What's your voltage dropping to with all 4 1600s? I know u got a h/o alt. But do u have any battery reserve besides lead acid battery? You wouldn't believe the gains u would make with a good lithium bank to support the amperage draw. Alot of people don't like to have voltmeters because then they see how bad their dropping. Lol. The higher u can keep your voltage the more watts u will get from amp, it'll run cooler and last alot longer.
