I too have the D30R and I'm very impressed with them although I haven't had many other speakers to compared to. The tonal balance is superb and the lows are also very potent for it's size. I suspect the K series will be even more impressive. Even if placement is not critical due to the bottom firing port, it's still best to be away from the back wall.
Proac Speakers
Any of you folks using the Proac K Series speakers.? If so what model are you running and what are their pros and cons? Being that they have bottom bass ports, are they easy to set up in terms of minimum room interaction.