What about the cable sensitivities of a typical 2V line-level out?
The reason I ask:
I'm powering my headphones out of the preamp out of my Devialet (seems thorougly goofy, but it has no headphone jack and this is actually recommended by Devilet themselves). The cable is a Blue Jeans Cable (Belden) MSA-1, with male RCA pair at one end and 1/4" female TRS at the other, 10 feet in length. Headphones used so far are HiFi Man HE-400i, AKG 7XX, and Senheiser 6XX. All seem to work more than fine so far.
But....the paranoid side of me is wondering if a 2V line out really has enough 'ooomph' to drive headphones, especially given the long 10' cable (plus whatever 4-6' length attached to the headphone itself).