i'm guessin you are grounded in or around same area the pos wire hit body, and if so that meens you sent power into the amp by way of ground, not sure but thats not good.............could have discharged your amp and poss. messed up cap's in it ..........just a guess.......
Personaly, i wouldn't run two diff sub's, but they are the same size atleast.... you could pull spec's for both and see how close or far-off they are......let me know how it turns out.........