The ATH-R70x is Audio-Technica's first pair of open-back reference professional headphones and feature specially designed drivers and acoustically transparent housings fashioned from aluminum honeycomb mesh.
Deducted a star for the garbage long cable. An aftermarket cable is definitely needed. Default cable is 3m.
Coming from the HD650 and paired with the warm Zen CAN + DAC combo, the HD650 sounded warm, smooth and frankly boring.
The R70x are a cheap upgrade soundwise. It adds the extra zing to vocals, "piercing the veil" to add a more well-rounded bass, and adding just a tiny amount of extra on the top and low end to improve on the HD650.
It's a balanced, flat sound with just a bit of extra on top and low. Highly recommended over the HD650.