I had a Placette Passive and it was VERY GOOD. I would not bet that any other passive is going to be any better. One of my best friends also has the Placette Passive in his system, which is a very highly resolving system. It sounds awesome!
If it were me (and its not), I would only buy a different passive that had a return policy, or was purchased used for a "can't lose" price so the unit could be re-sold if it did not out-perform the Placette.
I've since moved on from the Placette, but only because I wanted to consolidate to an integrated amp and simplify my setup.