The Argon will be plenty loud with 55w, as long as its a decent amp. From what I understand you can't go solely by efficiency rating, you need to look at the response curve which with the Argon turns out to be an easier load than the efficiency rating alone would leave you to believe. I'm not claiming to fully understand the principles involved, this is from what I've read. I pushed the Argons with the 60w Ayre integrated and they sounded fantastic up to higher levels than I could normally tolerate. Plenty of bass, I would listen before you run out for a sub. You may want it, but check it without first. Good stands are essential IMO.
Amphion Argon 3
I am interested in getting these speakers. I have read the reviews, have talked with some dealers, seen some posts about them. I have not been anle to hear them in person, due to my location. I want to hear from owners of these little gems. Get some feedback on how well you like them. Thanks in advance.