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Sabine -
Unit of measurement for
absorption. One sabine is equal
to the absorption of 1 square
foot of surface which will absorb
all incident energy. |
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Sampling
- Measuring the analog signal at
a fixed rate of speed (sampling
frequency). |
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Sealed
Enclosure - A type of speaker
enclosure that does not allow the
pressure generated by the back
wave of the speaker to leave the
enclosure. |
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Selectivity
(alternate channel) - Similar
to capture ratio, but deals with
signals which are broadcast on
frequencies very close to the one
selected. |
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Sensitivity
(loudspeaker sensitivity) -
The sound pressure level a
speaker produces when fed by a
given input power, measured at a
specific distance on axis
directly in front of the speaker.
Typically specified in dB SPL at
1 meter with 1 watt of input
signal. |
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Separates
- A speaker system with more than
one type of driver. The most
common type of separates system
is a set containing two high
frequency drivers (tweeters), two
lower frequency drivers (mids or
woofers), and two crossover
networks (filters). |
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Separation
- The degree to which left and
right channels in a stereo signal
can be kept apart. |
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Series
Circuit - A circuit
configuration in which a single
current path is arranged among
all components. Connecting the
positive speaker output of an
amplifier channel to the positive
terminal of speaker # 1 ,
connecting the negative terminal
of # 1 to the positive terminal
of speaker # 2, and the negative
terminal of # 2 to the negative
output of the same amplifier
channel is a series connection. |
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Shield -
A metallic foil or braided wire
layer surrounding conductors
which is designed to prevent
electrostatic or electromagnetic
interference from external
sources. |
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Signal -
Any electrical transmittance that
conveys data. |
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Signal-to-Noise
Ratio (S/N) - The ratio of
the desired signal level to the
level of unwanted noise. Measured
in decibels.
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Slope -
The rate of boost or attenuation
expressed in decibels of change
per octave. |
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Sound - A
wave propagated in air producing
an auditory sensation in the ear
by the change of pressure at the
ear. |
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Sound Field
- The total acoustical
characteristics of a space, such
as ambience [number, timing, and
relative level of reflections
(ratio of direct to reflected
sound)]. |
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Sound
Pressure Level (SPL) - An
acoustic measurement of sound
energy, typically expressed in dB
SPL. |
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Sound Stage
- The area that appears to be
occupied by sonic images. as with
a real stage, a sound stage
should have depth, height, and
width. |
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Speaker -
A transducer which converts
electrical energy into acoustical
energy (sound). |
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Standing
Waves - Created when two
waves in opposite directions
interfere. When a reflected wave
reinforces a reflection of the
original waveform, the sound
waves reinforce themselves,
increasing in altitude. |
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Stereophonic
(stereo) - Consisting of two
or more audio channels in an
audio system during recording and
playback to give a more natural
distribution of sound. |
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Sub Harmonic
- The result of the division of
the fundamental frequency by the
desired number harmonic. The sub
harmonic of 1000 Hz is 500 Hz. |
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Subcode -
Data, other than music, which is
stored on a CD, MD, or other
digital format. Used to indicate
track number, index number, use
of emphasis, and other
information. |
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Sub-woofer
- A loudspeaker made to reproduce
the lowest of audio frequencies,
approx. 25 Hz to 125 Hz. |
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Supertweeter
- A high frequency driver
designed to reproduce very high
frequencies, typically over 10
kHz. |
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