Stereo amplifier suppliers typically release the frequency response of their solutions which, unfortunately, will not necessarily show you a lot regarding the sound quality. You might not fully grasp the way in which the frequency response is calculated. I will explain what specifically this expression means. I hope you'll be able to make a much more educated purchasing decision.
An amp is only able to work within the particular frequency range. Any kind of signals just outside of this range will be removed. As such the frequency response offers a crucial clue regarding whether a specific amp might be appropriate for a certain use. If the frequency range is 20 Hz to 20 kHz as an example, the amplifier can amplify all signals with a frequency higher than 20 Hz and lower than 20 kHz. You might be tempted to pick an amp that offers the greatest frequency response. On the other hand, there is more to understanding an amplifier's performance than merely understanding this simple range.
However, several suppliers ignore this particular established practice. They push the lower frequency and higher frequency to where the amp hardly offers any gain. Furthermore, these numbers say next to nothing about precisely how linear the amp is working inside this range. Subsequently it is best to possess a complete frequency response graph. Such a graph will show whether there are any kind of significant peaks or valleys inside the operating frequency range. Peaks as well as valleys can lead to colorization of the audio. Ideally the amplifier ought to have a constant amplification within the whole frequency response except for the drop off at the lower and upper limit. Aside from the frequency response, a phase response chart will also tell a great deal in regards to the performance and also audio quality of the amp. You also may need to look at the circumstances under which the frequency response was measured. You normally won't find any information about the measurement conditions, unfortunately, in the maker's data sheet. The fact is that a large number of amplifiers are going to behave differently with different loudspeaker loads. This is due to the fact that different loudspeaker loads can cause changes to the behavior of the output power stage of the amplifier.
This change is most apparent with many digital amplifiers, otherwise known as Class-D amplifiers. Class-D amps employ a lowpass filter within their output to suppress the switching components which are created from the internal power FETs. Yet, the frequency response of the amplifier now is dependent upon the loudspeaker load considering that the behavior of this lowpass filter is affected by the load impedance. Generally the lower the loudspeaker load impedance the lower the upper cut-off frequency of the amp
A number of the most recent digital amplifiers feed back the audio signal after the lowpass filter in order to compensate for this drawback and also to make the frequency response of the amplifier independent of the attached load. However, if the amp is not constructed properly, this sort of feedback can cause instability and also lead to loud noise being produced by the amp if certain speakers are connected. Another approach is to offer specific outputs for different loudspeaker impedances that are attached to the amp power stage by using audio transformers.
An amp is only able to work within the particular frequency range. Any kind of signals just outside of this range will be removed. As such the frequency response offers a crucial clue regarding whether a specific amp might be appropriate for a certain use. If the frequency range is 20 Hz to 20 kHz as an example, the amplifier can amplify all signals with a frequency higher than 20 Hz and lower than 20 kHz. You might be tempted to pick an amp that offers the greatest frequency response. On the other hand, there is more to understanding an amplifier's performance than merely understanding this simple range.
However, several suppliers ignore this particular established practice. They push the lower frequency and higher frequency to where the amp hardly offers any gain. Furthermore, these numbers say next to nothing about precisely how linear the amp is working inside this range. Subsequently it is best to possess a complete frequency response graph. Such a graph will show whether there are any kind of significant peaks or valleys inside the operating frequency range. Peaks as well as valleys can lead to colorization of the audio. Ideally the amplifier ought to have a constant amplification within the whole frequency response except for the drop off at the lower and upper limit. Aside from the frequency response, a phase response chart will also tell a great deal in regards to the performance and also audio quality of the amp. You also may need to look at the circumstances under which the frequency response was measured. You normally won't find any information about the measurement conditions, unfortunately, in the maker's data sheet. The fact is that a large number of amplifiers are going to behave differently with different loudspeaker loads. This is due to the fact that different loudspeaker loads can cause changes to the behavior of the output power stage of the amplifier.
This change is most apparent with many digital amplifiers, otherwise known as Class-D amplifiers. Class-D amps employ a lowpass filter within their output to suppress the switching components which are created from the internal power FETs. Yet, the frequency response of the amplifier now is dependent upon the loudspeaker load considering that the behavior of this lowpass filter is affected by the load impedance. Generally the lower the loudspeaker load impedance the lower the upper cut-off frequency of the amp
A number of the most recent digital amplifiers feed back the audio signal after the lowpass filter in order to compensate for this drawback and also to make the frequency response of the amplifier independent of the attached load. However, if the amp is not constructed properly, this sort of feedback can cause instability and also lead to loud noise being produced by the amp if certain speakers are connected. Another approach is to offer specific outputs for different loudspeaker impedances that are attached to the amp power stage by using audio transformers.
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