Floored by these. I picked them up at a yard sale for very cheap and because they were mitsubishi (I wasn't even aware mitsubishi made speakers, and they were part of a home theater system), I assumed they would only be serviceable. I was delighted with the sound when I hooked them up to my 70s Nikko running 45 wpc. Then I hooked them up to a yamaha natural sound running 80wpc, and I ended up having to run them side by side with my BA Lynnfield series just to do a shootout. They hung in there! Actually topped the BA's low end, but the soft silk tweeter couldn't quite keep up. Really outstanding speakers... if you can find a pair cheap (and I have seen others since), I recommend them.
NOTE: I believe s200 refers to the entire system, while the speakers have their own numbers... f200, etc.