Right now, I am powering my well-broken-in K702s with a Headroom MicroAmp. I'm pretty satisfied with the sound (but the bass extension seems limited) and the comfort of the headphones, which I use only for classical music. I've read some good reviews of the Burson amp. If you have heard the K702 or K701 with the Burson, how did you feel about the sound quality? And if you have by any chance used the 701/702 phones with the Headroom MicroAmp in addition to the Burson, how would you describe the difference in the results you heard?