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If you just have an amplifier with no processors, you can just turn your system on, turn the volume down on the head unit and adjust the gains to where you can hear hiss and then turn it down so you don't hear any hiss. It's been several months since I set mine and I'll double-check but I think the head unit puts out a fairly nice line voltage so you don't have to turn the gains up too much. The area where I had to adjust is the front/rear levels because the OEM speakers I left in the back were much more efficient.
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