Dang... Just missed a chance to put in my two-cents worth..
I was going to ask if you had checked to be sure that the factory installed bi-amp straps were still in place.. If not, and you were running the speaker leads into the bottom two posts, you would not be sending any signal to the tweeters..
You wouldn't be the 1st to have that that happen..

LFE ! The rest is just details..