I just moved from a nice headphone system to a speaker system. I had recabled AKG K701s powered by a Little Dot MKV, fed my an audio mirror D2 DAC.
Ya, they sounded good I suppose... a little harsh on the highs and lacking in bass though.
Now, once I moved to my speaker system... I was (and still am) blown away. Much greater sense of space and precise, accurate placement... much more balanced through the entire range.
My system now consists of Green Mountain Audio Continuum 1's, a modified Yamaha M-40, and again the Audio Mirror D2 DAC.
It's also great to not be tethered to a cord and to be able to share the music experience with others.
I'm in the speaker camp again now :).
So, I have a pristine pair of AKG K701s for sale if your interested. They are recabled with 5ft APureSound V3 cable, terminated with a Furutech FP-704 1/4" jack.
You can see pics here: http://www.head-fi.org/forums/f10/fs-akg-k701-w-apsv3-furutech-pristine-408388/
Take care.