--- title: "LDAC vs aptX vs AAC: Bluetooth Audio Codecs Explained" description: "How the Bluetooth codecs SBC, AAC, aptX, aptX HD, aptX Adaptive and LDAC compare, why your phone decides which one you get, and when the codec matters." url: "https://theaudiostuff.com/glossary/ldac/" type: "article" author: "Jakub Charkiewicz" published: "2026-09-26T00:00:00.000Z" modified: "2026-09-29T00:00:00.000Z" --- > Markdown rendering of https://theaudiostuff.com/glossary/ldac/ > Canonical URL to cite: https://theaudiostuff.com/glossary/ldac/ > Generated from the published page. Text and links only; see the HTML for layout. Breadcrumb: [Home](https://theaudiostuff.com/) > [Glossary](https://theaudiostuff.com/glossary/) > LDAC # LDAC vs aptX vs AAC: how Bluetooth audio codecs compare {#term-title} A Bluetooth codec is the compression a phone uses to send audio over the wireless link to headphones, speakers or a DAC. SBC is the baseline every device supports, AAC is what iPhones use, aptX is Qualcomm's family and LDAC is Sony's high-bitrate codec. Both ends must share a codec, radio conditions decide how much bitrate survives, and the headphone's own tuning usually matters more. - By [Jakub Charkiewicz](https://theaudiostuff.com/authors/jakub-charkiewicz/) - Published Sep 26, 2026 - Updated Sep 29, 2026 - 4 min read ## Glossary definition {#term-define-title} - **LDAC**: Sony's proprietary Bluetooth audio codec supporting up to 990 kbps, the highest available over Bluetooth. Quality depends heavily on signal strength; in clean RF environments LDAC at 990kbps is subjectively transparent. ## Why Bluetooth audio is compressed {#why-bluetooth-audio-is-compressed} Uncompressed CD-quality stereo needs about 1,411 kbps of steady throughput, more than a Bluetooth audio link can hold reliably. So the phone encodes the music, nearly always with a lossy codec, sends the smaller stream, and the headphones decode it before their own [DAC](https://theaudiostuff.com/glossary/dac/) and amplifier play it. Everything you hear from a wireless headphone has passed through that encoder, whatever the file you started with. Two rules decide what you get. Both ends must support a codec for it to be used, so the connection settles on the best one the phone and the headphones have in common. And the higher-bitrate modes need a strong, clean radio link. When the signal weakens, an adaptive codec drops to a lower bitrate, and a fixed one starts to break up. ## SBC, the codec every device shares {#sbc-the-codec-every-device-shares} [SBC](https://theaudiostuff.com/glossary/ldac/#sbc-the-codec-every-device-shares), or Sub-Band Coding, is mandatory in every Bluetooth audio device, so it is what you get when the two ends share nothing better. At its highest standard setting it runs at about 328 kbps and sounds reasonable. Many devices use lower settings, where its compression becomes easier to hear. Cheap devices often stop at SBC because other codecs carry license fees. The review of the $29 [SMSL PS100](https://theaudiostuff.com/reviews/smsl-ps100/) counts its Bluetooth input's lack of better codecs as a con, and puts it down to exactly those licensing costs. ## AAC and the iPhone {#aac-and-the-iphone} [AAC](https://theaudiostuff.com/glossary/ldac/#aac-and-the-iphone) is the codec family behind Apple Music and several streaming services, standardized by ISO/IEC. iPhones and iPads send AAC over Bluetooth at around 256 kbps, and Apple's encoder is good enough that most listeners find it hard to tell from the source on most music. On Android, results vary more with the phone's encoder. iPhones support neither aptX nor [LDAC](https://theaudiostuff.com/glossary/#ldac). Pair one with an LDAC or aptX headphone and the link runs on AAC, so for iPhone owners the AAC support matters more than the headline codec. The [HIFIMAN Svanar Wireless](https://theaudiostuff.com/reviews/hifiman-svanar-wireless/), for example, supports LDAC, AAC and SBC, and would run AAC from an iPhone. ## The aptX family and its versions {#the-aptx-family-and-its-versions} Qualcomm's aptX codecs are common on Android phones, headphones and receivers. Standard aptX carries 16-bit audio at 384 kbps at 48 kHz. [aptX HD](https://theaudiostuff.com/glossary/ldac/#the-aptx-family-and-its-versions) raises that to 24-bit at 576 kbps. [aptX Adaptive](https://theaudiostuff.com/glossary/ldac/#the-aptx-family-and-its-versions) changes its bitrate with radio conditions and adds a low-latency mode for video and games, and the newest Snapdragon Sound devices can carry CD-quality lossless audio when the link allows. The family is only as good as the chips at both ends, so "aptX" on a box needs checking against which version. The [Fosi Audio ZD3](https://theaudiostuff.com/reviews/fosi-audio-zd3/) [DAC](https://theaudiostuff.com/glossary/dac/) lists aptX HD on its Bluetooth input, and the [SMSL RAW-MDA1](https://theaudiostuff.com/reviews/smsl-raw-mda1/) takes LDAC, aptX and aptX HD, SBC and AAC. Its review points out that none of them is lossless. ## LDAC and its three bitrates {#ldac-and-its-three-bitrates} LDAC was developed by Sony and has shipped with Android since version 8. It runs at 330, 660 or 990 kbps, and at 990 kbps it has the highest bitrate of the lossy codecs here, carrying up to 24-bit/96 kHz. It is still lossy at every setting. The [Svanar Wireless](https://theaudiostuff.com/reviews/hifiman-svanar-wireless/) review makes that point and judges it unlikely to be a significant concern with wireless in-ears. Many phones default to an adaptive mode that picks the bitrate for connection stability, so LDAC headphones in a busy street often run far below 990 kbps. Developer settings on most Android phones let you force the highest rate, at some cost in range and battery. The [OneOdio Max 1](https://theaudiostuff.com/reviews/oneodio-max-1/) is a €179 [over-ear](https://theaudiostuff.com/glossary/#over-ear) with LDAC over Bluetooth 5.3, and its review found the wired connection a touch cleaner still. A headphone's wired and wireless modes can run through different electronics, though, so the codec isn't the only thing that changes. ## When the codec makes a difference {#when-the-codec-makes-a-difference} Less often than the marketing suggests. The gap between a good AAC or aptX stream and LDAC is small, and it shows mainly on a resolving headphone, with a good recording, in a quiet place. The tuning of the headphone, its fit and seal, and the processing inside it (EQ, noise canceling, the built-in DAC and amplifier) change the sound more than the codec does. The codec matters most in three cases. The first is when you're stuck on SBC because your phone and headphones share nothing better. The second is latency for video, games or performance, where some products skip Bluetooth: the [Max 1](https://theaudiostuff.com/reviews/oneodio-max-1/)'s DJ mode runs through a separate M1 transmitter at 20 ms. The third is a Bluetooth input on a hi-fi DAC, where the wireless link can be the weakest part of an otherwise good chain. For critical listening a cable remains the only path that is always lossless. The [IEM guide](https://theaudiostuff.com/guides/best-iems/) ranks wired and wireless in-ears side by side, and the [IEM explainer](https://theaudiostuff.com/glossary/iem/) covers how the designs differ. ## Reviewed gear that shows this {#term-products-title} 3 reviews in the catalogue. Each score is set against its own category's reference. - [![A HIFIMAN Svanar Wireless earbud on a purple keyboard, its mirror-chrome body ending in a black silicone tip](https://theaudiostuff.com/images/thumb/hifiman-svanar-wireless-earbud-160.avif) HIFIMAN Svanar Wireless Recommended $499 Score 7.8 out of 10](https://theaudiostuff.com/reviews/hifiman-svanar-wireless/) - [![Fosi Audio ZD3 front panel: the round screen reads 50 on the optical input, beside an orange knob](https://theaudiostuff.com/images/thumb/fosi-audio-zd3-front-panel-160.avif) Fosi Audio ZD3 Recommended $150 Score 7.1 out of 10](https://theaudiostuff.com/reviews/fosi-audio-zd3/) - [![OneOdio Max 1 headband in black leatherette with red edge stitching and an embossed logo, laid on its box](https://theaudiostuff.com/images/thumb/oneodio-max-1-headband-red-stitching-160.avif) OneOdio Max 1 Mixed €179 about $195 Score 7.0 out of 10](https://theaudiostuff.com/reviews/oneodio-max-1/) ## What our reviews say about LDAC {#term-said-title} 4 reviews raise it in their pros and cons: 3 lines credit it and 1 faults it. each quoted as its review states it. - Strength: Bluetooth 5.2 with LDAC support (24-bit/96kHz) - [HIFIMAN Svanar Wireless](https://theaudiostuff.com/reviews/hifiman-svanar-wireless/), 7.8/10 - Flaw: Bluetooth has no fancy codecs - [SMSL PS100](https://theaudiostuff.com/reviews/smsl-ps100/), 7.0/10 - Strength: Bluetooth with aptX HD, not just SBC/AAC - [Fosi Audio ZD3](https://theaudiostuff.com/reviews/fosi-audio-zd3/), 7.1/10 - Strength: Wired and wireless with LDAC + Hi-Res Audio certification - [OneOdio Max 1](https://theaudiostuff.com/reviews/oneodio-max-1/), 7.0/10 ## Put it to use {#term-use-title} - [Buying guide Best IEMs This list ranks the best in-ear monitors for audiophile music listening at every price, from a $30 wired pair with a microphone to a $499 true wireless set. 7 ranked picks, led by the HIFIMAN RE2000 PRO Silver](https://theaudiostuff.com/guides/best-iems/) ## Sources and further reading {#term-sources-title} - [Bluetooth A2DP 1.4: Advanced Audio Distribution Profile](https://www.bluetooth.com/specifications/specs/advanced-audio-distribution-profile-1-4/) Standard Bluetooth Special Interest Group The Bluetooth SIG profile defining high-quality stereo audio streaming, with SBC as its baseline codec. - [ISO/IEC 13818-7: MPEG-2 Advanced Audio Coding (AAC)](https://www.iso.org/standard/43345.html) Standard International Organization for Standardization Paid full text The ISO/IEC standard that specifies MPEG AAC, the lossy codec family the AAC section describes. - [Wikipedia: LDAC (codec)](https://en.wikipedia.org/wiki/LDAC_(codec)) Encyclopedia Wikipedia ## Keep reading {#term-more-title} - ### [IEM](https://theaudiostuff.com/glossary/iem/) In-Ear Monitor, a headphone whose shell seals inside the ear canal instead of covering the ear. - ### [Balanced Armature](https://theaudiostuff.com/glossary/balanced-armature/) A miniature driver used in IEMs where a metal armature pivots between magnets, allowing multiple drivers to be stacked in a very small shell. - ### [Sibilance](https://theaudiostuff.com/glossary/sibilance/) Excessive "s," "sh," and "ts" consonants caused by a peak in the 6-10kHz region; can be a characteristic of the headphone, the recording, or a bright source. - [The full audio glossary](https://theaudiostuff.com/glossary/) - [How we test](https://theaudiostuff.com/about/how-we-test/) Written by ## [Jakub Charkiewicz](https://theaudiostuff.com/authors/jakub-charkiewicz/) {#term-author-title} Founder & lead reviewer Writing for The Audio Stuff since May 2023 [Everything by Jakub](https://theaudiostuff.com/authors/jakub-charkiewicz/) [@TheAudioStuff](https://www.youtube.com/@TheAudioStuff) [LinkedIn](https://www.linkedin.com/in/jakub-charkiewicz) [Report a correction](mailto:contact@theaudiostuff.com?subject=Correction%3A%20LDAC%20explainer&body=Page%3A%20https%3A%2F%2Ftheaudiostuff.com%2Fglossary%2Fldac%2F%0A%0AWhat%20looks%20wrong%2C%20and%20where%20you%20read%20the%20right%20figure%20(if%20you%20have%20a%20source)%3A%0A%0A)