I have the Proac D20R speakers they were really easy to set up.I also have a Rel 812 subwoofer and I enjoy the flexibility of a sub because it lets you dial in the bass the way you like it.The subwoofer really improve my sound as it gives you a bigger soundstage and the clarity in the midrange was was also better, and my center focus improve also.If I was you I would go with the k6 and subs. Let us know how it turns out all the best.