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PPad | Pan_Pot | Parallel | Parallel | Parallel_Wiring | Parametric | Parametric | Parametric_Equalizer | Passive | Passive | Passive_Component | Passive_Crossover | Passive_Radiator | Passive_Radiator | PCM | Pe | Peak | Peak_Power_Handling_(MAX) | Peak_power_rating | Peak-to-Peak_power_rating | Period | Permalloy_Tape_Head | Phase | Phase | Phase | Phase_Cancellation | Phase_Coherence | Phase_Delay | Phase_Distortion | Phase_Linear | Phase_Shift | Phon | Piezo_(Tweeter) | Piezoelectric_Driver | Pink_Noise | Pitch | Planar_Source | Point-Source | Polar_response | Polarity | Polarity | Polarity | Pole_Piece | Polycarbonate | Polypropylene | Port | Port_Diameter | Port_Length | Ported | Ported | Ported_(enclosure) | Ported_Enclosure | Potentiometer | Power | Power_(P) | Power_amplifier | Power_amplifier | Power_factor | Power_Handling_(continuous_or_RMS) | Pre-Amp | Preamp_Output | Preamplifier | Preamplifier | Pre-amplifier | Precedence_Effect | Preset | Program_Bank | Program_Play | Proximity_Effect | Psychoacoustics | Punch | Push-pull | Push-Pull_Configuration |1. Pad 2. Pan Pot:-Short for panoramic potentiometer, this is a knob controlling a voltage divider that can send a signal to a combination of two busses, such as left and right. Always found on mixing consoles to set up (pan) a signal within the stereo field, it is also called a 'balance' control on domestic stereo amplifiers. 3. Parallel 4. Parallel: 5. Parallel Wiring 6. Parametric-A type of equalizer that permits the center frequency, the filter shape, and the amplitude of each band to be varied. (e.g., You should save up for a good parametric equalizer so that you can dump your old 5 band graphic EQ.) 7. Parametric-A type of equalizer that permits the center frequency, the filter shape, and the amplitude of each band to be varied. (e.g., You should save up for a good parametric equalizer so that you can dump your old 5 band graphic EQ.) 8. Parametric Equalizer 9. Passive require external power, but rather uses only basic circuit elements such as capacitors, inductors, and resistors. (e.g., We used two capacitors and one inductor to make a 6 dB/octave passive crossover for our midrange speakers.) 10. Passive:The type of circuitry that does not require external power, but rather uses only basic circuit elements such as capacitors, inductors, and resistors. (e.g., We used two capacitors and one inductor to make a 6 dB/octave passive crossover for our midrange speakers.) 11. Passive Component 12. Passive Crossover 13. Passive Radiator:-Sometimes known as a "drone cone," these passive devices respond to internal pressure within the speaker and react to it to produce reinforcing emissions to extend the output of the lower frequencies below the resonance point of the active woofer. They may look like Drivers but they lack an active motor assembly. 14. Passive Radiator 15. PCM-Pulse Code Modulation. A means of digital encoding. 16. Pe:Driver's rated RMS power handling capability. 17. Peak 18. Peak Power Handling (MAX)-Peak power handling refers to the amount of power a speaker is estimated to handle during a brief high-intensity musical burst. Since this can vary with both frequency and amplitude, it is a much less accurate way to judge speaker durability and performance than RMS (see RMS). 19. Peak power rating 20. Peak-to-Peak power rating: 21. Period 22. Permalloy Tape Head 23. Phase-The relative timing of a sound wave that is measured in degrees from 0 to 360. 24. Phase:-The time relationship between two AC (alternating current) signals. (e.g., In an AC circuit the current and voltage may experience a phase shift.) 25. Phase:-The time relationship between two AC (alternating current) signals. (e.g., In an AC circuit the current and voltage may experience a phase shift.) 26. Phase Cancellation 27. Phase Coherence 28. Phase Delay 29. Phase Distortion:-A type of audible distortion caused by time delay between various parts of the signal. 30. Phase Linear: 31. Phase Shift:The fraction of a complete cycle elapsed as measured from a specified reference point and expressed as an angle. 2. Out of phase in an un-synchronized or un-correlated way. 32. Phon:A unit of apparent loudness, equal in quantum to the intensity in decibels of a 1,000 Hz tone estimated to be as loud as the sound being measured. 33. Piezo (Tweeter):-A tweeter whose motor is simply a crystal of Piezo material through which the signal current flows. The crystal lattice responds to this by bending in proportion to the Amplitude and frequency of the incoming signal. Because it is a high impedance device, it does not need a Crossover in line with the source. Piezo tweeters are very efficient Drivers and are relatively inexpensive. They come in a large variety of designs and radiators. 34. Piezoelectric Driver-This is among the most robust and least expensive alternative drivers for the high frequency reproduction. The material used in the Piezoelectric Driver is a piezoelectric polymer first developed in the early 1960's. This piezoelectric polymer is a plastic-like material that, unlike a crystal, can be made into thin sheets and fashioned into a great variety of shapes. Its transient and high frequency response is very good because the moving mass is negligible. The driver operates by bending the lattices in the crystalline structure of the piezoelectric polymer film. The Piezoelectric Driver is inappropriate for low frequency applications, as it is incapable of large air displacements. This high frequency transducer is very uniform in response from approximately 2 kHz to 20 kHz. It typically is used in many car stereo enclosures and other compact space environments. 35. Pink Noise:-Pink noise is a random noise source characterized by a flat amplitude response per octave band of frequency, i.e., it has equal energy, or constant power, per octave. Pink noise is created by passing white noise through a filter having a 3 dB/octave roll-off rate. Due to this roll-off, pink noise sounds less bright and richer in low frequencies than white noise. Since pink noise has the same energy in each 1/3-octave band, it is the preferred sound source for many acoustical measurements in respect to the critical band concept of human hearing. The name comes from the filtering of white noise. White noise is analogous to white light in that it contains all audible frequencies distributed uniformly throughout the spectrum. Passing white light through a prism (a form of filter) breaks it down into a range of colors. Examination shows that red light is characterized by the longer wavelengths of light, i.e., light in the lower frequency region. Similarly, pink noise has higher energy in the low frequencies, hence the term, pink. 36. Pitch:The subjective sensation produced by various frequencies. The higher the frequency, the higher the perceived pitch; however, frequency is not linearly related to pitch. See also 'Concert Pitch'. 37. Planar Source: 38. Point-Source 39. Polar response:A plot of the Amplitude measurement of a speaker's output at a given frequency relative to an off-axis angle. In other words, the difference that exists between how a speaker sounds when being heard directly in front, compared to how it sounds while standing off to one side. (See Dispersion) 40. Polarity: 41. Polarity:-A speaker, for example, has a positive and a negative input terminal. Connecting a battery directly to the speaker will result in the diaphragm moving outward. If you reverse the battery leads, the diaphragm will move inward. Caution 42. Polarity 43. Pole Piece 44. Polycarbonate:-A polymer based plastic material offering superior resistance against resonance. 45. Polypropylene-A plastic based material used primarily for speaker cones due to its rigidity, damping and resistance against harsh environmental conditions. 46. Port: 47. Port Diameter:The measurement across the port opening. Measured as internal diameter (not outer diameter . 48. Port Length 49. Ported: 50. Ported-A type of bass reflex enclosure design that utilizes a hole, or port, to improve the low-frequency response. (e.g., In most cases a ported enclosure will thump harder than a sealed box, but not over as wide a range of frequencies.) 51. Ported (enclosure):-Any enclosure design with ports. In such designs the internal pressure wave is processed to be used either solely, or in conjunction with the woofer front wave in order to produce sound. A port can be a simple opening, a tube or a Passive Radiator. 52. Ported Enclosure:A type of speaker enclosure that uses a duct or port to improve efficiency at low frequencies. 53. Potentiometer: 54. Power 55. Power (P) 56. Power amplifier:The final stage of amplification. (e.g., You must use a power amplifier to drive your speakers.) 57. Power amplifier:The final stage of amplification. (e.g., You must use a power amplifier to drive your speakers.) 58. Power factor:-The ratio of the total power in watts (resistive load) to the total apparent power in voltamperes (VA) (reactive load). The difference between watts and VA is due to reactive load impedance. Apparent power equals watts only for a purely resistive load (i.e., zero degrees phase shift between the applied voltage and the resultant current). Power factor is best thought of intuitively as the multiplier (ranging between 0 and 1) that you must use to obtain the real power from the apparent power. For example if the rms voltage and current of a circuit is measured and multiplied together, the apparent power is obtained, but this value must be multiplied by the power factor to obtain the real power. If the load is purely resistive then the phase difference between the voltage and current will be zero and the power factor will be one, and the apparent power will equal the true power -- but only for a resistive load. For a reactive load (any load with inductive and/or capacitive reactance, i.e., any real world load) there will be a phase difference between the voltage and the current due to the phase delay introduced by the reactive elements. Simply put, since the maximum voltage and current do not occur at the same instant of time the amount of power developed is less than the measured rms voltage and current multiplied together. 59. Power Handling (continuous or RMS): 60. Pre-Amp:-A circuit unit which takes a small signal and amplifies it sufficiently to be fed into the power amplifier for further amplification. A pre-amp includes all of the controls for regulating tone, volume, and channel balance.2 61. Preamp Output-Typically found on headunits, a preamp output provides low level, high quality audio signal for use with external amplifiers. 62. Preamplifier:The first stage of amplification in which the amplitude of a very low-level audio signal is increased. (e.g., Most car audio decks have four separate preamplifier outputs that correspond to the Front Left, Front Right, Rear Left, and Rear Right channel outputs.) 63. Preamplifier 64. Pre-amplifier:-Or Pre-amp is a device that takes a source signal, such as from a turntable, tape-deck or CD player, and passes this signal on to a power-amplifier(s). The pre-amp may have a number of controls such as source selector switches, balance, volume and possibly tone-controls. 65. Precedence Effect-Also known as the Haas effect, this phenomenon identifies the tendency for the ear to attribute all perceived sound to the nearest emitter, even if a more distant speaker is actually louder. Thus, drums that yield 90 percent or more of their energy in the non-directional lower frequencies are perceived as located in the space created by the tiny amount of higher frequency overtones. It is also for this reason that sounds from the rear speakers of a surround system are delayed by 10 to 30 milliseconds, so that they can be experienced as coming from the rear direction. 66. Preset 67. Program Bank-A Custom File feature that allows the user to flag the tracks on a disc, indicating whether they should be played or skipped. 68. Program Play:A Custom File feature that allows the user to define a sequence of 12 tracks, in a specific order, for customized playback. Up to two banks of 12 track sequences can be recalled, for up to 24 tracks total. 69. Proximity Effect:An increase in the bass response of some microphones as the distance between the mike and its sound source is decreased. 70. Psychoacoustics:-The scientific study of the relationship between human hearing and its stimulus; in other words, how we hear. 71. Punch:Like "hitting hard," a subjective colloquial term that describes the snap or deep impact of the low end response of an audio system 72. Push-pull-Most common type of amplification that amplifies the negative and positive sides of the waveform separately. Allows for much higher power output than single-ended. 73. Push-Pull Configuration-One driver is mounted normally, the second is mounted so that it faces into the enclosure, both sharing the same internal volume and wired out of phase with one another. Although electrically out of phase with one another, the drivers are acoustically in phase since they move in the same direction. This alignment theoretically reduces second order harmonic distortion. |
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