Getting To Know The Frequency Response Specification Of The Latest Stereo AmplifiersWhen choosing a new amplifier, you probably are going to take a look at the technical features. An often found parameter is the frequency response. This specification whilst important doesn't tell the full story pertaining to how great the amp is going to sound. In order to help you make a smarter purchasing decision, I'll clarify what this specification means and how to understand it. This hopefully is going to make sure you'll get the ideal amplifier for your project. An amplifier is meant to enlarge an audio signal sufficiently in order to drive some audio speakers to medium or large volume. Suppliers usually present the frequency range over which the amp works. If the frequency range is 20 Hz to 20 kHz for example, the amplifier can amplify all signals with a frequency greater than 20 Hz and less than 20 kHz. It might seem the larger the frequency response the better the amp. That, on the other hand, will not always be the case. You should check out the specs much more closely to be able to correctly understand them all. It seems like there are many different methods which manufacturers use when specifying the frequency response. The conventional convention is to present the frequency range inside of which the gain is going to decrease at most 3 dB from the nominal gain.
Yet, the frequency response commonly is used in order to misinform buyers by stretching out the frequency range a great deal past the range where the amp still works properly and in addition conceals the fact that the amplifier isn't linear. Hence it is best to have a full frequency response graph. Such a graph is going to show whether there are any sort of considerable peaks and / or valleys within the working frequency range. Peaks along with valleys may cause colorization of the audio. If possible the amplifier ought to have a constant amplification within the complete frequency response apart from the drop off at the lower and upper limit. Apart from the frequency response, a phase response diagram may also tell a good deal in regards to the performance and also sound quality of the amplifier.
You furthermore want to look at the circumstances under which the frequency response was measured. You normally won't find any kind of information about the measurement conditions, unfortunately, in the maker's data sheet. One condition which may effect the frequency response is the impedance of the loudspeaker connected to the amp. Standard loudspeaker impedances range from 2 to 16 Ohms. The lower the speaker impedance the higher the strain for the amp.
The frequency response of Class-D amps shows the greatest change with different speaker loads because of the integrated lowpass filter that eliminates switching noise from the amplifier's signal. Then again, the frequency response of the amp now is dependent upon the loudspeaker load considering that the behavior of this lowpass filter is influenced by the load impedance. Usually the lower the speaker load impedance the lower the upper cut-off frequency of the amp
A few of the most recent digital amps feed back the music signal after the lowpass filter so as to compensate for this drawback and also to make the frequency response of the amplifier independent of the connected load. Then again, if the amp is not designed properly, this kind of feedback might cause instability here and also bring about loud noise being created by the amplifier if certain loudspeakers are connected. Other amps make use of transformers and offer outputs for different speaker loads. Aside from improving the frequency response of the amp, this technique normally furthermore enhances the amplifier power efficiency.