In other words, what is the difference in the output signal of the device to the receive/output signal of the speaker when a sound is played via bluetooth and via an aux cord.
In: Engineering
A big difference is that Aux cable is better in quality (of course also depending on quality and length of cable).
With a wireless Bluetooth signal, the audio is compressed when sent and later decompressed when received. This results in a (slight) loss of data and thus of audio quality. You need good speakers to really hear the difference though.
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