There is no difference between amplifier and amplifier. The common name of amplifier is "amplifier".
Amplifiers, as the name implies, are machines that amplify sound
There are many kinds of power amplifiers now. They are used in different fields, including AV power amplifier for common household and hi-fi power amplifier for professional grade
According to the power amplifier power amplifier tube in conductive way is different, can be divided into A power amplifier (also known as class A), B power amplifier (also known as class B), the class AB amplifier (also called class AB) and D class amplifier (also known as the class D)
According to the output mode, it can be divided into two categories: fixed-pressure amplifier and fixed-resistance amplifier. In fire engineering, the fire-fighting broadcast amplifier adopts the fixed-pressure output, and the AV amplifier used in our home is the fixed-resistance output.
Main performance indicators:
The main performance indexes of power amplifier include output power, frequency response, distortion degree, signal-to-noise ratio, output impedance, damping coefficient, etc.
Output power: the unit is W, because the measurement methods of various manufacturers are different, so there are some different names. For example, rated output power, maximum output power, music output power, peak music output power.
Parliamentary music power: refers to the instantaneous maximum output power of the amplifier to music signal under the condition that the output distortion degree does not exceed the specified value.
Torque peak power: refers to the maximum music power output of the amplifier when the amplifier volume is set to maximum without distortion.
The average output power at a harmonic distortion of 10%. Also called maximum useful power. In general, music power is greater than rated power. In general, peak power is 5-8 times of rated power.
Transaction frequency response: denotes the frequency range of the amplifier and the inhomogeneity within the frequency range. The flatness of the frequency response curve is generally expressed in decibels [db]. Domestic HI-FI amplifiers generally have a frequency response of 20Hz- 20KHZ plus or minus 1db. The wider the range, the better. Some of the best amplifiers have a frequency response of 0 to 100KHZ.
Derive distortion: the ideal power amplifier should be one that amplifies the input signal and returns unaltered fidelity. However, due to various reasons, compared with the input signal, the amplifier amplifies the signal and often produces different degrees of distortion, which is distortion. In percentage terms, the smaller the better. The total distortion of HI-FI amplifier is between 0.03% and 0.05%. The power amplifier distortion includes harmonic distortion, intermodulation distortion, cross distortion, clipping distortion, transient distortion, and transient intermodulation distortion.
Radar signal to noise ratio: refers to the ratio of signal level to various noise levels output by power amplifier. In db, the larger the value, the better. Generally, the signal - to - noise ratio of HI-FI amplifier is above 60db.
Hf output impedance: the equivalent internal resistance to the loudspeaker, called output impedance.
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