Gary,
I know Upgrade-itis all too well, I have been afflicted now for several years, god I hope the credit cards don't give out, or Upgrade-itis will be the death of me.
Anyways, the CLX have nice bass staight out of the box, in fact many like them just like that with no subwoofer. They are really great speakers, one of the best and I think all my tweak does, is tighten or clear the bass just a little, but that could be in my head, maybe I just like black granite.
And then again whenever the Gotham speaks, everyone listens so since I listen strictly to multi-channel, the CLXs just sound spectacular.
If you have an interest in a less than 1 year old Descent i with the CLX card, let me know, just send me a PM. I have a Descent i that I will probably put up for sale soon.
This is a black wood Descent i that it is perfect, it has less than a 100 hours on it and it works perfectly with CLXs, allowing you to dial them in so that they are a perfect match.