Signal to noise ratio

[jack.mc]

A simple question, what is it? And what is a good quality component rated at? Thanks a lot,

Jack

 

[Tasmaniak]

“Signal to Noise” or “S/N” is the ratio, usually expressed in decibels, of the amount of true amplified output of the amplifier to the amount of extraneous noise injected into the signal. S/N ratios above 90 to 95dB are generally regarded as good.