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Understanding The Frequency Response Term Of Modern Power Amplifiers


One often found spec is the frequency response. You may not understand fully the way in which the frequency response is calculated. I will explain what exactly this particular expression means. An amp is created to enlarge a music signal sufficiently to drive some loudspeakers to moderate or higher volume. Suppliers typically publish the frequency range over which the amp operates. The standard convention is to present the frequency range inside which the amplification will decrease no more than 3 dB from the nominal gain. This kind of graph will show if there are any kind of major peaks or valleys inside the working frequency range. You may additionally want to demand a phase response diagram that offers vital clues in regards to the quality of sound.

The lower the speaker impedance the higher the burden for the amplifier. The frequency response of Class-D mini amps shows the greatest change with different speaker loads due to the built-in lowpass filter that removes switching noise from the amplifier’s signal. A varying loudspeaker load will impact the filter response to some amount. In addition, the linearity of the amplifier gain is going to be determined by the load. If not designed adequately, this method may cause instability of the amplifier however. Every output was created to attach a different speaker load.

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