Hi, I have a Alpine V12 amp, running bridged at 400 watts to one 10 inch JLW3 in a sealed box.

Whenever the sub hits hard when its turned up, my headlights dim at night. This gets really annoying and I know it means im drawing too much power from my other electrical resources.

Any way to fix this?
Would a capacitator help, and if so, any recommendations?

thanks