more or less, yes. the headunit and amp (if applicable) are capable of multiplying the input power level to a certain point. the issue here is that the input source (the cd) has a weaker input signal. the amp is still multiplying that up to a higher level, but isn't as high as what a stronger source would be. think of your multiplication tables. (random numbers btw) 2 x 12 = 24 vs 3 x 12 = 36. the amp is the constsant and the cd is the variable that changes the output.
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