I noticed that after I built the boxes and put the subs in, if I pushed the sub in there was a tiny amount of an air leak on one of the screw areas for 3 of the subs (I have 4 total). I tried to tighten the screw but it doesn't go anymore. How will this affect sound quality and is there an easy fix to it?
That’s most likely the air coming out of the leak! There is nothing like building a sealed sw and then taking your finger tips and press into the driver. You want it to be stiff and no whoosh sound from a leak! Go with what worm suggests then.