Head Units and Hi Volt Pre-outs

[JeffM 10+ year member]

I was wondering if someone can explain what the Volts on the RCA pre-outs does. My current Pioneer 4800 only has 2.2V pre outs, and Im going to be buying a new headunit with 5V or higher. What does the higher Volts do?

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[DejaWiz 5,000+ posts]

Nothing, except will allow for less of a chance of noise being inducted into the signal line in an environment that has quite a lot of EMF/RFI.

 

[lashlee 10+ year member]

It also allows you to turn the gains down on the amp. This may lead to cooler running, better dynamics, less noise production and may make the system seem cleaner.

 

[JeffM 10+ year member]

With my current setup, I can hear a hissing noise in the background. The only way to get rid of this is to lower the gain. If my headunit has a higher pre-out volt then will this noise go away?

 

[lashlee 10+ year member]

It should, though make sure that is where the noise is coming from. If the noise is from something else in the car, the noise may go away with a component swap.