I am going to clarify the meaning of a commonly utilized amp spec: “signal-to-noise ratio” to help you make an informed choice while purchasing a new amplifier.
Next you will focus more on some of the technical specs, like signal-to-noise ratio as well as harmonic distortion. The signal-to-noise ratio is a rather important specification and describes how much noise or hiss the amplifier produces.
Next listen to the speaker which you have connected. On the other hand, bear in mind that you must set all amplifiers to amplify by the same amount to compare different amps.
Whilst taking a look at the amp specification sheet, you want to look for an amp with a high signal-to-noise ratio number which suggests that the amplifier outputs a small level of noise. Noise is generated due to a number of factors. The overall noise depends on how much hiss every element generates. Components which are part of the amp input stage will usually contribute most of the noise. The majority of modern power amps are digital small audio amplifiers, also called “class-d amplifiers”. The most popular technique for measuring the signal-to-noise ratio is to set the amplifier to a gain that allows the maximum output swing. Next the noise-floor energy is calculated in the frequency range between 20 Hz and 20 kHz and compared with the full scale signal energy.
Time and again the signal-to-noise ratio is shown in a more subjective manner as “dbA” or “A weighted”. In other words, this method tries to express how the noise is perceived by a human being. The A-weighted signal-to-noise ratio is generally larger than the unweighted ratio and is shown in a lot of amplifier spec sheets.