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29
Passive crossovers 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 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. The volume of sound delivered for a
given electrical input.
Stator. The fixed part forming the reference for
the moving diaphragm in a planar speaker.
THD. The abbreviation for total harmonic
distortion. (See Distortion)
TIM. The abbreviation for transient intermodulation
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 steady-state
condition to another.
Tweeter. A small drive unit designed to
reproduce 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 two-way systems
are not true woofers but are more accurately
described as being mid/bass drivers.
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