Depends on your space.
I have been running my WP7s for several years with the 100 wpc Music Reference RM200, which is a glorious combination in my relatively small room. Bass quality is exceptional, but not Krell-like. Of course, the RM200 is not your average 100 wpc tube amp.
I've heard the RM200 with Sophias and it works great as long as the room is not too large. Since the Sophias are relatively efficient a gigantic amp should not be necessary unless you intend on habitually playing them at jet plane levels in a large room.
I have been running my WP7s for several years with the 100 wpc Music Reference RM200, which is a glorious combination in my relatively small room. Bass quality is exceptional, but not Krell-like. Of course, the RM200 is not your average 100 wpc tube amp.
I've heard the RM200 with Sophias and it works great as long as the room is not too large. Since the Sophias are relatively efficient a gigantic amp should not be necessary unless you intend on habitually playing them at jet plane levels in a large room.