contact Adcom and ask them......then you will know for sure.
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Very few amps are stable into 2 ohms, you’d have to look into truly high end stuff. Maybe Pass Labs, Krell, Conrad Johnson. But you may not need 2 ohm stable. Why are you asking for this rating in an amp? Very few speakers dip down into 2 ohms, I can think of an older model of Infinity speakers.
It might be cheaper for you to ask what owners of your speakers are having success with in amplifiers as well.
On page 9 of the user manual:
All loudspeaker systems having a nominal impedance down to 2 ohms can be connected to, and driven by, the GFA-565SE. The GFA-565SE can drive these low impedances at more than adequate power levels with no difficulty. lt should be noted here that many loudspeaker systems which are rated, nominally, at 4 ohms drop in impedance, in some parts of their frequency range, to as low as 2 ohms (and some others to even less than 2 ohms). You will not experience difficulties even with these very-low-impedance loads.My guess is 8-10 watt in class A, you can ask Adcom: