| • |
R - Ripple, in dB |
| • |
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. |
| • |
RAM - Random Access Memory. A memory device that one
can write data to and read data from. |
| • |
Ras - Acoustical equivalent of Rms |
| • |
Re - "This is the DC resistance of the driver measured with an ohm meter and it is often referred to as the 'DCR'. This measurement will almost always be less than the driver's nominal impedance. Consumers sometimes get concerned the Re is less than the published impedance and fear that amplifiers will be overloaded. Due to the fact that the inductance of a speaker rises with a rise in frequency, it is unlikely that the amplifier will often see the DC resistance as its load." |
| • |
Relay (SPDT) - (Single Pole Double Throw Relay)
an electromagnetic switch,
consist of a coil (terminals 85 & 86), 1 common terminal (30), 1 normally closed terminal (87a),
and one normally open terminal (87). |
| • |
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 the amplifier's main source of power. |
| • |
Res - The electrical resistive equivalent of Rms, in ohms |
| • |
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 it's resonance. |
| • |
Resonant Frequency - Frequency at which there is a response peak,
due to a specific interaction of inductive and capacitive circuitry in an audio devise
or system. |
| • |
Revc - DC voice coil resistance, in ohms |
| • |
Revc - DC voice coil resistance, in ohms |
| • |
RF Modulator - A device that converts a signal (typically audio and/or video) into a radio frequency. |
| • |
Rg - Amplifier source resistance (includes leads, crossover, etc.), in ohms |
| • |
Rg - Amplifier source resistance (includes leads, crossover, etc.), in ohms |
| • |
RKE - Remote Keyless Entry |
| • |
RMS - Root Mean Square. |
| • |
Rms - "This parameter represents the mechanical resistance of a driver’s suspension losses. It is a measurement of the absorption qualities of the speaker suspension and is stated in N*sec/m." The driver's mechanical losses, in kg/s |
| • |
Roll-Off - Relates to the attenuation of frequencies, above or below a given point, at a specific rate. |
| • |
ROM - Read Only Memory. A memory device that one can only read data from.
The data has been pre-programed. |
| • |
RS - Remote Starter |
