The Magnepan edition's center channel crossover point is 2 times the designation of the front panel (ex. 8-hz center channel designation is actually 160hz). All other ICBM features and functions are the same. This allows you to increase the crossover point to a maximum of 240hz for the center channel.
Magnepans center speaker the MGCC1 is somewhat deficient in upper to mid bass and requires a higher crossover to make the center speaker sound full. Work's quite well with my system and has improved the center speaker sound 100%.