Glad you read thru some posts/articles to get a hang of the subject....
Sonodyne SiA 320 is a decent amplifier....Continuos power should be around 60 - 70W/Channel...
(a) It will not damage the tweeter of Sonus 2605..... (b) It will deliver acceptable music
One of my colleague had Sonodyne Sia 320 + Sonus 2605 Combo & i spent a good time playing different flim music (Audio CD's) with it..... the combo was very good & to my liking.....The amp is good to produce acceptable music but more power would have given good authority to the speakers...
I have also paired the Sonus 2605 with NAD C326 (Same power as Sia 320)... I wouldn't hesitate to say that sia 320 was no match to NAD C326 authority.

hyeah: