As a factory-indoctrinated Mac sales guy, to those complaining about the appearance, I will guarantee they will not change it. It is a BIG part of their brand identity…you can buy a new Mac and integrate it with an older system, and it looks like it belongs. Huge brand loyalty builder.
This new amp has an electronic xover built in, so to use it properly the bass speakers should be passive woofers without internal passive low pass filters. The upper speaker can be anything. Who has passive subs, really? Otherwise you’re messing up an engineered passive network if you “double cross”. In most systems you should not use the crossover.