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I had auditioned the Duetta II extensively back in its heydey in the late eighties. The Duettas are balanced very much on the warm side (but conversely can be strident in the upper mids and highs) and like being paired with an amplifier that is very dynamic, clean top end, and with high power. I wouldn't pair it with an amp that is inherently on the warm side. The Duetta can be ponderous and bass heavy with the wrong setup! The Duetta is a nominal 4 ohm load and demands a very good high current amp. The Classe'25 would be a very good match as would the Aragon. I heard the Duetta 2 with the Aragon 4004 and it was very nice. The 8008BB should work very well as it is an even more powerful version of the 4004. I thought the Threshold amps (S300 or preferably S500) of that period were also very good with the Apogee. Also agree that early Classe' designs (DR3,DR8,& DR9) would also work well because of their high current design. Personally, I preferred the Apogees with Threshold over Classe'. The Classe' amps are very 3D with a great soundstage and great musical texture. The Thresholds were livelier and more dynamic.
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