Bluetooth devices connect to each other via Bluetooth audio codecs. Different codecs have different sound qualities and audio delay times. Most Avantree products have incorporated the "aptx low latency" codec for superior stereo quality sound without any noticeable lip-sync delay.
*Important note*
To take advantage of the aptX Low Latency codec, both Bluetooth devices must support the same codec. If one of the devices doesn't support aptX Low Latency, another codec will be used instead (such as aptX, SBC, etc.).
How is the audio delay when using different wireless audio codecs?
Bluetooth Audio Codec | Audio delay |
aptX™ HD (best for music) | ≥ 250ms |
aptX™ Low Latency (best for TV) | ~ 40ms |
aptX™ | ~ 70ms |
aptX™ Adaptive | 50~ 80ms |
FastStream (best for calls & gaming) | ~ 40ms |
SBC (default Bluetooth codec) | ~ 220ms |
LE Audio (LC3) | ~50ms |
LE Audio (aptX Lite) | ~25ms |
LE Audio (Auracast) | 50~ 120ms |
Note: The latency for FastStream is about the same as aptX Low Latency, but the audio quality FastStream is better if you're using your headphones' mic (e.g. for voice calls and gaming), while aptX Low Latency is better in all other situations.
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