That’s necessary to provide sufficient power that can drive your component speakers or highs and mids at a better volume with low distortion. Just like standard 2-channel amps, they contain a special section that steps up a vehicle’s 12V supply to deliver a higher one (often around positive and negative 28 volts or so) The main difference is that 4 channel amps contain a 2nd pair of amplification stages to boost the input signal and drive speakers. There are a few differences to know about when shopping and just to have a better understanding.
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