I have a few questions concerning the AR-303 loudspeakers . #1. Is it worth the effort to upgrade the crossover parts in this speaker ? Is there an audible difference ( stock vs upgrade )? # 2. I took a look at the crossover network in my speakers . Does anyone know the exact values of the various crossover parts for this speaker ? If so please list them . I realize this is asking much but info will be greatly appreciated . Thanks !