I believe you run the pos to the positive terminal on your master amp and the neg to the positive on the slave amp, correct me if im wrong i also am trying to understand this 2
i dont know how you feel about power acoustik but the PTID 5300 touchscreen works great for me and doesnt skip at all on any cd i have played in there!
i would suggest either attempting to make a box or having a box built for you instead of 2 prefab boxes but thats just me, Good luck with this tho man !
I dont think he was dissin the way FI makes their subs or the quality of it, i think he was just saying that the DC level 4s were built a little more tougher and can handle alittle more then what the BL can