Recent power amps are digital amplifiers

On the other hand, after this initial selection, you are going to still have numerous products to choose from. A technique in order to accomplish a straightforward check of the noise performance of an amp is to short circuit the amplifier input and then to crank up the amplifier to its utmost. This noise is created by the amplifier itself. Make certain that the volume of the amplifiers is set to the same amount. Otherwise you will not be able to objectively evaluate the amount of hiss between several amps. The general rule is: the smaller the amount of hiss that you hear the better the noise performance.

Simply put, the larger the signal-to-noise ratio, the smaller the level of noise the amplifier produces. The majority of recent power amps are digital amplifiers, also called “class-d mini audio amps“. Class-D amps use a switching stage which oscillates at a frequency between 300 kHz to 1 MHz. This noise component, however, is generally impossible to hear as it is well above 20 kHz. Signal-to-noise ratio is usually only shown within the range of 20 Hz to 20 kHz. Then the noise-floor energy is measured in the frequency range between 20 Hz and 20 kHz and compared with the full scale signal energy. Often you will find the expression “dBA” or “a-weighted” in your amp parameter sheet. This technique was designed with the knowledge that human hearing perceives noise at different frequencies differently. Human hearing is most sensitive to signals around 1 kHz. The A-weighted signal-to-noise ratio is frequently larger than the unweighted ratio and is published in a lot of amplifier parameter sheets.

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