Yes, you’re right. I was thinking of the Hegel. The EX-8 would probably spec at about 130-140wpc (nominal, of course) for my 6-ohm Harbeths. Thanks for catching that.
Harbeth recommends a nominal 25wpc, but also released a video in which the designer/owner of the company powered them with a high-end amp that offered VU meters. You could see that the Harbeths drew upwards of 300 watts on peaks, and the final recommendation was that, although you could get decent dynamics with a lower-powered amp, the entire Harbeth line would do its best with amplification that had plenty of raw power, especially overhead. That's one area where Ayre is outclassed by Hegel, at least in my application.
Harbeths have relatively low sensitivity, but other than that, they were deliberately designed to present an easy load. See JA’s measurements in Stereophile. Rememeber that these are thin-walled critters with roots going back to the BBC designs. As an old LS3/5A fan, that was one thing that originally caught my attention many years ago, when I first started thinking about them when I was forced to sell my Quad 57s.