I think there is more in this but here is a little teaser vid and he gets down to right at 11 volts we will be fixing the voltage issue soon as well as adding a second amp.
View attachment 26519899subs forward port side towards drivers side and box is 5.25 tuned to 32hz thats pretty much the box some dimensions are a little different as i decided to doublw baffle front and snd port sides.