Help tuning my amp

[silveradokid 10+ year member]

So on my amp it has an input gain setting, a switch that has two settings .1V-1.0V and 1.0V-8.0V, I figured out my head unit puts out 2-3V, but when I switched it from .1V-1.0V it was not nearly as loud, I'm wondering if it would be bad to run it on the .1V-1.0V instead of the 1.0V-8.0V? The only difference I noticed is that my subs were a lot quieter and they sounded better, just not as loud.

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