Hi everyone,
I’ve noticed that FP4 (A12) has no 48kHz bluetooth audio sampling rate for the most of codecs (except LDAC) while Android default mixer re-samples everything to 48kHz for the most types of audio output methods (except Direct HD). Eventually that means that casual CD-quality audio of 44.1kHz is upsampled to 48kHz by Android mixer and put to A2DP with downsampling back to 44.1kHz (not the best audio conversion according to audiophile forums).
I own another device running LineageOS 18.1 (A11) that has controls for bluetooth sampling rate and also adjusts Android mixer sampling rate automatically to match the output (A2DP in this case).
I don’t have “golden ears” or expensive audio equipment to hear the difference, but for someone that might be annoying.
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