I use a pair of Krell 3250 amps (with 861) and have been very happy with them. Certainly justifies Krell's reputation for great bass.

But, I agree with the other posts that just about any good quality amp will work (had adcoms before the Krells and they worked fine also).

Incidentally, the only compatibility problem I ever had was with an Aragon 8003 which did not like the active feedback system used by my Infinity speakers.

My Kit: 861v8+ID41, 800v4, UHD722, MD600, MS600, MS200, Oppo BDP-203, Genesis 201, Genesis 350 SE, Genesis S4-8 Sub, BG 520i, VTL MB450 II, Krell Showcase 7, Genesis 928 Subs, Danley DTS10 sub, SVS Ultra 16 subs.