WilCox
500+ Head-Fier
I'm very pleased with my WA2 driving my K702 -- plenty of power, control and bass extension. As a matter of fact, using the WA2, they are my favorite dynamic phones, second only to my Stax. Fresh out of the box, they sounded "lame" with any amp I tried. I'm not a big believer in break-in, but the K702 really changed after several hundred hours - for the better!