After weeks of waiting for the parts for my sub they finally arrived and i finished it today. Put nemo on where the girl taps the glass,"Bllody hell" my son complained his bedroom on the opposite side of the house was shaking.it's a 7cu^ft box with a 15"dvc speaker and 250w amp. It's loud so no problem there,but how do i set it up correctly? How do i use the phase knob?.I bought 3.5in angled ports which extend but now they are installed how am i supposed to adjust them? and what am i suppose to be listening for if i could adjust them. I have never heard a good quality sub so i have no reference to judge whether mine sounds right or if it's "tight". there is a picture attached (i would put a couple more on but don't know how)i get a lot of bass where the doors are but because of the size of the sub don't have many options to move.