Better Way To Biamp?

I was curious if you agoners will help me out here. I have a Mc207 with 2 channels powering each B&W 802N. I was just told that Im not actually getting 400 watts to the speaker. The way it was explained made sence i just never put much thought into it. I was wondering if they made some kind of crossover to put inbetween the amp and pre? So I would get the full 200 designated to the lower frequency and 200 to the high? I am just looking to get a lil more spl out of my system. I am finally very happy with it. So I would like to keep what I have just make it better if possible. Thanks Matt