Gain setting question

[Jacobman 10+ year member]

My amp is rated at 400rms at 14v, my car doesnt put out 14v so i figured out my amp puts out 342rms at 12v. So should i use the 342 or 400 for the number to take the square root of?

Also why does most amp info only tell you what it does at 14v, if the majority of cars only do 12v. How do i get 14v?

Click to read more...

 

[helotaxi 5,000+ posts]

HTe majority of cars do 14V. Measure the voltage with the car running. If you are only getting 12V you have a problem.

Also, how did you figure 342W @12v?

 

[Jacobman 10+ year member]

Will do here shortly, its a 96' plymouth neon if that matters. Oh and i used cross multiplication to figure it out. 14/400 x 12/X