Don't see much on Silverline Sonata so..

Massvm> If you are interested there is a pair of Sonatas for auction at a rediculously low price $1475.

I heard a pair today.Very impressed.Particularly since thwe amps and source where nothing special.

I had also noticed a shortage of information on these speakers, but became convinced by the Soundstage.com reviews and to a lesser extent audioreview. Emailing people who submit reviews can gather a lot of useful information.

I am very much loving the Sonatina IIs. Supposedly the bass is tighter than the Sonatas, and I really wanted light speakers rather than heavy ones so that repositioning them wouldn't be such a chore. I wound up putting rolled up socks in the ports, just to try it out, but liked it so much that they stayed. I found my subwoofer integrated better using this arrangement.

So, I haven't said much about the Sonatas, but they have the same dome tweeter and midrange as the Sonatina, as well as the same 6.5" mid-bass driver, and there is definitely a family sound, alluded to in the SoundStage reviews as well.
For me, that family sound is remarkable transparency and detail without edginess, a satisfying and non-fatiguing experience.

Good luck!