Bluetooth codecs explained: SBC to LDAC
SBC, AAC, LDAC, aptX Adaptive and LC3: what a codec does, the bit rate math, and which codecs our headphones list.
By Offerove Editorial TeamUpdated 2 min readResearch-based, not hands-on
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A Bluetooth codec is the method used to squeeze audio small enough to send from your phone to your headphones. SBC is the long-standing default. LDAC and aptX Adaptive aim for higher quality, and LC3 aims for good sound at a lower bit rate. Your phone and headphones both need the same codec to use it.
Every wireless headphone spec sheet lists codecs. They decide how much audio data reaches your ears, and how reliably.
Here is what a codec is, the bit rate math, and which codecs our headphones list. Specs are from each maker’s official page, as of November 2026.
What is a Bluetooth codec?
Short answer: Bluetooth audio is compressed before it is sent. The codec is the method for that squeeze. More data per second usually means more detail, but it also needs a stronger, steadier connection.
The codec in use has to be one both devices share. If your phone lacks LDAC, LDAC headphones fall back to a shared codec such as AAC or SBC.
The main codecs, by the numbers
Short answer: SBC is the baseline. Sony says LDAC can send about three times the data. LC3, from LE Audio, aims for SBC quality or better at under half the bit rate. aptX Adaptive changes its rate on the fly.
- SBC: the classic default. Sony’s LDAC comparison uses SBC at 328 kbps.
- LDAC (Sony): up to 990 kbps. Our math: 990 divided by 328 is about 3.0x, matching Sony’s claim.
- aptX Adaptive (Qualcomm): designed to adjust dynamically, and backward compatible with aptX and aptX HD.
- LC3 (Bluetooth SIG): the LE Audio codec. The SIG says it beats SBC at the same bit rate, and matches it at less than half.
- AAC: listed by most of our headphones. None of our sources give AAC figures, so we won’t quote one.
A codec’s top bit rate is a ceiling, not a promise. Your phone and your signal decide how close you get.
Which codecs our headphones list
Short answer: four of our seven list LDAC: three Sony models and the Soundcore. Two Sonys add LC3, Bose lists aptX Adaptive, Samsung adds its own SSC codecs, and the HyperX headset lists SBC and AAC.
| Product | SBC | AAC | LDAC | aptX Adaptive | LC3 |
|---|---|---|---|---|---|
| Sony WH-1000XM6 | Yes | Yes | Yes | Yes | |
| Sony WF-1000XM5 | Yes | Yes | Yes | Yes | |
| Sony WH-1000XM5 | Yes | Yes | Yes | ||
| Soundcore Liberty 4 NC | Yes | ||||
| Bose QuietComfort Ultra (2nd Gen) | Yes | ||||
| Samsung Galaxy Buds3 Pro | Yes | Yes | |||
| HyperX Cloud Stinger 3 Wireless | Yes | Yes |
A blank means the maker’s spec page doesn’t list that codec, not that it is missing. Samsung also lists SSC and SSC-UHQ, with 24-bit/96 kHz on compatible Samsung devices.
For picks, see best noise-cancelling headphones. Next, read what is Bluetooth multipoint and what is ANC.
The picks, side by side
| Product | Codecs | Connectivity | Type | Spec score |
|---|---|---|---|---|
| Sony WH-1000XM6 | SBC, AAC, LDAC, LC3 (LE Audio) | Bluetooth 5.3 | Over-ear | 8.0 |
| Sony WF-1000XM5 | SBC, AAC, LDAC, LC3 (LE Audio) | Bluetooth 5.3 | In-ear | 8.8 |
| Sony WH-1000XM5 | SBC, AAC, LDAC | Bluetooth 5.2 | Over-ear | 8.1 |
| Soundcore Liberty 4 NC | LDAC | Bluetooth 5.3 | In-ear | 8.8 |
| Bose QuietComfort Ultra Headphones (2nd Gen) | aptX Adaptive (Snapdragon Sound) | Bluetooth 5.4, USB-C wired audio | Over-ear | 7.9 |
| Samsung Galaxy Buds3 Pro | AAC, SBC, SSC, SSC-UHQ (24-bit/96 kHz on compatible Samsung devices) | Bluetooth 5.4 | In-ear | 8.3 |
| HyperX Cloud Stinger 3 Wireless Gaming Headset | SBC, AAC | 2.4 GHz wireless (USB dongle), Bluetooth 5.2 | Not listed | 8.8 |
Specs from each maker's official page, checked Nov 9, 2026. Spec score formula: methodology.
How we chose
We explain codecs using the Bluetooth SIG's LE Audio pages and Sony's and Qualcomm's official codec pages, then list the codecs each maker states for the headphones in our catalog. Bit rate ratios are our own arithmetic. Research-based, not tested in person. Our methodology.
FAQ
What is the best Bluetooth codec?
It depends on your phone, since a codec only works when both ends support it, so start with what your phone offers.
What is LC3?
It is the codec in Bluetooth LE Audio, which the Bluetooth SIG says matches or slightly beats SBC at less than half the bit rate.
Does LDAC always run at 990 kbps?
No, 990 kbps is its top setting, and Sony compares it with SBC at 328 kbps to get its "about three times" figure.
Is aptX Adaptive fixed quality?
No, Qualcomm designed it to adjust dynamically, and it is backward compatible with aptX and aptX HD devices.
Sources
- Bluetooth SIG: LE Audio FAQs (LC3) (opens in a new tab)
- Sony: LDAC site for end users (opens in a new tab)
- Qualcomm: aptX audio technologies (opens in a new tab)
- Sony WH-1000XM6: Sony official specs (opens in a new tab)
- Sony WF-1000XM5: Sony official specs (opens in a new tab)
- Sony WH-1000XM5: Sony official specs (opens in a new tab)
- Soundcore Liberty 4 NC: Soundcore official specs (opens in a new tab)
- Bose QuietComfort Ultra Headphones (2nd Gen): Bose official specs (opens in a new tab)
- Samsung Galaxy Buds3 Pro: Samsung official specs (opens in a new tab)
- HyperX Cloud Stinger 3 Wireless Gaming Headset: HyperX official specs (opens in a new tab)
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