value.
Inductance. The property of an electric circuit by which a varying current in it produces a varying magnetic field that introduces voltages in the same circuit or in a nearby circuit. It is measured in henrys.
Inductor. A device designed primarily to introduce inductance into an electric circuit. Sometimes called a choke or coil.
Linearity. The extent to which any signal handling process is accomplished without amplitude distortion.
Midrange. The middle frequencies where the ear is the most sensitive.
Passive crossover. Uses no active components (transistors, IC’s, tubes) and needs no power supply (AC, DC, battery) to operate. The crossover in a typical loudspeaker is of the passive variety. Passive cross- overs consist of capacitors, inductors and resistors.
Phase. The amount by which one sine wave leads or lags a second wave of the same frequency. The difference is described by the term phase angle. Sine waves in
phase reinforce each other; those out of phase cancel.
Pink noise. A random noise used in measurements, as it has the same amount of energy in each octave.
Polarity. The condition of being positive or negative with respect to some reference point or object.
RMS. Abbreviation for root mean square. The effective value of a given waveform is its RMS value. Acoustic power is proportional to the square of the RMS sound pressure.
Resistance. That property of a conductor by which it opposes the flow of electric current, resulting in the generation of heat in the conducting material, usually expressed in ohms.
Resistor. A device used in a circuit primarily to provide resistance.
Resonance. The effect produced when the natural vibration frequency of a body is greatly amplified by reinforcing vibrations at the same or nearly the same frequency from another body.
Sensitivity. Volume of sound deliv- ered for a given electrical input.
Stator. The fixed part forming the
reference for the moving dia- phragm in a planar speaker.
THD. Abbreviation for total harmonic
distortion. (See Distortion.)
TIM. Abbreviation for transient intermodulation distortion. (See Distortion.)
Transducer. Any of various devices that transmit energy from one system to another, sometimes one that converts the energy in form. Loudspeaker transducers convert electrical energy into mechanical motion.
Transient. Applies to that which lasts or stays but a short time. A change from one
Transmit. To cause sound to pass through air or some other medium.
Tweeter. A small drive unit designed to produce only high frequencies.
Wavelength. The distance measured in the direction of progression of a wave, from any given point characterized by the same phase.
White noise. A random noise used in measurements, as it has the same amount of energy at each frequency.
Woofer. A drive unit operating in the bass frequencies only. Drive units in
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