Check out the Tekton thread by Corelli; you will find many specific sub combos and owner evaluations.
Also, be aware that a number of us DI owners find there is no need at all for subs. Suggest you check the response out with your room when they arrive and check the frequency response with a program such as REW (available free on the Internet). My room is fairly large (roughly 23 X 25 plus multiple openings) and the bass has to be slightly reduced to get a more even frequency response. Am getting plenty of energy down to 20hz.
Also, be aware that a number of us DI owners find there is no need at all for subs. Suggest you check the response out with your room when they arrive and check the frequency response with a program such as REW (available free on the Internet). My room is fairly large (roughly 23 X 25 plus multiple openings) and the bass has to be slightly reduced to get a more even frequency response. Am getting plenty of energy down to 20hz.