Dual-concentric Tannoys work well with a wide range of amplification. I've used various DC models with both tubes and SS, ranging from 20 Watts (restored Heathkits & Eicos) to 275+. I currently run Rogue Apollo Dark KT120 monoblocks at 275 Watts/ch (maybe a bit more), into Canterbury GR. I gave my girlfriend a set of Tannoy Eyris DC3 with NAD C 368 (class D) - what a gem of a little system. It all sounds wonderful; owners can choose amps based on what they wish to prioritize. With high power amps, you can extract the maximum dynamics and impact out of your Tannoys, especially for loud volume listening. With quality SS amplification (even/especially class D), you can hit a good balance of dynamics, good overall sound, and great value for the money. With sweet low-power tube amps, you can get an even more beautiful liquid midrange, and optimize lower volume listening - at the expense of potentially hitting clipping with louder volumes of rock and orchestral music.