B&W DM640 - is there anything wrong?

Hello all,
I just purchased a pair of B&W DM640s at a really great price to replace my DM602s. One tweeter was physically damaged, and I replaced it with a new one (thanks, B&W)

But for some reason, something does not sound right. I can't really tell what it is, obviously there's a difference going from bookshelf to floor standing. I'm still messing around with the speaker placement and room acoustics (I have panels), and I'm also contemplating building an MDF stand to raise them a foot or two.

Is there any real way to test the speakers to make sure everything is right? With 4 drivers on each (tweeter, mid, 2 woofers) I don't want to guess on this. The drivers look fine to the naked eye. I'm thinking removing each driver one by one and checking things out that way.

Thoughts?

Thanks,