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There's an active version of the DB1 but they originally came with Flying Mole amps and when they started failing the company went under so PMC came with their own amp which is very very good but also had some issues caused by heat if you leave them switched on the whole time.
There's a good wall mounting bracket available from PMC for fairly spicy money.
If I was going to run a pair I'd be thinking sub as well but then I moved to the TwoTwo5 actives with a Sub1 and that's a very good neutral monitoring setup but probably better as a nearfield setup.
LB1's are very good, pair them with hypex amps but they will be more than £600 with the amps, they do need power, 200w seemed best. I did run them with a Cambridge A1 for a few years and they're fine but extra power really helps the bass control.
Thanks will see. It seems they're passive and the idea of active simplifies things, plus wireless which makes things look neat on the wall. I'll try get a listen on some Kef lsx when I'm back in London.