MartinLogan Center Channel Speaker Logos, User Manual, Page: 19 / 22

Page 19 Logos User's Manual
Midrange Midrange Midrange Midrange Midrange. The middle frequencies
where the ear is the most
sensitive.
Passive crossover Passive crossover
Passive crossover Passive crossover
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 Phase Phase Phase 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 Pink noise
Pink noise Pink noise
Pink noise. A random noise used in
measurements, as it has the
same amount of energy in each
octave.
Polarity Polarity Polarity Polarity Polarity. The condition of being
positive or negative with respect
to some reference point or object.
RMS RMS
RMS RMS
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 Resistance Resistance Resistance 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 Resistor
Resistor Resistor
Resistor. A device used in a circuit
primarily to provide resistance.
Resonance Resonance
Resonance Resonance
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 Sensitivity Sensitivity Sensitivity Sensitivity. Volume of sound deliv-
ered for a given electrical input.
Stator Stator Stator Stator Stator. The fixed part forming the
reference for the moving dia-
phragm in a planar speaker.
THD THD THD THD THD. Abbreviation for total harmonic
distortion. (See Distortion.)
TIM TIM TIM TIM TIM. Abbreviation for transient
intermodulation distortion. (See
Distortion.)
Transducer Transducer
Transducer Transducer
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 Transient Transient Transient Transient. Applies to that which lasts
or stays but a short time. A
change from one steady-state
condition to another.
Tweeter Tweeter Tweeter Tweeter Tweeter. A small drive unit designed
to produce only high frequencies.
Wavelength Wavelength Wavelength Wavelength Wavelength. The distance measured
in the direction of progression of a
wave, from any given point
characterized by the same phase.
White noise White noise
White noise White noise
White noise. A random noise used in
measurements, as it has the
same amount of energy at each
frequency.
Woofer Woofer Woofer Woofer 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.