Audio Space LS-3/5a Bookshelf with SW-1a Subs

Should be fine. The speakers are quite inefficient so throwing more power at them is a little like pissing up a rope.

OK, fair enough. Having owned two pairs of Rogers, and for a while with subwoofers, what I was trying to say was the don't produce high volumes no matter what you do. And they don't like too much power as it can blow the tweeters. IIRC they are rated at 25 watts, but most likely 50 is max unless they are subwoofered.