Bluetooth Audio Codecs: SBC vs AAC vs aptX vs LDAC

By Sarah Okonkwo · October 6, 2026

Why Codec Choice Matters

Bluetooth audio codecs determine how much data reaches your headphones and how it sounds. Different codecs offer vastly different bitrates, latency, and compatibility.

SBC: The Baseline

Sub-Band Coding is mandatory for all Bluetooth audio devices. Maximum bitrate: 328 kbps. Quality varies wildly depending on encoder implementation. Often criticized for poor high-frequency detail, but modern dual-channel SBC at high bitrates is surprisingly competent.

AAC: Apple Standard

Advanced Audio Coding is the default on iPhones and iPads. Bitrate: 256 kbps. Psychoacoustic model is more efficient than SBC, delivering better quality at lower bitrates. Performance depends heavily on the hardware encoder — Android AAC quality varies by device.

aptX and aptX HD

Qualcomm proprietary codecs. aptX: 352 kbps, aptX HD: 576 kbps. Both use time-domain ADPCM rather than perceptual coding, preserving more transient detail. Require Qualcomm chipsets on both ends. aptX Adaptive dynamically adjusts bitrate between 279-420 kbps based on RF conditions.

LDAC: Sony High-Res

Sony developed LDAC for high-resolution audio streaming. Three bitrate modes: 330, 660, and 990 kbps. At 990 kbps, LDAC transmits roughly three times the data of SBC. Available on Android 8.0+ natively. The catch: most devices default to 330 kbps to maintain connection stability.