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

Opaque Projector
Similar to an overhead projector, with the added unique feature of being able to display three dimensional objects, such as book covers, photographs, and si...
Tue, 14 Oct, 2014 at 2:09 PM
Open
 Sound which has height and "air", relates to clean upper midrange and treble.
Tue, 14 Oct, 2014 at 2:10 PM
Out of Phase
 When speakers are mounted in reverse polarity, i.e., one speaker is wired +/+ and -/- from the amp and the other is wired +/- and -/+. Bass response will b...
Tue, 14 Oct, 2014 at 2:11 PM
Output
The sound level produced by a loudspeaker. The sound level produced by a loudspeaker.
Tue, 14 Oct, 2014 at 2:11 PM
Overload
A condition in which a system is given too high of an input level. A common cause of distortion or product failure.
Tue, 14 Oct, 2014 at 2:12 PM
Overtones
 See Harmonics. 
Tue, 14 Oct, 2014 at 2:12 PM
Pace
 Often assoc. with rhythm, a strong sense of timing and beat.
Tue, 14 Oct, 2014 at 2:12 PM
Passive Crossover
Uses inductors (coils) and capacitors to direct proper frequencies to appropriate drivers. These crossover systems can be simple (First Order = 1 component ...
Tue, 14 Oct, 2014 at 2:13 PM
Passive Radiator
A device that looks just like an ordinary driver, except it has no magnet or voice coil. A passive radiator is usually a highly compliant device, with a sim...
Tue, 14 Oct, 2014 at 2:13 PM
PCM
 Pulse Code Modulation. A means of digital encoding.
Tue, 14 Oct, 2014 at 2:13 PM