All-in-One solutions, eh? During my time building speaker enclosures, I learned about placing drivers a minimum distance from each other, as well as the components in the crossover a minimum distance from the drivers because inductors and speaker coils create fields that can interact with one another. We can't have that now! So watch out for compact, all-in-one designs. Also, watch out for 90-degree turns in the traces of your circuit boards that may create reflections and audible distortion. 
