Hows this setup sound?

[Megalomaniac 5,000+ posts]

What are the important differences between the 9886 and 9887?

You can run active, which will give you more flexibility and can improve your overall sound quality when you hit all the sweets spots.

the actual differences are the xover options, EQ, and time alignment. When you utilize these you can eliminate the passive crossover which gives you more control.