I"m with Z on this one. Every designer is different. My Proacs all sounded better bi wired, but ONLY when using the same wire for all the runs. My new Vandersteen's have to be bi wired. He's designed them that way and he'll even tell you that you are better off running less expensive cable to bi wire than get an expensive single cable for one connection.
This is one of those times that it makes sense to find a dealer you trust and who knows your system do you can listen to the difference in their store or they can loan you cables for you to try.
This is one of those times that it makes sense to find a dealer you trust and who knows your system do you can listen to the difference in their store or they can loan you cables for you to try.