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Jargon Buster - R

Random/Repeat Play
Applies to CD Players. The disc can be set to play tracks in a random order or to repeat either one track or all tracks.

RDS
Radio Data System. Enables digital display of Radio network information on FM stations including radio station titles. Also allows user to program unit to interrupt with news and traffic bulletins.

RMS
Root Mean Square is the generally recognised way of measuring the power of amplifiers and speakers.