So i have been trying to make my own ported/vented enclosure for my DD Audio 612 sl D2 woofer but I don't have prior experience in this. I have GAS PRO 1001.1 amplifier for it and I plan to run it at 1 ohms. So do eny of you know how large of an enclosure should I make for it and what sized and lenght port should I use? Is 50l enclosure and 3 inch wide and 20cm long port too small?