Testing water might be getting out the game if price is right I’ll sell it if not I’ll hold on to it for my son .those who know bout car audio should know what I have if not maybe it’s not for you .1st is a synergy audio 3.1 amp very lightly used beast of a amp 2nd fl audio sp4 v1 sub d1 15 been sitting in original box for a few years not broke in yet 3rd Ces 40ah lithuim battery beast of a battery new condition also brand new build box everything is very lightly used and 100% working you wont be disappointed it’s still install in my car do you can hear it .$1600 take it will not part out n please serious only I will delete when gone .Thanks Dd dc Rockford fosgate ruthless audio alpine kicker jl