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[simoncn]

A digital signal doesn't send 1s and 0s over the wire. It sends a very high-frequency analogue signal that encodes the 1s and 0s as varying voltages. The clocking accuracy of this analogue signal has some tolerance for receiving the digital information correctly. If anything bad does happen, the streaming protocol detects this and requests retransmission.

Although the quality (clocking accuracy) of this high-frequency analogue signal doesn't affect the correctness of the digital data transmitted, a poorer quality signal can create electrical noise in the receiver's circuitry and this can affect sound quality.