Re: My sub hits a fraction of a second late..
I test the phase of my subs in relations to the mid/tweeters by playing some hardcore techno music like Happy Hardcore that has basically the highest BPM than any other music.
Adjust the phase control(either fixed or variable) until the bass hits the same time as the mids. If your amp does not have a phase control then just invert the pos/neg speaker wire at the amp OR(not both) the speaker terminal on the box, the result is just like flipping the 0-180 phase switch.
Sold to: Mills561, Kross6622, sleazebagger, shpatb, esmokah
Bought from: DJ Nitrous 427, 97maxima