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<blockquote data-quote="req" data-source="post: 2787669" data-attributes="member: 555713">here is the skinny.headunit has a MAX OUTPUT VOLTAGE (in the RCA outputs). lets assume its 4v.amplifers have a range of INPUT VOLTAGE (in the RCA inputs). lets assume thats 1v to 10v. (wich are very exaggerated numbers)your headunit will never ACTUALLY play 4v on the outputs, because that would be with bass boost and bass all the way up playing test tones ect ect. but lets ASSUME, SOMEDAY 4v will be reached.so, you look in the manual. and you see the gain knob. on the amp there are numbers 1-20. and it says in the manual, that the 1 setting on the amplifier is 10v, and the 20 setting on the amplifier is 1v.you need to realize, the HIGHER the voltage output of the headunit, the LESS the amplifier needs to work to get the RMS output. so the HIGHER the voltage is set for the gain, you are tell the amp that the headunit puts out MORE voltage, and the amp can work less.so, in retrospect, if your buddy has a 4v headunit, and you told the amp he had a 3v headunit. the amp will work harder to make up for less input power - aka, your gain is set incorrectly. and thats bad. mmmmkay.read manulas. they are ftw.</blockquote>

[QUOTE="req, post: 2787669, member: 555713"] here is the skinny. headunit has a MAX OUTPUT VOLTAGE (in the RCA outputs). lets assume its 4v. amplifers have a range of INPUT VOLTAGE (in the RCA inputs). lets assume thats 1v to 10v. (wich are very exaggerated numbers) your headunit will never ACTUALLY play 4v on the outputs, because that would be with bass boost and bass all the way up playing test tones ect ect. but lets ASSUME, SOMEDAY 4v will be reached. so, you look in the manual. and you see the gain knob. on the amp there are numbers 1-20. and it says in the manual, that the 1 setting on the amplifier is 10v, and the 20 setting on the amplifier is 1v. you need to realize, the HIGHER the voltage output of the headunit, the LESS the amplifier needs to work to get the RMS output. so the HIGHER the voltage is set for the gain, you are tell the amp that the headunit puts out MORE voltage, and the amp can work less. so, in retrospect, if your buddy has a 4v headunit, and you told the amp he had a 3v headunit. the amp will work harder to make up for less input power - aka, your gain is set incorrectly. and thats bad. mmmmkay. read manulas. they are ftw. [/QUOTE]

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