Glossary
[ O | P | Q | R | S | T | U | V | W | X | Y | Z | Others ]
8 definitions for P
Passive : A circuit or component which does not amplify the signal. Introduces very little distortion.
Phono stage : Cartridges output signals at much lower levels than CD players and tape decks. Many amps have the extra amplification built-in, but increasing numbers don't, and require an add-on phono amplifier.
PMPO : This term refers to the maximum power output achieved for a speaker system under perfect conditions. PMPO is a controversy term, as many feel it is used as a marketing ploy, since the perfect conditions on which PMPO are based are next to impossible to achieve in a home where the speaker system is set up. The PMPO of a speaker is actually based on the maximum power output in a very small period of time (microseconds). Since no musical note lasts for such a short amount of time this peak performance cannot be reproduced in real usage of the speaker. The PMPO value is often seen listed as "watts PMPO" on product packaging. PMPO is also called peak music power output. The alternative to PMPO is RMS (Root Mean Square), which is an accurate mathematical representation of a speaker's power output, measured over time rather than a few microseconds.
+ Associated link: http://www.webopedia.com/TERM/P/PMPO.html
Power amplifier : Supplies audio signals to the loudspeakers.
Power handling : The maximum safe power for speakers. But be aware that it's easier to damage speakers with an amp of too low power driven hard, than with too much power.
Preamplifier : The control part of an amp. Built into integrated amps, but can be separate and then needs to be used with power amp or active speakers.
Progressive Scan : Conventional TV pictures are made up of two fields, each one comprising alternate lines of the 625 used to make up a PAL TV picture or the 525 used in NTSC. Your eye is fooled into seeing a whole picture by the speed of the scanning. Progressive scan improves picture quality by scanning the whole field in one hit, not just half of the lines at a time, but to take advantage of this you need a video source - usually a DVD player - and a display device such as a TV or projector - capable of supporting this system. Progressive scan is currently only really relevant with NTSC signals, but work is being done to apply it to the British PAL TV system too.
[ O | P | Q | R | S | T | U | V | W | X | Y | Z | Others ]
