The Pioneer BS21s arrived today (paid $45 delivered), and I compared them with the BS41 (paid $80 delivered). The 21s are not THAT much smaller - about an inch shorter, and identical shape and build quality, with an identical tweeter and a smaller woofer/mid. Very similar sound. Highs and mids are the same - I noticed no difference at all. I played some music with a lot of bass - a really nice piano recording with a lot of low notes, and some cello music. The 41s, being bigger and having a larger mid/woofer, sounded more resonant on low notes. But the 21s played the notes with a nice clear taught sound, just lacked the very lowest resonance on the bass notes. I was actually surprised - I was expecting a lot smaller and less capable speaker, but the 21s are very nice. . .