Hello everybody noob on board here, I'm having a enclourse built Tommorow fr three sundown zv3 15"s in 9.83 cubes net after displacements. The subs will be in a triangle formation almost . I want to tune to about 34hz and I want to use two 8" aero ports.. I need to no wat length to cut the aero tube to and how long will it be from flare to flare total length. If needed my box external dimensions are 41.5w. 21.5h. 28.5l ,, any help will be much appreciated.