You will be fighting with the bass on those drivers for some time. For starters, they are on a concrete floor (like mine), wood floors allow for the bass to travel. Class A amps like Krell are going to be the amps if you want booming bass from those. Remember they are not a bass reflex set up (non ported). I ran my CT-17 and bypassed my TGP-III to see if I could get a little more pre juice to the amps to pump up the bass a little. It did hit a little harder.... A little. You have to remember what these speakers require, which is why I'm running 4 subs so I have plenty of low Hz on tap. The speakers sing like they are supposed to and will introduce you to a new world of sound, but driving them full range without a 120lb amp will cause you to pick your battles carefully.
For me I couldn't be happier with 4 Silver 7t's, due to my difficult road of amp swapping.
You have one advantage over me, I don't have the 9t's. So you have that extra boost on the bottom end that my 7t's don't.