Hmmm, I guess "Outlaw" was an appropriate name for it.
Did you get your subs working yet, via speaker wires to sub and out of sub?
I just re-read your OP, and out of curiosity, what is your second sub?
And your original (first) sub?
And also, since I am ASSUMING that your original single sub was hooked up and operating via speaker wire connections, is it at all possible that a problem is existing with the second sub that is causing the fuse to blow?