Have never heard DSP3100s or DSP3200s but I do have M33s on my desk about 3 feet away from me. I find the configuration a little bass-heavy but have not yet worked out whether this is the speakers, the desk or the fact that one of them is only 6 inches from a corner ... all of which, I am sure, prevents the poor speakers from showing their best.
The other thing I have not yet solved properly is how close the signal and electrical cables are as my desk is pretty cluttered (laptop, printer, M33s, M502, ADSL router, Cambridge DAC Magic, WD NAS, shredder, HomePlug AV adapter). I ought to spend some time sorting it out, which might improve things.
Nonetheless, they sound pretty good.
Duncan