You will have zero problem driving 805's with the Mac. If you ever have any doubts about amp to speaker, look at the tranformer. If it's heavy, it will work. If it's not, it won't. Usually it's multiply by 3 to compare tube watts and solid state, but I have never heard of any probs with the 2275 driving anything. Ever.
How about Manley Stingray, Biomimetic? You think that will drive the 805S easily,. Have the chance to pick one up used (as a second amp) at a good price so just thought I'd check.
I have heard them with a pair of Revel's M20s which a lot of people think are more difficult to drive than the 805's. But again, you know, you'd have to see if it suits you. But I would bet yes.
Personally I would go for the Gamut Di150.It is a knockout amplifier.HiFiChoice did a review a few months back,and used a B&W 802D while reviewing.The amp got 95% for sound quality.96% is the highest any product has gotten in HiFiChoice.Hope this input helps.
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