Solo is overly bright. try a few layers of toilet paper over the tweeters behind the grille to tame this. Bass is reasonable for a 4" driver, but really nothing special - a decent 6" 2-way has at least as much if not more bass. (Paradigm ref. Studio 20, Aerial 5's come to mind). Also, given that Platinum is out of business and replacement drivers are not available, the solo is a bit of a risky proposition IMHO. I'd only consider buying a set (I know you already have some, but for those who don't) if the price was < $400 and you have a dead room or system to put them in.
-Ed
-Ed