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<blockquote data-quote="-DZ-" data-source="post: 284599" data-attributes="member: 545833">Wrong.Higher pre-out voltages allow for a &quot;cleaner&quot; signal to arrive to the amplifier. The higher voltages allow for the actual audio portion of the signal to be &#039;louder&#039; than any noise that may be on or near the interconnect. It also allows for a lower gain setting.Contrary to popular belief, 4V head units are not &quot;louder&quot; than 2V head units, 8V head units are not louder than 4V head units. You match the input sensitivity (&quot;Gain control&quot;) on the amplifier to match the signal being input to the amplifier from the head unit. If you have the gain control adjusted to get full power out of the amplifier, weather you are running a 2V or an 8V out head unit, it&#039;s going to be just as loud. 2V head units will have to use a higher gain setting, which may allow for more noise and in some poor quality amplifiers, some hiss.If you use a head unit with 8V preouts on an amplifier that only accepts 4V in, you will be severly distorting the amplifier when you turn it up. I&#039;d either use a line attenuator or get a better matched HU/Amplifier combination.</blockquote>

[QUOTE="-DZ-, post: 284599, member: 545833"] Wrong. Higher pre-out voltages allow for a "cleaner" signal to arrive to the amplifier. The higher voltages allow for the actual audio portion of the signal to be 'louder' than any noise that may be on or near the interconnect. It also allows for a lower gain setting. Contrary to popular belief, 4V head units are not "louder" than 2V head units, 8V head units are not louder than 4V head units. You match the input sensitivity ("Gain control") on the amplifier to match the signal being input to the amplifier from the head unit. If you have the gain control adjusted to get full power out of the amplifier, weather you are running a 2V or an 8V out head unit, it's going to be just as loud. 2V head units will have to use a higher gain setting, which may allow for more noise and in some poor quality amplifiers, some hiss. If you use a head unit with 8V preouts on an amplifier that only accepts 4V in, you will be severly distorting the amplifier when you turn it up. I'd either use a line attenuator or get a better matched HU/Amplifier combination. [/QUOTE]

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