mapman,
It makes me happy that you are enjoying your "free" speakers.
I've had a somewhat similar experience. I was in a resale shop a year or so ago and the owner was playing FM radio through a pair of Infinity Qa speakers that he had priced at $79. It sounded GREAT! I didn't buy them that day but keep thinking about them. Went back a few weeks later and they were long gone, but it started me on the hunt for a pair of classic Infinitys. I ended up buying a pair of Infinity Qbs for $117 and they got me back into quality sound after taking about 7 years off from the hobby. They do a lot of things right and it makes me smile knowing they cost a fraction of my last 5-10 pair of speakers.
Since then I found a pair of nicely rehab'd Infinity RS 1.5's for $250 and they are even better with incredible bottom end for a large bookshelf speaker and , of course, that wonderfully smooth and extended EMIT tweeter.
I've stopped looking at expensive speakers, but I do keep my eyes open for vintage Infinity speaker up the line from my RS 1.5s.
Enjoy the music brother, in your sunroom and everywhere else.