【 Weak current College 】 what is power amplifier line amplifier for main performance indicators---Power By 【 China power house network 】

Amplifier commonly known as "amplifiers" his role was to come from the sources or the front-stage amplifier of weak signal amplification, the promotion of sound-sound. A good sound system power amplifier's role. Power amplifier is the sound system in the most basic of equipment, its task is to come from the signal source (professional audio systems from mixer) to zoom in for weak signal to drive the speakers sound. In accordance with the use of different components, power amplifier and "danji" [tube amplifier], "Stoner" [transistor amplifier], the "IC amplifier" [IC amplifier]. In recent years because of new technologies, new concepts in danji, makes this old vacuum tube devices also in Germany, it's beautiful voice, many shaoyou admirers. Experienced enthusiasts almost all have a terrace. "IC amplifier" because his tone is not comparable with the two amplifier so HI-FI amplifier rarely saw his shadow. Amplifier generally can be divided into three main categories of "amplifier" and "civil power amplifier," "special amplifier". "Amplifier" is typically used for conferences, concerts, theatre, Church, farm, Museum of the loudspeaker. Designed to output power, protection circuit, good heat dissipation. Most "amplifier" sound replay for HI-FI, sound, dry and hard not resistant to listen. "Civil power amplifier breakdown" and "HI-FI amplifier" "AV amplifier," "KALAOK amplifier" and the various common feature set in one of the so-called "integrated amplifier". "HI-FI amplifier" is our enthusiasts amplifier, its output power General most 2X150 Watts the following. Designed to "tone is exquisite, high-fidelity". Various high-tech embodied in this amplifier. The price is $ from thousands to tens, etc. "HI-FI amplifier" and "split" [the former level amplifier independent], and "merge" [to the fore and back machine into one]. Generally speaking, in the same grade of models "split" in signal to noise ratio, reliability indicators such as channel segmentation than "merge machines" [absolute]. And easy-to-signal wire code. Merge-machine is easy to use, the advantages of a relative low cost, cheap combined machine output power most of the design in General and 2X100W following, many manufacturers to produce more than high-end merge 2X100W. "AV" amplifier is running out of a horse, with large screen TV, and a variety of image carriers universal, "sitting at home watching the film" demand growing, so set a variety of audio and video features in one multifunction amplifier came into being. "AV" is English, audio, video AODIOVIDIO's begin with a letter abbreviation. "AV amplifier," from birth until now, has undergone a Dolby Surround, Dolby, directional logic, DTS AC-3, AV amplifier and the difference between ordinary power amplifier is AV amplifier with AV select Dolby directional logic decoder, DTS decoder, AC-3, and five-channel power amplifier. And the finishing touch of digital sound field [DSP] circuit, for a variety of programs play a different sound field effect. However, due to AV amplifier in the circuit of signal circulation, after a long and complex processing circuit, the purity of the sound was "excessive" dyeing ", so use AV amplifier compatible with HI-FI replay is not ideal. This is a lot of HI-FI enthusiasts on AV amplifier unlikely a Gu. "KALAOK amplifier" is also grown in recent years, a power amplifier. Its general power amplifier differ "KALAOK amplifier" reverberator BBD simulation from the past to the present reverb DIGETAL digital reverb], diminutive device, microphone amplifier. In recent years a number of manufacturers to market demand, including AV amplifier, KALAOK amplifier, various functions into one that is, the so-called "integrated amplifier", this is a hybrid amplifier, nothing, nothing to do, is a rural resist power amplifier. "Special amplifier" as the name implies, is used in the special occasion of power amplifiers, e.g. alarm, auto-voltage power amplifier, and so on, are no longer in this introduction. Power amplifier for main performance indicators: power amplifier main performance indicators have output power, frequency response, distortion, Snr, output impedance, damping coefficients, etc. Output power: units of W, because the manufacturers of measuring methods, so there are some names different name. For example the rated output power, Max output power, output power music, peak output power of music. Music power: mean output distortion does not exceed the specified value, the power amplifier on the music signal instant maximum output power. Peak power: refers to the condition without distortion, amplifier's volume to the maximum, the amplifier's output for maximum music power. Rated output power: when harmonic distortion for 10% of the average output power. Also called maximum useful power. Generally, peak power is greater than the power of music, the music more than rated power, generally speaking peak power is the rated power of 58 times. Frequency response: indicates that the power amplifier frequency range, and frequency range not uniformity. Frequency response curve of flat or not usually expressed in decibels [db]. Home HI-FI amplifier frequency response usually 20HZ20KHZ and negative 1db. this range is wide, the better. Some of the best amplifier frequency response already done 0100KHZ. Distortion: the ideal amplifier should be put after the input signal amplification, no change of faithfully restored. However, for various reasons the power amplifier is enlarged by signal is compared with the input signal, often have a different degree of distortion, this distortion is distorted. Use a percentage, its value as small as possible. HI-FI amplifier distortion at 0 of the total. 03% 0. 05%. Amplifier distortion with harmonic distortion, intermodulation distortion, crossover distortion, clipping distortion, transient distortion, transient intermodulation distortion, etc. SNR: refers to the power amplifier output of various noise level and the ratio of the signal level, db, the higher the value, the better. General Home HI-FI amplifier of signal to noise ratio in more than 60db. Output impedance: pair of speakers the equivalent resistance, called output impedance.