I believe what Alan Shaw means is that any well designed amp will work. In other words a nice Rega, or Arcam, any competent amp will do. The Harbeths aren't a difficult load. Will the Harbeths sound better will better amps , of course. But they don't need a huge 200 watter, or $10K to get good sound, a good amp will get one going. Fyi I have Harbeth SHL5 driven by a Plinius 9200 works fine. Would a better amp sound better? I'm sure it would but it sounds pretty good with the 9200 :-)
what speakers demand high end electronics
Curious as to what speakers really need high end electronics to sound there best. Not power, but quality.