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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. |
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Parametric - A type of equalizer with adjustable parameters
such as center frequency and bandwidth (Q) as well as amplitude. |
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Peta (P) - A prefix meaning 1015 or 1,000,000,000,000,000 |
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Phase - The relative position of two sound waves with
respect to each other. |
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Photo Detector (photo diode) - A semiconductor device
which provides variations in current as a function of light intensity. |
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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. |
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Pink Noise - Sound with all frequencies perceptible
to the human ear reduced to an equal energy level. |
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Pink Noise Generator - A device used to generate pink
noise that usually includes a calibrated microphone. |
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Pit - One of the depressions that represents data in
a compact disc. May also be referred to as bumps, this is what
the pick up sees. |
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Plate Speaker - A speaker that has two drivers mounted
side by side on a flat surface. |
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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. |
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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. |
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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. |
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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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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. |
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