Generally speaking, the higher the number, the better. Good amplifiers have a higher signal-to-noise (SNR) ratio. The SNR, listed in decibels (dB) is a way of comparing how much audio signal the amp has vs the amount of electrical noise it has internally. It’s also more noticeable with the amp’s gain turned up. Background noise exists in all amplifiers and appears as a slight “hiss” when you listen with no music playing. The best, depending upon the rating used, will be 100dB and higher. A 4 channel amplifier with good sound quality will have a number around 90dB and above. Ideally the amount of noise will be low compared to the audio signal level. The signal-to-noise ratio (SNR), rated in decibels (dB) is a way comparing the amount of audio signal to the level of noise signal in a car amplifier.
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