@hilde45 You don't sound confused, placement is a separate issue. So:
1)OP says he needs a speaker that will work 6" from the wall. - IMHO, that leaves only a few good choices. This is a more impactful limitation than many choose to admit...often resulting in disappointment(e.g. Devores against a wall looking lovely and sounding a fraction of their potential)
2) Of those few good choices, some are efficient and an easy load and would would work well with low powered tubes, etc. (e.g. Audio Note or Khorns). Others like Larsen would sound great if and only if the OP is willing to pair with a higher powered amp in an effort to overcome issue #1.
Cheers & goodbye,
Spencer