Thanks for all of the information.

I used to have just Subwoofers hooked up solely before I hooked up the Bass Shakers. I used to have the Woofer volume at 6 out of 8 and it was more than powerful enough to feel and act like 2 12" subwoofers should. After installing the Bass Shakers, I have to run the Woofer Volume at 8 out of 8 and I have to crank up the volume of the receiver to be able to feel the subwoofers.

I found a Line Driver and hopefully that will fix the issue. I am waiting for the auction to end and then they will ship it to me.