The Corda Move does a very good job with the 701 .
Less air than DV337 and Cantate? Yes less soundstage too, but it still does a very good job.
The iBasso D3, however, seems incapable of driving the 701. There was so much distortion (clipping) I was worried about damaging the 701.
The sound was anemic , thin and the bass was a blur of distortion.
This was true of both high and low gain.
I was surprised , because with IEMs (Se530, Ety4s, earlier shures) and Yuin PK1 and 2 the D3 is an astonishing amp.
with these types of phones I like the D3 more than the Move.
gatto, I would recommend you buy the D3 and pair it with compatible phone for the office and you can then enjoy the great sound of the D3 with your Freqs.
Wait till you can buy a great home amp to go with the 701.
Or get the Meier Move which does drive the 701 quite well.
You can plug in the move as well and not worry about battery life.