I have had a pair a Duetta Signatures since '89 that have gone through various and many tweaks and mods, and have lived with several amps---Krell, AR, and Muse. About 5 yrs ago, on the advice of several other Apogee owners, I tried the Odyssey Mono amps. I think they are an excellent match. The amps really surprised me, given their affordable pricing (manufacturer direct). I prefer them to any of the other amps I have lived with. Odyssey makes a stereo amp that should work (the amp should plenty of current) with the Duetta 2s. The stereo amp can be found on audiogon for ~$700-800. I have seen the monos amps (various versions---extemes, SE) on audiogon ~$1700-2000. I would recommend you call Klaus, the manufacturer (an excellent person to talk to), and getting his recommendation. The best time to reach him is late in the evening, central time. (317) 299-5578. odysseyaudio.com