KEF LS50 Meta

I also tried my new LS50 Meta's this week.  They seem to be a distinct improvement over the LS50, with better clarity and sound stage.  I use them with duel REL T/7i subwoofers.  They seem to need more amp power than the LS50. I have a Parasound Halo A 21+ with Paraound P6 preamp.  They also seem to improve markedly with break-in.  I would apprecieate any comments on my observations.  Thanks.

I have the KEF LS50's, and I am very pleased with them.  I am considering upgrading to the Meta.  What should I do with my old LS50?  Can I use them as surround speakers?  They seem to need a lot of power.  Where would I sell  them?