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Radio - A head unit that combines a tuner, a preamplifier, and a power-amplifier.
Radio Frequency Interference (RFI) - Electromagnetic waves between the frequencies of 10 KHz and 300 GHz that can affect susceptible systems by conduction through sensor (tape head) or power input lines, and by radiation through space.
Remote Turn On Lead - The lead from the head unit which supplies a signal (12V+) to the "remote turn on" lead of the amplifier turning the amplifier on when the head unit is turned on, and allowing the amplifier to be mounted in a location out of reach of the user. This is NOT
Resistance - The opposition to the flow of AC or DC voltage in an electric current. Measured in ohms
Resistor - An electrical device that resist the flow of electrical current. The higher the value of resistance (measured in ohms) the lower the current will be.
Resonance - Pitch. When you tighten a drum, you raise its resonance.
Resonant Frequency - Frequency at which there is a response peak, due to a specific interaction of inductive and capacitive circuitry in an audio device or system; the frequency at which an object resonates at maximum efficiency.
RMS - Root Mean Square.