This morning I did another test using the Schiit Jotunheim on high gain. I was too tired last night to turn on my Windows PC or get behind the desk again to swap some cables around.
The differences in this test compared to the other three amps are I am using the Schiit multibit DAC module inside the Jotunheim and while playing the same tracks as yesterday, they are on my Windows box and through Foobar.
Still looking at the same things as before, noise floor and power here. With the Jotunheim I found that it had more power, or headroom, than the THX 789 and Darkvoice. Getting the volume level about the same was better at 55% to 60% on the knob compared to the 75% on the other two. There was no noticeable noise floor at all. That is unless I had no music playing, the amp on, and I turned the knob to 100%. Only then I could detect a faint hint of hiss. But for any practical sense of the measurement, there is no noise with the Jotunheim. The other thing was that the bass response was comparable to what I experienced with the THX 789.
So now with four amps tested on the DT880 600Ω I can, in my opinion, say that any decent amp on the market can power these headphones respectably. One doesn’t need a ‘page 11’ mod to enjoy these headphones. In fact, the Emotiva BasX A-100 is probably the poorest choice to pair with these headphones.