I am on the verge of ordering a Grace Design m903 DAC/headphone amp to drive my AKG K702 headphones. They are rated at 62 ohms with a max power rating of 200 mW. The hf amp in the m903 has an output impedance of 1.2 ohm and has a max power output of about 1.2 watts @ 50 ohm and 600 mW at 100 ohm (250 ohm = 240 mW and 600 ohm = 100 mW). This seems like a good match impedance and power wise to make them perform properly. Does anyone have experience with this hf amp with K702s? Also I see that it has a cross feed circuit designed by Jan Meier. Do people who own this amp use this feature?