Rogue Sphinx 3 headphone amp question
I have a Sphinx 3 amp. When I play flax files through my bookshelf speakers the power is impressive. I turn the volume up to 4 or 5 and it plays very loud. When I plug in headphones I need volume at 8 to 9. I am using Beyerdynamic dt770 80ohms so they should not be too hard to drive. I was told maybe the cans are not efficient but I thought the 80ohms rating meant they should be easier to drive.
Does anyone with a sphinx have similar results?