Bluetooth LE Audio
Bluetooth · 7 specs
Direct Answer
Bluetooth 5.4 and LE Audio represent a complete architectural overhaul of Bluetooth audio and retail IoT. Powered by the Low Complexity Communication Codec (LC3), Isochronous Channels, Auracast broadcast audio, and Periodic Advertising with Responses (PAwR), it delivers superior audio quality at half the bitrate and supports multi-thousand device Electronic Shelf Label (ESL) networks.
Source: Bluetooth SIG Core Specification v5.4 / LE Audio & Auracast Specs · Last reviewed Aug 28, 2026
Specs
| Bluetooth Version | v5.4 (2023) / LE Audio Architecture |
| Standard Audio Codec | LC3 (Low Complexity Communication Codec) |
| Audio Bitrates Supported | 160 kbps (High quality) down to 32 kbps (Speech) |
| Broadcast Audio Standard | Auracast (Unlimited simultaneous listener sinks) |
| Multi-Stream Audio | True independent left/right earbud streams |
| PAwR Capability | Periodic Advertising with Responses (Sub-event bidirectional polling) |
| Encrypted Advertising Data | EAD (Standardized payload encryption) |
LC3 Codec and True Multi-Stream Audio
LE Audio replaces the 20-year-old SBC codec with LC3. Listening tests conducted using ITU-R BS.1116-style methodology found that LC3 operating at 160 kbps was rated with comparable or higher subjective audio fidelity than SBC at 345 kbps, while dramatically reducing latency to 20–30 ms.
Furthermore, LE Audio natively supports True Multi-Stream Audio, allowing a source to transmit synchronized independent streams to left and right earbuds without master-slave relay hacks.
Auracast Broadcast and PAwR IoT Scaling
- Auracast: Enables an audio source (TV in a public gym, airport gate, or theater) to broadcast unencrypted or PIN-protected audio to an unlimited number of in-range Auracast hearing aids and earbuds.
- PAwR (v5.4): Introduced Periodic Advertising with Responses, enabling thousands of battery-powered Electronic Shelf Labels (ESLs) in retail stores to receive price updates and transmit status confirmations over synchronized micro-timeslots with 5+ year battery life.