This answer applies to R1 Mk3 R1 Mk2 R2 Mk3 R2i Mk2 R4 Mk3 R4i Mk2 R5 Mk1 R7 Mk1 / Mk2 R7 Mk3
This is because digital and analogue signals are broadcast in different ways. Analogue signals are transmitted direct, but digital signals are digitised before being transmitted and are then processed again before being turned back into sound. This processing adds a slight delay compared to analogue devices.
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