I know the Hifiman HE-6 stands out as truly power hungry, as does the AKG K-1000, but are there headphones that go even beyond those? Headphones that have even lower sensitivity or ridiculously high impedance? I'm just asking out of pure curiosity :)

Hi. I'm constructing a headphone amplifier that's supposed to drive any pair of headphones, but I'm not sure of how powerful I actually need it to be. I'm currently getting about at least 1W output up to about 150Ohms which is enough to blow most headphone, but what about headphone with a higher...

Hi. I'm making a headphone amplifier with a 4-pin XLR output as well as a 6.35mm jack, but I don't know the pin-out of this connector, could someone help me out?

We are currently working on a project where the idea is to start a virtual business that manufacture and sell headphone amplifiers. Please respond to this quick survey if you have the time. The idea is to get a general idea of what needs we are actually trying to meet.  ...