I know my room sucks but cant do much about it. But I think what I need is for someone to come over that has a keen ear and spend the day tweeking it first. I have never set up my extreme slope crossover in my Hhorns or my center.
I would use a chemical striper. Because if you use a sander and you are not comfortable or not know what grit or pressure to use you can realy screw it up.
The way I see it is with one sub it is like a little rumble over there. But with four it is a earthquake in your room. To me that is more real to life.