Walk the Walk: Audio and Video Terms

From AAD to Voice Coils (we don't have any "Z" terms yet), this glossary will break-down the alphabet soup and "audiophile-speak." Credit for some terms: TheWhippinpost, Aaron Miller, Audio Concepts

Room acoustics
The sonic signature of a room, the frequencies it emphasizes and damps down.
Tue, 14 Oct, 2014 at 9:11 PM
Round
 High frequency rolloff or dip. Not edgy.
Tue, 14 Oct, 2014 at 9:12 PM
Satellite
 A satellite speaker is usually fairly small, and does not reproduce the lowest frequencies. Usually meant to be used with a woofer or subwoofer.
Tue, 14 Oct, 2014 at 9:12 PM
Sd
The effective piston area of a driver. The effective piston area of a driver.
Tue, 14 Oct, 2014 at 9:12 PM
Sealed enclosure
An air tight enclosure that completely isolates the back wave of the driver from the front. Very tight, defined sound (with Qtc = 0.707) with very good tran...
Tue, 14 Oct, 2014 at 9:13 PM
Seismic
 Very low bass that you feel rather than hear.
Tue, 14 Oct, 2014 at 9:13 PM
Sensitivity
A measurement of how much power is required for a loudspeaker to achieve a certain output level. The general standard used is on-axis SPL (Sound Pressure Le...
Tue, 14 Oct, 2014 at 9:13 PM
Shrill
 Strident, steely.
Tue, 14 Oct, 2014 at 9:14 PM
Sibilant
 "Essy" Exaggerated "s" and "sh" sounds in singing, caused by a rise in the response around 6 to 10 kHz. Often heard on radio.
Tue, 14 Oct, 2014 at 9:14 PM
Signal-to-noise (SN) Ratio
 The range or distance between the noise floor (the noise level of the equipment itself) and the music signal.
Tue, 14 Oct, 2014 at 9:14 PM