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On its own, the SBC codec is not a terrible lossy compression algo, it can provide suitable audio quality for most consumers, and it’s perfectly suited for lower quality, budget Bluetooth headphones. However, for truly discerning ears that have taken the time to store or stream high-quality music files for playback on hi-fi equipment capable of highly detailed audio quality, the limitations of SBC becomes apparent.
A2DP BluetoothThe priority of SBC doesn’t happen to audiophile quality sound, instead it’s designed to be efficient, using less data, less energy and low-latency. In other words, it’s never been SBC’s job to provide you with a high-end listening experience. Instead it’s designed to save bandwidth and the battery life of your wireless devices. SBC is capable of a respectable 328-kbps, that’s about the data-rate required of high-quality 320-bit MP3s. But that doesn’t mean streaming 320-bit MP3s via SBC will yield a pristine listening experience. On the contrary, both MP3 and SBC are lossy compression algorithms. Your MP3 files have already been compressed, uncompressed and then converted to another lossy compression algorithm (SBC) to travel wirelessly through Bluetooth. This is where we run headlong into compounded compression, a doubling of lossy compression algorithms. Compounded compression constitutes a significant compromise in audio quality when compared to listening to the same MP3 file over a pair of headphones that are hard-wired to your playback device.