I have a fiberglass enclosure that I built It has a place for 2 ports, and it handles 2 12s. The box is 5.03 FT3, The subs I plan on using are Boss P12DVC. They need 1.95 FT3 for a ported box. My fiberglass box does not have a divider. I am going to use a Boss Mono PH4000D amp. I plan on using 2: 3"x6.75" ports to obtain a tune of 33hz. I am going to use 2x4 boards cut into pieces and then glue them to the inside of the box and subtracting their FT3 until the interior FT3 is equal to 3.9 FT3. I want to make sure that all of this will work. Thank You for your time. I will use approximately 37: 2x4x10 pieces for the interior.