The SBC codec (Low Complexity Subband Codec) remains the mandatory and default Bluetooth audio codec as of 2025 for devices supporting A2DP (Advanced Audio Distribution Profile). It was designed to balance reasonable audio quality with low computational complexity and bandwidth limitations typical in Bluetooth audio transmission. SBC supports up to 48 kHz sampling frequency, uses 4 or 8 subbands, and can handle bitrates up to 320 kbps for mono and 512 kbps for stereo streams. It divides the audio signal into multiple frequency bands and encodes each independently, allowing universal compatibility but resulting in significant compression and some audio quality loss compared to more advanced codecs [11] [13].
In 2025, SBC continues to be widespread especially in devices that do not implement higher-quality or proprietary codecs like aptX, LDAC, or AAC. However, newer codecs such as LC3 (used in LE Audio introduced with Bluetooth 5.2) are starting to succeed SBC for improved sound quality and efficiency, especially in newer Bluetooth standards [13] [14]. The Bluetooth SIG is currently focusing on features like Auracast and LE Audio for 2025 enhancements, but SBC’s simple, universal nature keeps it relevant as a baseline codec [14].
In summary:
- SBC is the default, mandatory codec for Bluetooth audio devices supporting A2DP in 2025.
- It offers reasonable quality at medium bitrates (up to ~320 kbps).
- SBC has low computational complexity and broad compatibility.
- It is increasingly complemented or superseded by newer codecs like LC3 in newer Bluetooth standards (Bluetooth 5.2 and beyond).
- SBC is not lossless and generally understood as a “lowest common denominator” codec compared to aptX and LDAC which offer better audio quality [11] [13] [14].
If you want to know more about SBC’s role or new developments in Bluetooth audio codecs for 2025, I can provide further details.