Good to hear power is not an issue with your OB1's. Most PMC speakers can go really loud and rock the house, especially FB1+'s and above.
I've got the LB1 Signatures which was the replacement to the Classics. I certainly liked them a lot with their neutral and clean presentation. Quality speakers no doubt as they were being used in some recording studios worldwide. The only weakness they have is deep bass but I have compensated this with the employment of a sub. They were discontinued just recently as Dynaudio has stopped supplying their drivers to PMC(the LB1's use Dynaudio drivers).