The DAC 2004 with volume control is perfectly suited for use with electrodynamic headphones from 250 Ohms upwards. For example, the legendary Sennheiser HD650. The original cable will not do because of its low quality and because of its connecting jack. The DAC 2004 has two XLR balanced outputs which should be used with headphones. The wiring schematic is as follows:
DAC output XLR pin 1:
DAC output XLR pin 2:
DAC output XLR pin 3:
The shield of the headphone cable is not to be connected at the headphone end. It should be left floating at the headphone end. The more you shield, the better it sounds.
We can add level to the standard DAC 2004 to accomodate the levels you'd like. Email us and we'll work out what's best for you.