![]() If the audio source is already compressed in a format like MP3, AAC, or ATRAC, then it doesn’t need to be re-encoded in SBC in order to be broadcast from the source device. ![]() ![]() The system also supports other popular methods of encoding and compressing audio, like MP3 itself. Due to high “lossy” compression in the SBC codec, the reality of the audio quality is considerably lower, somewhere in the range of 256kbit/s. That’s approximately one third the quality of standard CD audio-roughly the equivalent of a high-quality MP3 recording. The recommended sub-band coding (SBC) codec supports up to 345 kilobits per second at 48 kilohertz. The A2DP standard operates in stereo and supports most of the standard audio compression codecs. ![]() My trusty, rusty Motorola s305 Bluetooth headphones from 2009 only support A2DP. Any Bluetooth audio product you purchase-headphones, speakers, mobile phones, laptops-will support A2DP at the very least, whether or not it can also work with aptX. But as one of the oldest parts of the combined Bluetooth specification, A2DP is more or less the default for streaming audio over Bluetooth. A2DP stands for Advanced Audio Distribution Profile, which means-well it doesn’t mean a whole lot in the context of something that’s already streaming audio.
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