yes, nice comment good explanation
commonly sealed box drop 3db
as air is trapped inside , woofer cone acts like suspension , to work against force , it require more power (if you draw a graph or see a graph on software , you will see smooth parabola curve , x axis = db , y = axis frequency
comparing to vented box , air push/pull by port , doesnt require much effort from sub , it deals their in easier way
IN DEPTH " A tuned box of 30 hz , and tuned box of 40hz"
30hz will require bit more power then 40hz tuned box
if you see the graph ( the curve will contain a sharp peak on high tuned box while defines higher DB SPL )
Lafafa`s problem with car is that , he cant upgrate alternator , due to space issue which he told