What speakers to go with a single-ended valve amp of 10W?

[admin_exported]

I know of a Unison S2 amp going for a good price but am not sure what speakers would do it justice. Heard it on Sonus Faber Concerto Domus and it sounded breathtaking, but the bass was lacking. I suspect I just need to consider a push-pull instead, but curious if anyone can recommend anything that will work well and provide bass.

 

[Mike_Schmidt]

Proac D28's do.