I have the same power wire problem, I don't [I]think[I] that there will be any interference crossing over into the speaker wires, but I am kicking around an idea to run the power wire for my sub amp up through the a-pillar and going up top with it. I already have all that wiring installed though so I won't be messing with it if there isn't a problem. I have not had the door panels off yet so I guess after I get in there and v-block everything I'll have a better idea of what to do with those crossovers. They are about 4 inches wide by 5 inches long by about 1-1/4 inches tall >.> If I have a eureka moment I'll post up pics of my solution