The main performance indicators of car audio amplifiers are output power, frequency response, distortion, signal to noise ratio, output impedance, damping coefficient and so on.
Output Power
The unit is W. Since the measurement methods of different manufacturers are different, some names are different. For example, rated output power, maximum output power, music output power, peak music output power.
Music power
It refers to the instantaneous maximum output power of the power amplifier to the music signal under the condition that the output distortion does not exceed the specified value.
Peak power
It refers to the maximum music power that the amplifier can output when the volume of the amplifier is adjusted to the maximum without distortion.
Rated output power
The average output power when the harmonic distortion is 10%. Also called the maximum useful power. Generally speaking, the peak power is greater than the music power, the music power is greater than the rated power, and generally the peak power is 5-8 times the rated power.
Frequency response
Indicates the frequency range of the amplifier and the unevenness in the frequency range. The straightness of the frequency response curve is generally expressed in decibels. The frequency response of household HI-FI amplifiers is generally 20HZ-20KHZ plus or minus 1db. The wider the range, the better. The frequency response of some of the best amplifiers has been 0-100KHZ.
Distortion
The ideal power amplifier should be to faithfully restore the input signal after it has been changed without any change. However, for various reasons, the amplified signal of the power amplifier is compared with the input signal, and different degrees of distortion are often generated. This distortion is distortion. Expressed as a percentage, the smaller the value, the better. The total distortion of the HI-FI amplifier is between 0.03% and 0.05%. The distortion of the power amplifier includes harmonic distortion, intermodulation distortion, cross distortion, clipping distortion, transient distortion, and transient intermodulation distortion.
Signal to noise ratio
Refers to the ratio of the various noise levels of the amplifier output to the signal level, expressed in db, the larger the value, the better. The SNR of the general household HI-FI amplifier is above 60db.
Output impedance
The equivalent internal resistance presented to the speaker is referred to as the output impedance.
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