Reference links:
http://en.wikipedia.org/wiki/Signal-to-noise_ratio
signal-to-noise ratio (SNR):
The ratio of the amplitude of the desired signal to the amplitude of noise signals at a given point in time.
SNR is expressed as 20 times the logarithm of the amplitude ratio, or 10 times the logarithm of the power ratio.
SNR is usually expressed in decibels (dB) and in terms of peak values for impulse noise and root-mean-square (RMS) values for random noise. In defining or specifying the SNR, both the signal and noise should be characterized, e.g., peak-signal-to-peak-noise ratio, in order to avoid ambiguity.
The SNR of car amplifiers today is below the threshold of human hearing, so this measurement is of little use when comparing amplifiers. Factors such as damping factor, and power supply voltage are more important in determining the quality of an amp.
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