Clipping(?) with two 12" Pioneer subs

[LosIsATool 5,000+ posts]

I found out my headunit's pre-amp voltage is 2 volts. I'm not sure what to do with that info

That's right around 1/2 or a bit less on most amps. Again all boost off

 

[CDE219]

I set my amp gain the other day by calculating the rms watts of the amp multiply by the ohms you are running at, find the square route of that then with subs disconected and volume at 75% played a 50hz bass note, put the meter across the terminals and turn the gain untill you get your reading of your calculation, mine was 42.42 on a 1800w rms amp gain was set just above half way when it read correct, and it made a hell of a difference as aposed to doin it by ear.....hope this helps you....