So ya. I got a lil ten inch L7 im tryna actually make sound good, but i've never built a 4th order before. I've researched a few articles and i'm understanding the basic jists of them. but its always taken me two times to get a box right. So... im thinking like. 2.5:1 or something? sealed chamber at 1cube, ported at 2.5 ish with the sub inverted into the ported chamber. However, i have no idea if that seems like a great idea. It probly would sound good. But im trying to figure out what relationship the sealed and ported chamber share. Im sure there are multiple ways their airspace will make the outcome vary... i was thinking the sealed must be big enough to allow the sub to move freely enough, yet controlled enough to not damage and still create pressure in the ported section. So i guess whos the 4th order guru here. Should i be posting thiele small parameters? oh and btw i go back like 8 years with this forum and im sure most of the old admins are dead and gone or whatever, but it be cool if i could learn a little something again. Worst comes to worst i build it not knowing wtf im doing it that way for, but what is the fun if you dont understand the way youre manipulating the sound?