I have one of these amps arriving sometime today, but after reading the manual online am a little confused about setting the gain. It appears that this amp does not have the regular dial, so I can't use the multimeter method.

What it does have is a digital display from 0.2-4v which it says is used to "Adjust the input level of the amplifier to match the output of the connected head unit" so does this mean I should set it to 2v because my HU has 2v pre-outs? if not, how do I set my gains?

Thanks.