Welcome!
I sent you a PM, but I thought I should respond here as well for others who might want to know. Well this card does not have that feature. Creative Labs and Turtle beach cards have that kind of feature. However, if you use a program called Frequency Allocator Full/Lite you with get crossovers for each channel which will do your bass management.
www.thuneau.com
You won't be able to set speaker size, but you won't need it. This program is much more powerful then the stuff provided with other soundcards.