, and its dynamic drivers are rated across a 20 Hz–40 kHz frequency range. Battery life is unusually generous at up to 88 hours, or 49 hours with ANC engaged, and fast charging returns 15 hours of playback from a 15-minute top-up — the kind of figure that matters if you are the person who always forgets to charge before a flight.
Comfort and travel are clearly part of the brief: it is foldable, uses memory foam ear cushions, and is meant to fold into a bag. It also leans into call quality with AI noise cancellation that isolates your voice and suppresses background noise, and it adds spatial sound with EQ presets plus a volume guard that lets you set a maximum listening level. Two things to weigh honestly. First, it is a renewed item, so it carries a 90-day limited warranty rather than a full new-product term. Second, there is no headphone jack — connectivity is wireless or USB-C — and at 470 g it is a substantial thing to wear for hours.
Who should buy it: commuters, travelers, remote workers on calls, and anyone who wants ANC plus LDAC without buying a separate DAC or amp. Who should skip it: listeners who insist on a wired analog input, and anyone uncomfortable with renewed hardware and a short warranty window.
• Best for upgrading headphones you already own → Khadas Tea. It exists to make wired gear sound better, and it does that with a dedicated ESS DAC and LDAC support.
• Best for one-and-done wireless listening → Amazon Renewed Edifier W820NB. Drivers, amp, battery and ANC are all built in.
• Best for noise cancelling → Amazon Renewed Edifier W820NB. Khadas Tea has no ANC and no earcups at all; the Edifier is rated at -49 dB hybrid ANC.
• Best for battery endurance → Amazon Renewed Edifier W820NB. Up to 88 hours (49 with ANC) versus up to 8 hours on the Tea.
• Best for keeping your phone's battery alive → Khadas Tea. Its 1160 mAh battery carries the playback load instead of the phone.
• Best for DSD, MQA and 32-bit/384 kHz PCM → Khadas Tea. Those formats are outside what a Bluetooth headphone chain handles.
• Best for hands-free calls on the go → tie, with a caveat. The Edifier uses AI voice isolation; the Tea has a Bluetooth microphone but cannot drive wireless headsets.
• Best for a phone-friendly carry setup → Khadas Tea. At 7.95 mm thick with MagSafe compatibility, it disappears onto the back of a phone. The Edifier is the bulkier item at 470 g, though it folds.
In my opinion these two barely compete — they solve different problems, and the right answer depends on whether you already own good headphones. If you do, I would buy the Khadas Tea: the ES9281AC Pro and QCC5125 combination, the LDAC and DSD/MQA support, and that 7.95 mm MagSafe body make it the more interesting piece of gear, and it makes hardware you already like better. If you do not own a decent pair, I would buy the Amazon Renewed Edifier W820NB instead, because a DAC with nothing to plug into it is useless. Just accept the renewed warranty and the lack of a headphone jack going in. Check the current price on Amazon for whichever one you land on.
what is ldac headphones
LDAC is a high-resolution Bluetooth audio codec, and "LDAC headphones" simply means headphones that can receive it wirelessly. Both products here support LDAC — the Edifier W820NB as a wireless headphone, and Khadas Tea as a Bluetooth receiver feeding wired headphones through its 3.5 mm jack.
what is ldac support in headphones
It means the headphone can decode Sony's LDAC codec over Bluetooth instead of falling back to a lower-bitrate codec, which matters if your phone or player can transmit LDAC. The Edifier W820NB supports LDAC alongside Bluetooth 6.1, so a compatible source can send it higher-quality audio.
what is ldac codec in headphones
The LDAC codec is the encoding method used to push more audio data over a Bluetooth link than standard codecs allow. Khadas Tea handles LDAC up to 24-bit/96 kHz on its Bluetooth input side, then converts that signal with its ESS ES9281AC Pro DAC before sending it out the 3.5 mm jack.
what is ldac sony headphones
LDAC was developed by Sony, so "LDAC Sony headphones" usually refers to Sony models that support it. You are not limited to Sony hardware, though — any source and any receiving device that supports LDAC can use it, which is why the Edifier W820NB and Khadas Tea both list it.
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