Hi, Basically I have a JVC Head Unit with 5v RCA preouts. I have a factory intstalled Amp that currently gets 2v from the factory Head Unit. I want to replace the Factory head unit with the JVC but I have to keep the existing amp. My question is: Does the voltage of the preouts change with the volume the Head Unit is set to? Eg If I keep the volume low on the head unit, would the RCA voltage be less then the specs of 5v? Any help would be great. Cheers