I just have on 12" Rockford-Fosgate sub and an alpine amp-what kind of systems does everyone else have-i am doing an upgrade but want to figure out what works the best with the TSX. The 12" was fine for my RSX but isn't enough bass for the TSX. I think 2 12" might be too much-whos done what. AND has anyone else had a problem hookng a system up to a TSX with Navi (my car broke down 3 times-it was linked back to my system) Thanks