I was planing on putting them in a ported box tuned to 35Hz. It would have about 6ft^3 of internal room. Kicker recommends 2.25ft^3 max per woofer ported. Should i go smaller for the box or no? I have 42" wide, 19" tall for external dimensions and depth is not really a problem. Should i do like 5ft^3 internal or stay with 6ft^3? An suggestions welcome on tuning and box size. Thank you.