Yes there has. Search my posts in this thread. Sorry, in a nutshell I stated that the M200 is much more refined and detailed than the DN-1000, but the Dunu too has a wonderful full detailed sound (actually the Dunu sound I think is a bit fuller, but the KEF wins in refinement and details). And let me make it clear that the rich sounding M200 does have a full sound.
I wouldn't want to have to choose between the two, but if I had too I would go with the KEF M200 (especially now that I've found some tips that give me a great fit). The M200 has an airier sound too.
Edited by ericp10 - 10/23/13 at 10:05pm