I'm amazed that you would not have researched this before buying...there are no upgrades available for the 5.1 from Wilson other than perhaps Grilles. Wilson's web site clearly points out the upgrade path....(http://www.wilsonaudio.com/products/upgrades/index.html). That said...The 5.1's and all of the predecessors are tremendous. They represent the pinnacle of reasonably sized speakers for the 1997 era. They have superb imaging capablilty, they can play very loud, and very clear, they are comfortable in a reasonable sized room, the tweeter floats in the air, the midrange is lush and real, the bass is tight and super fast, the fit and finish is world renoun..these speakers will respond and improve to any electronics that you can afford to buy..what in the world would possess you to want to look at making an upgrade?
What don't you like about these speakers?
What don't you like about these speakers?