The frequency response is probably the most often found parameter to characterize stereo amps. On the other hand, it may often be misleading and might not always give a good sign of the sound quality. I am going to shed light on the meaning of this phrase and also offer a few recommendations on how to interpret it while looking for an amplifier.
An amplifier is built to amplify a sound signal enough in order to drive a set of loudspeakers to medium or higher volume level. Makers typically present the frequency range over which the amp works. Generally a lower and upper frequency are provided, like 20 Hz - 20 kHz. This particular specification indicates that the amp will be able to amplify audio inside of this frequency range. Yet, there is far more to understanding the amplifier's functionality than simply considering these numbers. The reality is, an amp with a frequency response from 10 Hz to 30 kHz might actually have much lesser sound quality than an amplifier that has a frequency response from 20 Hz to 15 kHz. Different makers seem to utilize different ways in order to define frequency response. The most widely used method is to describe the frequency response as the frequency range within which the amplifier has fairly constant gain having a highest decrease of 3 decibel (dB). Usually the drop in gain is greatest at the upper and lower frequency.
Seems like there are various ways which suppliers make use of while specifying the frequency response. The most widely used technique is to describe the frequency response as the frequency range within which the amp has quite constant gain with a maximum drop of 3 decibel (dB). Ordinarily the drop in gain is highest at the lower and upper frequency. Then again, a number of producers push this standard to the limit and may show an upper frequency where the amp is going to hardly create a signal any more. In addition, just considering these 2 numbers does not say a lot concerning the linearity of the frequency response. A full frequency response graph, however, will demonstrate if there are any kind of peaks and valleys and in addition show how the frequency response is to be understood. You might also wish to demand a phase response diagram that also gives crucial clues in regards to the sound quality.
This change is most obvious with most digital amplifiers, also called Class-D amps. Class-D amplifiers have a lowpass filter in their output in order to reduce the switching components that are produced by the internal power FETs. The lowpass filter characteristic, on the other hand, greatly is dependent upon the connected load.
Several amplifier topologies offer a method to compensate for variations in the amplifier gain with different speaker loads. One of these methods employs feedback. The amplifier output signal following the internal lowpass is input to the amplifier input for comparison. If not created correctly, this approach might result in instability of the amp however. An additional approach is to offer dedicated outputs for different loudspeaker impedances which are attached to the amp power stage via audio transformers.
An amplifier is built to amplify a sound signal enough in order to drive a set of loudspeakers to medium or higher volume level. Makers typically present the frequency range over which the amp works. Generally a lower and upper frequency are provided, like 20 Hz - 20 kHz. This particular specification indicates that the amp will be able to amplify audio inside of this frequency range. Yet, there is far more to understanding the amplifier's functionality than simply considering these numbers. The reality is, an amp with a frequency response from 10 Hz to 30 kHz might actually have much lesser sound quality than an amplifier that has a frequency response from 20 Hz to 15 kHz. Different makers seem to utilize different ways in order to define frequency response. The most widely used method is to describe the frequency response as the frequency range within which the amplifier has fairly constant gain having a highest decrease of 3 decibel (dB). Usually the drop in gain is greatest at the upper and lower frequency.
Seems like there are various ways which suppliers make use of while specifying the frequency response. The most widely used technique is to describe the frequency response as the frequency range within which the amp has quite constant gain with a maximum drop of 3 decibel (dB). Ordinarily the drop in gain is highest at the lower and upper frequency. Then again, a number of producers push this standard to the limit and may show an upper frequency where the amp is going to hardly create a signal any more. In addition, just considering these 2 numbers does not say a lot concerning the linearity of the frequency response. A full frequency response graph, however, will demonstrate if there are any kind of peaks and valleys and in addition show how the frequency response is to be understood. You might also wish to demand a phase response diagram that also gives crucial clues in regards to the sound quality.
This change is most obvious with most digital amplifiers, also called Class-D amps. Class-D amplifiers have a lowpass filter in their output in order to reduce the switching components that are produced by the internal power FETs. The lowpass filter characteristic, on the other hand, greatly is dependent upon the connected load.
Several amplifier topologies offer a method to compensate for variations in the amplifier gain with different speaker loads. One of these methods employs feedback. The amplifier output signal following the internal lowpass is input to the amplifier input for comparison. If not created correctly, this approach might result in instability of the amp however. An additional approach is to offer dedicated outputs for different loudspeaker impedances which are attached to the amp power stage via audio transformers.
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