It is easy to be bewildered by the language which amp makers utilize to depict the performance of their products. I will explain the meaning of one usually utilized amplifier specification: "signal-to-noise ratio" in order to help you make an informed decision when buying a brand new amplifier. Whilst trying to find an amplifier, you initially are going to check the cost, power amongst other essential criteria. Yet, after this initial choice, you are going to still have numerous types to choose from. Next you are going to concentrate more on several of the technical specifications, like signal-to-noise ratio and harmonic distortion. Each amp will produce a certain amount of hiss as well as hum. The signal-to-noise ratio will help quantify the level of noise produced by the amp.
After you have narrowed down your search by glancing at some basic criteria, such as the amount of output wattage, the dimensions of the amp as well as the cost, you are going to still have quite a few models to choose from. Now it is time to take a look at some of the technical specifications in more detail. The signal-to-noise ratio is a fairly key parameter and describes how much noise or hiss the amplifier creates.
Whilst looking at the amplifier specification sheet, you want to look for an amplifier with a high signal-to-noise ratio number which indicates that the amplifier outputs a small amount of noise. There are numerous reasons why power amplifiers will add some form of hiss or other unwanted signal. Transistors and resistors that are part of each modern amplifier by nature produce noise. The overall noise depends on how much hiss every component creates. Nonetheless, the location of those elements is also significant. Components that are part of the amplifier input stage are going to generally contribute the majority of the noise.
The majority of recent power amps include a power switching stage which switches at a frequency around 500 kHz. This switching frequency is also noise which is part of the amplified signal. However, recent amplifier specs usually only consider the noise between 20 Hz and 20 kHz.
Most recent power amps incorporate a wattage switching stage that switches at a frequency around 500 kHz. Consequently, the output signal of switching amps have a moderately big amount of switching noise. This noise component, though, is usually impossible to hear since it is well above 20 kHz. However, it can still contribute to speaker distortion. Signal-to-noise ratio is typically only shown within the range of 20 Hz to 20 kHz. Consequently, a lowpass filter is utilized while measuring switching amps to eliminate the switching noise. The most common technique for measuring the signal-to-noise ratio is to set the amplifier to a gain that allows the maximum output swing. Subsequently a test tone is input to the amplifier. The frequency of this tone is usually 1 kHz. The amplitude of this tone is 60 dB underneath the full scale signal. After that the noise-floor energy is calculated in the frequency range between 20 Hz and 20 kHz and compared with the full scale signal energy.
Frequently the signal-to-noise ratio is expressed in a more subjective method as "dbA" or "A weighted". This method tries to evaluate in how far the amp noise is perceived by human hearing which is most sensitive to signals at frequencies at 1 kHz. The A-weighted signal-to-noise ratio is typically higher than the unweighted ratio and is published in most amp parameter sheets.
After you have narrowed down your search by glancing at some basic criteria, such as the amount of output wattage, the dimensions of the amp as well as the cost, you are going to still have quite a few models to choose from. Now it is time to take a look at some of the technical specifications in more detail. The signal-to-noise ratio is a fairly key parameter and describes how much noise or hiss the amplifier creates.
Whilst looking at the amplifier specification sheet, you want to look for an amplifier with a high signal-to-noise ratio number which indicates that the amplifier outputs a small amount of noise. There are numerous reasons why power amplifiers will add some form of hiss or other unwanted signal. Transistors and resistors that are part of each modern amplifier by nature produce noise. The overall noise depends on how much hiss every component creates. Nonetheless, the location of those elements is also significant. Components that are part of the amplifier input stage are going to generally contribute the majority of the noise.
The majority of recent power amps include a power switching stage which switches at a frequency around 500 kHz. This switching frequency is also noise which is part of the amplified signal. However, recent amplifier specs usually only consider the noise between 20 Hz and 20 kHz.
Most recent power amps incorporate a wattage switching stage that switches at a frequency around 500 kHz. Consequently, the output signal of switching amps have a moderately big amount of switching noise. This noise component, though, is usually impossible to hear since it is well above 20 kHz. However, it can still contribute to speaker distortion. Signal-to-noise ratio is typically only shown within the range of 20 Hz to 20 kHz. Consequently, a lowpass filter is utilized while measuring switching amps to eliminate the switching noise. The most common technique for measuring the signal-to-noise ratio is to set the amplifier to a gain that allows the maximum output swing. Subsequently a test tone is input to the amplifier. The frequency of this tone is usually 1 kHz. The amplitude of this tone is 60 dB underneath the full scale signal. After that the noise-floor energy is calculated in the frequency range between 20 Hz and 20 kHz and compared with the full scale signal energy.
Frequently the signal-to-noise ratio is expressed in a more subjective method as "dbA" or "A weighted". This method tries to evaluate in how far the amp noise is perceived by human hearing which is most sensitive to signals at frequencies at 1 kHz. The A-weighted signal-to-noise ratio is typically higher than the unweighted ratio and is published in most amp parameter sheets.
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