(
SHIT-FIdelity) Terrible audio quality. Compared to stand-alone devices that can cost hundreds or even thousands of dollars, the digital-to-analog conversion (DAC) and amplification circuitry in a smartphone might cost a few cents. Audiophiles listening to MP3 music encoded at 128 Kbps streaming from a phone over a poor Bluetooth connection to a mini-speaker might definitely label that audio quality shit-fi. See
MP3,
Bluetooth audio,
hi-fi and
lo-fi.