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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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