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Message: <blockquote data-quote="Jeffdachef" data-source="post: 8532436" data-attributes="member: 650438">simple your brutus goes from 9 volts to .2 volts.   Your alpine goes from 5 volts to .2 voltsmeaning the hifonics needs either a much stronger pre-out voltage signal or very high gain settings to actually put out.    Usually want to max out sub level, head unit volume at 80% then set gains afterwards if you dont want to be maxed out on gains. This maximizes your head unit pre-out voltage signal output.Basically your current head unit settings, you arent even seeing more than 1 volt of pre-out voltage out of your head unit right now.</blockquote>

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