Late to this post, but I'm running a pair of mono Schiit Aegir's to power my LS50 Metas and I love the sound.
Using a Parasound P7 preamp for both it's multi channel capability and it's balanced outputs.
I initially had one Aegir, but it just wasn't enough to power the Metas so I bought another and I'm glad I did.
I also have a pair of small REL subs to give some more heft to the bottom end, but even without those the sound is very nice.