I recently AB'd the Yorkville Passives and the 20/20s, as well as the YSM1p and the 20/20bas (with the Mackie 624). The passives were powered with a TA1600. My reference cds were: RamonesMania, A Hard Days Night, and Mr T. Experience's Revenge is Sweet and So Are You (closely related to most of my projects)
In both cases, the Events sounded like really nice hi-fi speakers. The 20/20bas were a little faster on the transients than the unpowered 20/20, but both failed in comparison to either YSM model (which were both floored by the mackies).
The bass response on the Events was better, as the Yorkvilles only go down to 40hz, but if you spend some time placing them right, the YSMs can give a pretty good picture (watch your room tone). Unless you're doing bass heavy dance music or hip-hop (in which case you'd need the Yorkville sub) I wouldn't consider it a deciding factor.
To me, the Yorkvilles sounded much more precise, like they were designed for mixing. I felt the Events were much more marketable as great home theater speakers.
In the end, I wanted the Mackies, but my bank account disagreed- I went with the powered Yorkvilles...they should be here on Monday. I believe I'll enjoy them
