Well, the Harbeth website recommends 100-250 watt amps. They were designed as a "drop-in" replacement for a large BBC monitor, and as a professional monitor, probably unequaled. Very few people have them in their homes and it seems like 3 of them have them up for sale. They are very large, and with a 12 inch woofer, difficult to situate in a real world room. They are the favorite speakers of Robert E Greene (REG), the longtime speaker reviwer for The Absolute Sound (TAS). Though they are listed below a lot of more expensive speakers on TAS's recommended list, REG says they are demonstrably better than almost all (maybe all) the more expensive speakers listed ahead of them.
I don't think your room is big enough for them.
I don't think your room is big enough for them.