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This is exactly why many people champion setting your gains by ear other than any other method. The "problem" is that you have not set the gains to clip. The human ear can tolerate clipping to an extent, and by setting the signal so that it won't clip, you've limited the potential of your system.

Adding a line driver is not going to change anything. If you've set your system up using a multimeter or oscope, it's going to be the same volume no matter what is happening before the amplifier. You could have a discman plugged directly into your amplifier, and if you're setting the gain using a multimeter it will be the exact same level as your head unit with a 4 volt signal (assuming your amplifier has a sensitivity range that includes both of those levels ie .5v-5v).

If you want it to be louder there is one simple solution. Set your gains by ear. There are many many tutorials on this available. Set up your headunit correctly to be sending clean signal, then simply turn them up until it's either A) loud enough or B audibly clipping/distorting. back them off a tiny bit, and you're set. It's that easy

For further understanding see these links
http://www.bcae1.com/gaincon2.htm
http://www.bcae1.com/settinggainswithscope.htm
 

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I have been using this to setup the amps in fact
http://www.icixsound.com/vb/showthread.php?t=27819

But I cant the the voltages right unless I have the gains all the way maxed out and the volume at a rediculous level. I assume the voltage coming off the headunit is so low that the amps gains are having to overcome a huge amount of power. So more power from the preamps should mean lower gain setting to get to the voltages I want from the system correct.[/b]
That is correct. I didn't realize that you weren't able to get the correct voltage. If that is the case, a line driver should solve your problems :) there is never any harm in having a stronger signal.
 
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