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Parallel Circuit - A circuit configuration in which the same voltage
is applied to all components, with current divided among the components
according to their respective resistances or impedances.
Example: All positive leads of two or more speakers
connected together and all negative leads connected together.
Parametric - A type of equilizer with adjustable parameters
such as center frequency and bandwidth (Q) as well as amplitude.
Phase - The relative position of two sound waves with
respect to each other.
Photo Detector (photo diode) - A semiconductor decvice which
provides variations in cyrrent as a function of light intensity.
Piezo Electric Tweeter - A very efficient, highly directional tweeter
which operates without a crossover or magnet. Driver creates sound when a
quartz crystal receives electrical energy.
Pink Noise - Sound with all frequencies perceptible to the human
ear reduced to an equal energy level.
Pink Noise Generator - A device used to generate pink noise that
usaually includes a calibrated microphone.
Pit - One of the depressions that represents data in a compact disc.
May also be refered to as bumps, this is what the pick up sees.
Plate Speaker - A speaker that has two drivers mounted side by side on a flat surface.
Polarity - The electrical quality of having two opposite poles, one positive and
one negative. Polarity determines the direction in which a current tends to flow.
Pole Mount - A common automotive speaker design with the high frequency
driver mounted on a center pole. Newer designs mount the high frequency driver in the
same location above the lower frequency driver with a bridge. This prevents problems
such as dust and dirt from entering at the base of the pole.
Power Handling Capability - The maximum amount of power that can be
safely accommodated without damage in a speaker system. This will vary depending
on frequency and length of time the signal is applied.
Pre-amplifier (pre-amp) - The circuit which takes a small signal and amplifies it to be
fed into the power amplifier for further amplification. Contains controls for volume,
regulating tone, and channel balance.
Pre-amp Fader - A circuit that allows effective level control of two amplifiers,
built in and external without loss of power.
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