I'll disagree with Su2618. Although low powered, these amps are able to push my Paradigm Phantoms (older bookshelf models) to a fairly high volume. I've seen specs on my speakers that range from only 89db to 91db efficiency. They probably wouldn't run a pair of maggies very well but i'm VERY happy with their performance so far in a second system I have. I recommend spending the extra $20 per amp to get the tube covers and the removable power cord. The tube cover greatly enhances the appearance.
