Following the advice of many French audiophile forums and Anglo-Saxon, I bought this Fiio Olympus E10K AKG Q701 to plug in my headphones on my Mac. Well, these tips were good, the result is really excellent. The Fiio is not only widely powerful enough to hold this demanding helmet, but mostly he corrects the small tend to miss low of AKG without sacrificing any of its beautiful medium / high, openness and clarity which are the signature. Baroque and sublime classic, detailed jazz, rock beats that vigorous electro. The bass rab possible by the small switch to pack finished the last recalcitrant pieces. In short, owners of AKG 701, do you ask more questions in this price range the Olympus Fiio E10K DAC is the ideal amp for your helmet.
ps: Little surprise, the Fiio is really tiny. That said, it seems very solid and well finished.